Best Silent Air Conditioners of 2026

Last updated on 28/05/2026

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Pro Breeze 4-in-1 Portable Air Conditioner 9000 BTU - Smart Home WiFi, 24 hr Timer, Window Kit, Powerful Air Conditioning, Class A Energy Efficient AC Unit for Home & Office - WHICH? BEST BUY AC AWARD

Pro Breeze 4-in-1 Portable Air Conditioner 9000 BTU - Smart Home WiFi, 24 hr Timer, Window Kit, Powerful Air Conditioning, Class A Energy Efficient AC Unit for Home & Office - WHICH? BEST BUY AC AWARD

Pro Breeze

Why we love it

Powerful cooling capacity.
Smart home integration.
Energy-saving design.

Main Highlights

POWERFUL COOLING This portable air conditioner features 9000 BTU of cooling capacity, allowing for strong and effective cooling down to 16°C in medium to large homes, living rooms, bedrooms and offices
SMART HOME TECHNOLOGY WITH WI-FI: Connect your smartphone to the AC unit and control the air conditioners temperature, 24 hour timer and various air con functions through the app or voice command. Compatible with Amazon Alexa and Google Home for iPhone and Android.
4-IN-1 FEATURES WITH DIGITAL DISPLAY: This portable air conditioning unit features 4 multi-purpose operating modes including air cooling, dehumidifying, fan only and sleep modes all of which can be controlled via the air conditioner smart app, digital display or remote control.
ENERGY EFFICIENT AIR CONDITIONER: This A/C unit boasts a Class A Energy Efficiency rating to ensure that keeping cool in the sweltering summer heat is cost effective. It also utilises an R290 refrigerant, up to 690 times more eco-friendly than traditional air conditioning gasses.
WINDOW KITS INCLUDED: We have included two easy-to-install air conditioner window venting kits with our AC unit to fit either slide or hinged windows using the step by step instructions provided. Its space-saving design also ensures minimal intrusion.
WINNER OF THE WHICH? BEST BUY AWARD: Awarded the Which? Best Buy for Air Conditioners (December 2025) recognising top-tier performance, reliability, and value. Independently rated one of the best air conditioners on the market.

9.8

Exceptional

9.8

Exceptional

Pro Breeze

Pro Breeze 4-in-1 Portable Air Conditioner 9000 BTU - Smart Home WiFi, 24 hr Timer, Window Kit, Powerful Air Conditioning, Class A Energy Efficient AC Unit for Home & Office - WHICH? BEST BUY AC AWARD

Why we love it

Powerful cooling capacity.
Smart home integration.
Energy-saving design.

Main Highlights

POWERFUL COOLING This portable air conditioner features 9000 BTU of cooling capacity, allowing for strong and effective cooling down to 16°C in medium to large homes, living rooms, bedrooms and offices
SMART HOME TECHNOLOGY WITH WI-FI: Connect your smartphone to the AC unit and control the air conditioners temperature, 24 hour timer and various air con functions through the app or voice command. Compatible with Amazon Alexa and Google Home for iPhone and Android.
4-IN-1 FEATURES WITH DIGITAL DISPLAY: This portable air conditioning unit features 4 multi-purpose operating modes including air cooling, dehumidifying, fan only and sleep modes all of which can be controlled via the air conditioner smart app, digital display or remote control.
ENERGY EFFICIENT AIR CONDITIONER: This A/C unit boasts a Class A Energy Efficiency rating to ensure that keeping cool in the sweltering summer heat is cost effective. It also utilises an R290 refrigerant, up to 690 times more eco-friendly than traditional air conditioning gasses.
WINDOW KITS INCLUDED: We have included two easy-to-install air conditioner window venting kits with our AC unit to fit either slide or hinged windows using the step by step instructions provided. Its space-saving design also ensures minimal intrusion.
WINNER OF THE WHICH? BEST BUY AWARD: Awarded the Which? Best Buy for Air Conditioners (December 2025) recognising top-tier performance, reliability, and value. Independently rated one of the best air conditioners on the market.

Value for Money

DREO 10000 BTU Portable Air Conditioner, 3-in-1 Cool/Fan/Dry Quiet AC Unit for Bedroom/Office, Smart App/Voice/Remote Control, Drainage-Free, Universal Window Kit, 3.2L/H Dehumidification, AC515S

DREO 10000 BTU Portable Air Conditioner, 3-in-1 Cool/Fan/Dry Quiet AC Unit for Bedroom/Office, Smart App/Voice/Remote Control, Drainage-Free, Universal Window Kit, 3.2L/H Dehumidification, AC515S

DREO

Why we love it

Powerful 10,000 BTU cooling capacity.
Quiet operation for peaceful environments.
Smart control via voice assistants.

Main Highlights

𝗨𝗹𝘁𝗿𝗮 𝗣𝗼𝘄𝗲𝗿𝗳𝘂𝗹 𝗜𝗰𝗲𝗖𝗼𝗼𝗹 𝗦𝘆𝘀𝘁𝗲𝗺: Increase coverage up to 28㎡with this 10000 BTU（2.9kW） portable air conditioner and its best buddy, the fan, giving you instant chills even in hot summer days. Additionally, you can keep the temperature between 16℃ to 30℃ using various controls to tailor the cooling to your preferences.
𝗗𝗥𝗘𝗢'𝘀 𝗣𝗮𝘁𝗲𝗻𝘁𝗲𝗱 𝗡𝗼𝗶𝘀𝗲 𝗜𝘀𝗼𝗹𝗮𝘁𝗶𝗼𝗻 𝗦𝘆𝘀𝘁𝗲𝗺: reduces the ac floor unit compressor and turbulence noise to just 46dB(Sound Power 65dB), ideal for bedtime or working environments without interruptions.
𝗧𝗿𝘂𝗲 𝗗𝗿𝗮𝗶𝗻𝗮𝗴𝗲-𝗳𝗿𝗲𝗲 𝗦𝘆𝘀𝘁𝗲𝗺: DREO's patented algorithm, sensors and pump evaporate excess water automatically eliminating the need for drainage in environments of up to 90% humidity.
𝗦𝗺𝗮𝗿𝘁 𝗖𝗹𝗶𝗺𝗮𝘁𝗲 𝗖𝗼𝗻𝘁𝗿𝗼𝗹: Control this portable air conditioner for bedroom with your voice using Siri, Amazon Alexa and Google Home, or tailor your cooling experience by monitoring temp, humidity and customizing your sleep curve function through the DREO app.
𝟯-𝗶𝗻-𝟭 𝗩𝗲𝗿𝘀𝗮𝘁𝗶𝗹𝗲 𝗔𝗖 𝘂𝗻𝗶𝘁: You can not only choose from Cool/Fan/Dry modes this home air conditioner also has three functions to control within each mode, making it perfect for all scenario. It delivers an impressive dehumidification capacity of 3.2L/H to quickly remove moisture from the air and keep your space dry and comfortable.

DREO 10000 BTU Portable Air Conditioner, 3-in-1 Cool/Fan/Dry Quiet AC Unit for Bedroom/Office, Smart App/Voice/Remote Control, Drainage-Free, Universal Window Kit, 3.2L/H Dehumidification, AC515S

Why we love it

Powerful 10,000 BTU cooling capacity.
Quiet operation for peaceful environments.
Smart control via voice assistants.

Main Highlights

𝗨𝗹𝘁𝗿𝗮 𝗣𝗼𝘄𝗲𝗿𝗳𝘂𝗹 𝗜𝗰𝗲𝗖𝗼𝗼𝗹 𝗦𝘆𝘀𝘁𝗲𝗺: Increase coverage up to 28㎡with this 10000 BTU（2.9kW） portable air conditioner and its best buddy, the fan, giving you instant chills even in hot summer days. Additionally, you can keep the temperature between 16℃ to 30℃ using various controls to tailor the cooling to your preferences.
𝗗𝗥𝗘𝗢'𝘀 𝗣𝗮𝘁𝗲𝗻𝘁𝗲𝗱 𝗡𝗼𝗶𝘀𝗲 𝗜𝘀𝗼𝗹𝗮𝘁𝗶𝗼𝗻 𝗦𝘆𝘀𝘁𝗲𝗺: reduces the ac floor unit compressor and turbulence noise to just 46dB(Sound Power 65dB), ideal for bedtime or working environments without interruptions.
𝗧𝗿𝘂𝗲 𝗗𝗿𝗮𝗶𝗻𝗮𝗴𝗲-𝗳𝗿𝗲𝗲 𝗦𝘆𝘀𝘁𝗲𝗺: DREO's patented algorithm, sensors and pump evaporate excess water automatically eliminating the need for drainage in environments of up to 90% humidity.
𝗦𝗺𝗮𝗿𝘁 𝗖𝗹𝗶𝗺𝗮𝘁𝗲 𝗖𝗼𝗻𝘁𝗿𝗼𝗹: Control this portable air conditioner for bedroom with your voice using Siri, Amazon Alexa and Google Home, or tailor your cooling experience by monitoring temp, humidity and customizing your sleep curve function through the DREO app.
𝟯-𝗶𝗻-𝟭 𝗩𝗲𝗿𝘀𝗮𝘁𝗶𝗹𝗲 𝗔𝗖 𝘂𝗻𝗶𝘁: You can not only choose from Cool/Fan/Dry modes this home air conditioner also has three functions to control within each mode, making it perfect for all scenario. It delivers an impressive dehumidification capacity of 3.2L/H to quickly remove moisture from the air and keep your space dry and comfortable.

DREO 7500 BTU Portable Air Conditioner, 3-in-1 Cool/Fan/Dry Quiet AC Unit for Bedroom/Office, Smart App/Voice/Remote Control, Drainage-Free, Universal Window Kit, 2.5L/H Dehumidification, AC318S

DREO 7500 BTU Portable Air Conditioner, 3-in-1 Cool/Fan/Dry Quiet AC Unit for Bedroom/Office, Smart App/Voice/Remote Control, Drainage-Free, Universal Window Kit, 2.5L/H Dehumidification, AC318S

DREO

Why we love it

Powerful portable cooling.
Whisper-quiet operation.
Drainage-free humidity control.

Main Highlights

𝗨𝗹𝘁𝗿𝗮 𝗣𝗼𝘄𝗲𝗿𝗳𝘂𝗹 𝗜𝗰𝗲𝗖𝗼𝗼𝗹 𝗦𝘆𝘀𝘁𝗲𝗺: Increase coverage up to 20㎡ maximum area with this 7500 BTU（2.2kW） portable air conditioner and its best buddy, the fan, giving you instant chills even in hot summer days. Additionally, you can keep the temperature between 16℃ to 30℃ using various controls to tailor the cooling to your preferences.
𝗗𝗥𝗘𝗢'𝘀 𝗣𝗮𝘁𝗲𝗻𝘁𝗲𝗱 𝗡𝗼𝗶𝘀𝗲 𝗜𝘀𝗼𝗹𝗮𝘁𝗶𝗼𝗻 𝗦𝘆𝘀𝘁𝗲𝗺: reduces the ac floor unit compressor and turbulence noise to just 46dB(Sound Power 61dB), ideal for bedtime or working environments without interruptions.
𝗧𝗿𝘂𝗲 𝗗𝗿𝗮𝗶𝗻𝗮𝗴𝗲-𝗳𝗿𝗲𝗲 𝗦𝘆𝘀𝘁𝗲𝗺: DREO's patented algorithm, sensors and pump evaporate excess water automatically eliminating the need for drainage in environments of up to 90% humidity.
𝗦𝗺𝗮𝗿𝘁 𝗖𝗹𝗶𝗺𝗮𝘁𝗲 𝗖𝗼𝗻𝘁𝗿𝗼𝗹: Control this portable air conditioner for bedroom with your voice using Siri, Amazon Alexa and Google Home, or tailor your cooling experience by monitoring temp, humidity and customizing your sleep curve function through the DREO app.
𝟯-𝗶𝗻-𝟭 𝗩𝗲𝗿𝘀𝗮𝘁𝗶𝗹𝗲 𝗔𝗖 𝘂𝗻𝗶𝘁: You can not only choose from Cool/Fan/Dry modes this home air conditioner also has three functions to control within each mode, making it perfect for all scenario. It delivers an impressive dehumidification capacity of 2.5L/H to quickly remove moisture from the air and keep your space dry and comfortable.
𝐄𝐚𝐬𝐲 𝐭𝐨 𝐌𝐨𝐯𝐞 & 𝐔𝐬𝐞: This portable room air conditioner features smooth caster wheels for effortless movement between any room in your home. It comes with a 1.5m exhaust hose for drainage, and a magnetic remote control for convenient storage and instant access whenever you need it.
Universal Window Compatibility: Comes with 3 installation kits—sealing cloth for casement windows, panels for sliding windows, and wall-hole fittings. A center pivot window accessory is also available; contact DREO customers support for requests. 𝗦𝘂𝗽𝗲𝗿𝗯 𝗖𝘂𝘀𝘁𝗼𝗺𝗲𝗿 𝗦𝗲𝗿𝘃𝗶𝗰𝗲: DREO expert customer support works around the clock to help you and give all the product guidance needed when using our AC Series

DREO 7500 BTU Portable Air Conditioner, 3-in-1 Cool/Fan/Dry Quiet AC Unit for Bedroom/Office, Smart App/Voice/Remote Control, Drainage-Free, Universal Window Kit, 2.5L/H Dehumidification, AC318S

Why we love it

Powerful portable cooling.
Whisper-quiet operation.
Drainage-free humidity control.

Main Highlights

𝗨𝗹𝘁𝗿𝗮 𝗣𝗼𝘄𝗲𝗿𝗳𝘂𝗹 𝗜𝗰𝗲𝗖𝗼𝗼𝗹 𝗦𝘆𝘀𝘁𝗲𝗺: Increase coverage up to 20㎡ maximum area with this 7500 BTU（2.2kW） portable air conditioner and its best buddy, the fan, giving you instant chills even in hot summer days. Additionally, you can keep the temperature between 16℃ to 30℃ using various controls to tailor the cooling to your preferences.
𝗗𝗥𝗘𝗢'𝘀 𝗣𝗮𝘁𝗲𝗻𝘁𝗲𝗱 𝗡𝗼𝗶𝘀𝗲 𝗜𝘀𝗼𝗹𝗮𝘁𝗶𝗼𝗻 𝗦𝘆𝘀𝘁𝗲𝗺: reduces the ac floor unit compressor and turbulence noise to just 46dB(Sound Power 61dB), ideal for bedtime or working environments without interruptions.
𝗧𝗿𝘂𝗲 𝗗𝗿𝗮𝗶𝗻𝗮𝗴𝗲-𝗳𝗿𝗲𝗲 𝗦𝘆𝘀𝘁𝗲𝗺: DREO's patented algorithm, sensors and pump evaporate excess water automatically eliminating the need for drainage in environments of up to 90% humidity.
𝗦𝗺𝗮𝗿𝘁 𝗖𝗹𝗶𝗺𝗮𝘁𝗲 𝗖𝗼𝗻𝘁𝗿𝗼𝗹: Control this portable air conditioner for bedroom with your voice using Siri, Amazon Alexa and Google Home, or tailor your cooling experience by monitoring temp, humidity and customizing your sleep curve function through the DREO app.
𝟯-𝗶𝗻-𝟭 𝗩𝗲𝗿𝘀𝗮𝘁𝗶𝗹𝗲 𝗔𝗖 𝘂𝗻𝗶𝘁: You can not only choose from Cool/Fan/Dry modes this home air conditioner also has three functions to control within each mode, making it perfect for all scenario. It delivers an impressive dehumidification capacity of 2.5L/H to quickly remove moisture from the air and keep your space dry and comfortable.
𝐄𝐚𝐬𝐲 𝐭𝐨 𝐌𝐨𝐯𝐞 & 𝐔𝐬𝐞: This portable room air conditioner features smooth caster wheels for effortless movement between any room in your home. It comes with a 1.5m exhaust hose for drainage, and a magnetic remote control for convenient storage and instant access whenever you need it.
Universal Window Compatibility: Comes with 3 installation kits—sealing cloth for casement windows, panels for sliding windows, and wall-hole fittings. A center pivot window accessory is also available; contact DREO customers support for requests. 𝗦𝘂𝗽𝗲𝗿𝗯 𝗖𝘂𝘀𝘁𝗼𝗺𝗲𝗿 𝗦𝗲𝗿𝘃𝗶𝗰𝗲: DREO expert customer support works around the clock to help you and give all the product guidance needed when using our AC Series

LEENON Air Conditioning Unit 14000 BTU Portable Air Conditioner, Powerful 4-in-1 AC Conditioners Dehumidifier Fan & Sleep Mode, Aircon Unit with 24H Timer,Auto-Swing, Remote Control, Exhaust Hose

LEENON Air Conditioning Unit 14000 BTU Portable Air Conditioner, Powerful 4-in-1 AC Conditioners Dehumidifier Fan & Sleep Mode, Aircon Unit with 24H Timer,Auto-Swing, Remote Control, Exhaust Hose

LEENON

Why we love it

Hassle-free setup, no installation.
Cools fast in small spaces.
Energy efficient, lowers bills.

Main Highlights

14000 BTU Ultral-Powerful Cooling: Experience ultimate relief from scorching heat with the LEENON 14000 BTU air conditioning unit Utilizing advanced refrigeration compressor technology, providing a 55% boost over standard units. This portable air conditioner. delivers rapid, high-performance cooling for spaces up to 500 sq.ft,is great for home, kitchen,living room, office. Our air conditioner will beat the heat that drops the temperature to 16℃ even in the hot summer.
4-in-1 Modes & 3-Speed: LEENON portable air conditioner combines AC unnit, dehumidifier and fan/sleep mode functions. 1400O BTU upgraded power boosts aircon unit unit delivers rapid temperature drops to chill your room instantly. Continuous dehumidifier mode makes your room dry by removing excess moisture, the upgraded 3-speed strong fan mode (Low/Med/High) promotes air circulation for room. Quiet sleep mode operates at a low noise, providing a comfortable and undisturbed night's rest.
Easy Mobility & Hassle-Free Install: Despite its powerful 14000 BTU capacity, this LEENON aircon unit is designed for ultimate portability. It features four 360°swivel casters and ergonomic handles for easy movement between rooms. The washable air filter is easily removable for quick cleaning to maintain peak performance. Plus, our air conditioning includes a window seal kit and exhaust hose fitting most sliding or hung windows—no drilling required.
Auto-Swing & User-Friendly Operation: Enhance comfort with auto-swing funtion of air con, innovative 120°wide-angle oscillation moves louvers to distribute chilled air evenly. Use remote control or control panel to easily adjust 4 modes, 3 fan speeds and temperatures from 16 to 30 °etc. Features real-time temp tracking and a child lock for safety. Our portable air conditioning unit have a 24-hour timer function, which lets you schedule cooling times to stay cool and avoid wasting energy.
Smart Control & Self-Evaporation: LEENON 14000BTU airconditioning portable meets Class A energy efficiency standards. Air con unit uses R290 eco-friendly refrigerant. The built-in sensor saves energy by entering standby once reaches your set temperature, auto-restarting if it rises. Automatic evaporation technology enables recirculation of condensate, no need drainage during cooling mode. In dehu mode or high-humidity, it reduces the frequency of drainage (Continuous or manual drainage option).

LEENON Air Conditioning Unit 14000 BTU Portable Air Conditioner, Powerful 4-in-1 AC Conditioners Dehumidifier Fan & Sleep Mode, Aircon Unit with 24H Timer,Auto-Swing, Remote Control, Exhaust Hose

Why we love it

Hassle-free setup, no installation.
Cools fast in small spaces.
Energy efficient, lowers bills.

Main Highlights

14000 BTU Ultral-Powerful Cooling: Experience ultimate relief from scorching heat with the LEENON 14000 BTU air conditioning unit Utilizing advanced refrigeration compressor technology, providing a 55% boost over standard units. This portable air conditioner. delivers rapid, high-performance cooling for spaces up to 500 sq.ft,is great for home, kitchen,living room, office. Our air conditioner will beat the heat that drops the temperature to 16℃ even in the hot summer.
4-in-1 Modes & 3-Speed: LEENON portable air conditioner combines AC unnit, dehumidifier and fan/sleep mode functions. 1400O BTU upgraded power boosts aircon unit unit delivers rapid temperature drops to chill your room instantly. Continuous dehumidifier mode makes your room dry by removing excess moisture, the upgraded 3-speed strong fan mode (Low/Med/High) promotes air circulation for room. Quiet sleep mode operates at a low noise, providing a comfortable and undisturbed night's rest.
Easy Mobility & Hassle-Free Install: Despite its powerful 14000 BTU capacity, this LEENON aircon unit is designed for ultimate portability. It features four 360°swivel casters and ergonomic handles for easy movement between rooms. The washable air filter is easily removable for quick cleaning to maintain peak performance. Plus, our air conditioning includes a window seal kit and exhaust hose fitting most sliding or hung windows—no drilling required.
Auto-Swing & User-Friendly Operation: Enhance comfort with auto-swing funtion of air con, innovative 120°wide-angle oscillation moves louvers to distribute chilled air evenly. Use remote control or control panel to easily adjust 4 modes, 3 fan speeds and temperatures from 16 to 30 °etc. Features real-time temp tracking and a child lock for safety. Our portable air conditioning unit have a 24-hour timer function, which lets you schedule cooling times to stay cool and avoid wasting energy.
Smart Control & Self-Evaporation: LEENON 14000BTU airconditioning portable meets Class A energy efficiency standards. Air con unit uses R290 eco-friendly refrigerant. The built-in sensor saves energy by entering standby once reaches your set temperature, auto-restarting if it rises. Automatic evaporation technology enables recirculation of condensate, no need drainage during cooling mode. In dehu mode or high-humidity, it reduces the frequency of drainage (Continuous or manual drainage option).

BLU-09 9,000 BTU Portable Air Conditioner Portable 3-1 Air Conditioner, Dehumidifier, Cooling Fan with 3 Fan Speeds, Window Sheet for UK Windows, Digital Display & Remote Control

BLU-09 9,000 BTU Portable Air Conditioner Portable 3-1 Air Conditioner, Dehumidifier, Cooling Fan with 3 Fan Speeds, Window Sheet for UK Windows, Digital Display & Remote Control

BLU

Why we love it

Versatile 3-in-1 functionality.
Eco-friendly with R290 refrigerant.
Hassle-free installation.

Main Highlights

3-in-1 Multi Functional: Portable air conditioning unit with cooling, fan and dehumidifier function, complete with 1.5m expandable exhaust hose included. The BLU09 9,000 BTU portable air conditioner delivers an instant cooling relief for your home or work place. Suitable for rooms up to 20 square metres. The BLU09 does not have a heating function.
Complimentary Window Sheet for Casement Windows: Now supplied with a high quality window sheet that has been especially designed for UK Outward/Inward Opening Windows so there is no need to buy a separate window sheet.
R290 Refrigerant: Uses natural high efficiency R290 with zero greenhouse emissions. The natural refrigerant is non-toxic, eco friendly and also offers energy savings.
Self Evaporating Function: Reduces the need to regularly remove water. The unit recycles approximately half of the condensed water and uses it to cool off the inner cooling coils, which allows the unit to run more efficiently. It then disperses, or evaporates, the remaining water, along with the hot air, via the hot air duct. This cuts out any unnecessary water collecting inside the unit or in an outside container.
Easy to Set Up: Simply set up the hose kit provided, place out of the window opening, plug and play in a few simple steps. The complimentary window seal kit can be used with outward or inward opening UK casement windows to seal your space & prevent heat gains.
Additional Features for your Convenience: Window Sheet for Casement Windows, Remote Control with LED Display to switch between Modes, Set Temperature & View °F & °C. Louvers allow maximum cooling efficiency, easy-roll omnidirectional castors help you move your "BLU09CO" wherever it is needed most.
Sound Pressure Level: 49-53dBA. Sound Power Level: 62 - 64dBA. The sound pressure level is the pressure disturbance in the atmosphere measured using predefined conditions such as the location of the equipment and environmental conditions - the sound pressure is ultimately what our ears hear.
The BLU09 does not have a heating function as it is cooling only. Please note, the BLU09 should not be plugged into a multiway extension lead as this can result in a whiny noise. It can also affect the unit's performance. If you have to use an extension lead, please use a 1 gang heavy duty extension lead to ensure the unit can run effectively.

BLU-09 9,000 BTU Portable Air Conditioner Portable 3-1 Air Conditioner, Dehumidifier, Cooling Fan with 3 Fan Speeds, Window Sheet for UK Windows, Digital Display & Remote Control

Why we love it

Versatile 3-in-1 functionality.
Eco-friendly with R290 refrigerant.
Hassle-free installation.

Main Highlights

3-in-1 Multi Functional: Portable air conditioning unit with cooling, fan and dehumidifier function, complete with 1.5m expandable exhaust hose included. The BLU09 9,000 BTU portable air conditioner delivers an instant cooling relief for your home or work place. Suitable for rooms up to 20 square metres. The BLU09 does not have a heating function.
Complimentary Window Sheet for Casement Windows: Now supplied with a high quality window sheet that has been especially designed for UK Outward/Inward Opening Windows so there is no need to buy a separate window sheet.
R290 Refrigerant: Uses natural high efficiency R290 with zero greenhouse emissions. The natural refrigerant is non-toxic, eco friendly and also offers energy savings.
Self Evaporating Function: Reduces the need to regularly remove water. The unit recycles approximately half of the condensed water and uses it to cool off the inner cooling coils, which allows the unit to run more efficiently. It then disperses, or evaporates, the remaining water, along with the hot air, via the hot air duct. This cuts out any unnecessary water collecting inside the unit or in an outside container.
Easy to Set Up: Simply set up the hose kit provided, place out of the window opening, plug and play in a few simple steps. The complimentary window seal kit can be used with outward or inward opening UK casement windows to seal your space & prevent heat gains.
Additional Features for your Convenience: Window Sheet for Casement Windows, Remote Control with LED Display to switch between Modes, Set Temperature & View °F & °C. Louvers allow maximum cooling efficiency, easy-roll omnidirectional castors help you move your "BLU09CO" wherever it is needed most.
Sound Pressure Level: 49-53dBA. Sound Power Level: 62 - 64dBA. The sound pressure level is the pressure disturbance in the atmosphere measured using predefined conditions such as the location of the equipment and environmental conditions - the sound pressure is ultimately what our ears hear.
The BLU09 does not have a heating function as it is cooling only. Please note, the BLU09 should not be plugged into a multiway extension lead as this can result in a whiny noise. It can also affect the unit's performance. If you have to use an extension lead, please use a 1 gang heavy duty extension lead to ensure the unit can run effectively.

Bosch Cool 4000 Portable AC - 3-in-1 Air Conditioner, Dehumidifier, Fan - 2.6 kW for rooms up to 35m² - Features Auto Mode, Silent Mode & Sleep Mode

Bosch Cool 4000 Portable AC - 3-in-1 Air Conditioner, Dehumidifier, Fan - 2.6 kW for rooms up to 35m² - Features Auto Mode, Silent Mode & Sleep Mode

Bosch Thermotechnik

Why we love it

Modern clever design.
Energy-efficient cooling.
Easy transport control.

Main Highlights

Simply Comfortable: Three integrated functions (cooling, dehumidifying and ventilation) ensure pleasant air quality with three speed settings, supporting a balanced climate in your home throughout the year
Simply Powerful & Quiet: 2.6 kW cooling power for rooms up to 88 m³ (approximately 35 m²), energy efficiency class A and a sound pressure level of 46–51 dB(A) ensure reliable and economical operation
Bosch Easy Cool Select: Thanks to the pre-programmed modes (Auto Mode, Silent Mode, Sleep Mode), you can choose the right setting for your daily activities with just one click
Simply Flexible: With integrated handles, smooth-running wheels, compact design, and intuitive touch display, transporting between different rooms is easy, and operation as well as storage are particularly comfortable
Simply Safe: The window kit and integrated exhaust hose allow for quick installation, while the automatic shut-off function and overheating protection ensure safe operation

Bosch Cool 4000 Portable AC - 3-in-1 Air Conditioner, Dehumidifier, Fan - 2.6 kW for rooms up to 35m² - Features Auto Mode, Silent Mode & Sleep Mode

Why we love it

Modern clever design.
Energy-efficient cooling.
Easy transport control.

Main Highlights

Simply Comfortable: Three integrated functions (cooling, dehumidifying and ventilation) ensure pleasant air quality with three speed settings, supporting a balanced climate in your home throughout the year
Simply Powerful & Quiet: 2.6 kW cooling power for rooms up to 88 m³ (approximately 35 m²), energy efficiency class A and a sound pressure level of 46–51 dB(A) ensure reliable and economical operation
Bosch Easy Cool Select: Thanks to the pre-programmed modes (Auto Mode, Silent Mode, Sleep Mode), you can choose the right setting for your daily activities with just one click
Simply Flexible: With integrated handles, smooth-running wheels, compact design, and intuitive touch display, transporting between different rooms is easy, and operation as well as storage are particularly comfortable
Simply Safe: The window kit and integrated exhaust hose allow for quick installation, while the automatic shut-off function and overheating protection ensure safe operation

Air Conditioning Unit - Portable Air Conditioner 9000 BTU, 4-in-1 Energy Efficient Cooling & Dehumidifier, Quiet Operation, Digital Display, Window Kit, 24-Hour Timer, Covers Up to 215 sq.ft (20㎡)

Air Conditioning Unit - Portable Air Conditioner 9000 BTU, 4-in-1 Energy Efficient Cooling & Dehumidifier, Quiet Operation, Digital Display, Window Kit, 24-Hour Timer, Covers Up to 215 sq.ft (20㎡)

EUHOMY

Why we love it

Versatile year-round climate control.
Whisper-quiet energy-efficient operation.
Easy to move and install.

Main Highlights

🌀【4-IN-1 MULTIFUNCTIONAL DESIGN】: This portable air conditioning unit integrates cooling, dehumidifying, fan, and sleep modes to meet year-round needs. With 2 fan speeds, it ensures optimal comfort in various environments. Whether it's a hot summer or a humid rainy season, this air conditioner can handle it all with ease, providing a comfortable indoor climate whenever you need it.
🌍【ENERGY-EFFICIENT & ULTRA-QUIET OPERATION】: Powered by a GMCC compressor, this portable air conditioner operates at a noise level as low as 52dB, making it perfect for bedrooms and offices. The R290 eco-friendly refrigerant and Class A energy efficiency rating not only reduce environmental impact but also help you save on electricity costs, making it a smart and sustainable choice.
🎮【SMART CONTROL & USER-FRIENDLY OPERATION】: Featuring an LED display and remote control, this air conditioning unit portable allows you to easily adjust the temperature (16-32℃), set the 24-hour timer, and monitor the water-full indicator. The child lock function ensures the safety of children and pets, making it a reliable and family-friendly appliance.
🏡【EASY INSTALLATION & EFFORTLESS MOBILITY】: Designed with built-in handles and 360° casters, this portable AC air conditioner can be moved effortlessly between rooms. The included window kit is compatible with horizontal and vertical sliding windows (17"-53"), enabling quick and tool-free installation. Whether it's your living room, bedroom, or office, this unit adapts seamlessly to different spaces, providing cooling wherever you need it.
💎【2025 UPGRADED DESIGN WITH STYLISH LOOK】: This air conditioner unit portable features a sleek, upgraded design with ABS frosted plastic for a premium feel. The intuitive control panel and clear display enhance usability, while the powerful airflow of 330m³/h ensures rapid cooling for rooms up to 20㎡. Enjoy a comfortable and refreshing environment in no time with this modern and efficient cooling solution.

Air Conditioning Unit - Portable Air Conditioner 9000 BTU, 4-in-1 Energy Efficient Cooling & Dehumidifier, Quiet Operation, Digital Display, Window Kit, 24-Hour Timer, Covers Up to 215 sq.ft (20㎡)

Why we love it

Versatile year-round climate control.
Whisper-quiet energy-efficient operation.
Easy to move and install.

Main Highlights

🌀【4-IN-1 MULTIFUNCTIONAL DESIGN】: This portable air conditioning unit integrates cooling, dehumidifying, fan, and sleep modes to meet year-round needs. With 2 fan speeds, it ensures optimal comfort in various environments. Whether it's a hot summer or a humid rainy season, this air conditioner can handle it all with ease, providing a comfortable indoor climate whenever you need it.
🌍【ENERGY-EFFICIENT & ULTRA-QUIET OPERATION】: Powered by a GMCC compressor, this portable air conditioner operates at a noise level as low as 52dB, making it perfect for bedrooms and offices. The R290 eco-friendly refrigerant and Class A energy efficiency rating not only reduce environmental impact but also help you save on electricity costs, making it a smart and sustainable choice.
🎮【SMART CONTROL & USER-FRIENDLY OPERATION】: Featuring an LED display and remote control, this air conditioning unit portable allows you to easily adjust the temperature (16-32℃), set the 24-hour timer, and monitor the water-full indicator. The child lock function ensures the safety of children and pets, making it a reliable and family-friendly appliance.
🏡【EASY INSTALLATION & EFFORTLESS MOBILITY】: Designed with built-in handles and 360° casters, this portable AC air conditioner can be moved effortlessly between rooms. The included window kit is compatible with horizontal and vertical sliding windows (17"-53"), enabling quick and tool-free installation. Whether it's your living room, bedroom, or office, this unit adapts seamlessly to different spaces, providing cooling wherever you need it.
💎【2025 UPGRADED DESIGN WITH STYLISH LOOK】: This air conditioner unit portable features a sleek, upgraded design with ABS frosted plastic for a premium feel. The intuitive control panel and clear display enhance usability, while the powerful airflow of 330m³/h ensures rapid cooling for rooms up to 20㎡. Enjoy a comfortable and refreshing environment in no time with this modern and efficient cooling solution.

AirOrig Portable Air Conditioner, 9000 BTU Air Conditioning Unit with Cooling, Fan, Dehumidifier & Sleep Mode, Air Conditioners with Window Kit and 24H Timer for Home Bedroom Office

AirOrig Portable Air Conditioner, 9000 BTU Air Conditioning Unit with Cooling, Fan, Dehumidifier & Sleep Mode, Air Conditioners with Window Kit and 24H Timer for Home Bedroom Office

AirOrig

Why we love it

Powerful cooling for spaces.
Versatile modes for comfort.
Quiet, portable and simple.

Main Highlights

Powerful Cooling Performance: With a cooling capacity of 9,000 BTU, this portable air conditioner features a robust compressor and centrifugal fan delivering an airflow of 340 m³/h to cover areas up to 30 m². The powerful cooling system rapidly brings down the temperature in your space.
Versatile design: Cooling, fan, and dehumidifier modes in one unit. Cool mode beats the heat fast; fan mode offers two speeds; dehumidifier mode tackles excess moisture and improve air quality.
Timer & Memory: Runs quietly at 55 dB—won't disturb your sleep. Set the 24-hour timer to auto shut off and save energy. If the power cuts out, the unit memorises your settings and resumes automatically when power returns.
Effortless Portability: Mobile air conditioners fitted with smooth-castoring wheels and ergonomic handles on both sides, this unit measures just 29 × 30 × 67 cm and weighs only 22 kg. Move it effortlessly between rooms—the living room, bedroom, or study—wherever you need it most.
Remote Control & Child Lock: Control your air conditioner from up to 4 metres away—perfect for adjusting settings without leaving the sofa or bed. The built-in child lock prevents little fingers from accidentally changing your settings.
Quick & Easy Installation: Quick and easy to install: This kit includes components suitable for both sliding windows and sash windows, fitting most standard windows, and can be installed in just five minutes.The classic white and black colour scheme complements any room style effortlessly.
Dedicated Customer Support: Enjoy complete peace of mind with a full 1-year warranty. Our team responds to all enquiries within 8 hours, ensuring quick resolution for any quality concerns. From purchase to everyday use, we're here to help.

AirOrig Portable Air Conditioner, 9000 BTU Air Conditioning Unit with Cooling, Fan, Dehumidifier & Sleep Mode, Air Conditioners with Window Kit and 24H Timer for Home Bedroom Office

Why we love it

Powerful cooling for spaces.
Versatile modes for comfort.
Quiet, portable and simple.

Main Highlights

Powerful Cooling Performance: With a cooling capacity of 9,000 BTU, this portable air conditioner features a robust compressor and centrifugal fan delivering an airflow of 340 m³/h to cover areas up to 30 m². The powerful cooling system rapidly brings down the temperature in your space.
Versatile design: Cooling, fan, and dehumidifier modes in one unit. Cool mode beats the heat fast; fan mode offers two speeds; dehumidifier mode tackles excess moisture and improve air quality.
Timer & Memory: Runs quietly at 55 dB—won't disturb your sleep. Set the 24-hour timer to auto shut off and save energy. If the power cuts out, the unit memorises your settings and resumes automatically when power returns.
Effortless Portability: Mobile air conditioners fitted with smooth-castoring wheels and ergonomic handles on both sides, this unit measures just 29 × 30 × 67 cm and weighs only 22 kg. Move it effortlessly between rooms—the living room, bedroom, or study—wherever you need it most.
Remote Control & Child Lock: Control your air conditioner from up to 4 metres away—perfect for adjusting settings without leaving the sofa or bed. The built-in child lock prevents little fingers from accidentally changing your settings.
Quick & Easy Installation: Quick and easy to install: This kit includes components suitable for both sliding windows and sash windows, fitting most standard windows, and can be installed in just five minutes.The classic white and black colour scheme complements any room style effortlessly.
Dedicated Customer Support: Enjoy complete peace of mind with a full 1-year warranty. Our team responds to all enquiries within 8 hours, ensuring quick resolution for any quality concerns. From purchase to everyday use, we're here to help.

Belaco Air Conditioning Unit 9000 BTU, Portable Air Conditioner, AC 4-in-1 Cooling, Fan & Dehumidifier, Energy Class A, Timer, Window Kit, Good Housekeeping Institute Approved

Belaco Air Conditioning Unit 9000 BTU, Portable Air Conditioner, AC 4-in-1 Cooling, Fan & Dehumidifier, Energy Class A, Timer, Window Kit, Good Housekeeping Institute Approved

Belaco

Why we love it

Cooling efficiency up to 9000BTU.
Versatile 4-in-1 functionality.
Eco-friendly R290 refrigerant.

Main Highlights

Powerful 9000 BTU Cooling: Efficiently cools bedrooms, living rooms, and offices with fast, consistent performance – ideal for UK homes and summer heatwaves.
Good Housekeeping Institute Approved: Tested and approved by the Good Housekeeping Institute for quality, performance, and reliability you can trust.
4-in-1 Multi-Function AC Unit: Air conditioner, fan, and dehumidifier in one compact unit – perfect for year-round comfort and humidity control.
Energy Class A Efficiency: Save on energy bills with high-efficiency cooling while maintaining powerful airflow and performance.
Remote Control & 24Hr Timer: Easily adjust temperature, modes, and schedules with a convenient remote control and programmable timer.
Portable & Easy Installation: Includes dual window kit for quick setup – no permanent installation required, move room to room effortlessly.
Built-in Dehumidifier Function: Removes excess moisture, helping prevent damp and improving indoor air quality.
Quiet & User-Friendly Design: Low noise operation makes it ideal for bedrooms, offices, and night-time use without disturbance.

Belaco Air Conditioning Unit 9000 BTU, Portable Air Conditioner, AC 4-in-1 Cooling, Fan & Dehumidifier, Energy Class A, Timer, Window Kit, Good Housekeeping Institute Approved

Why we love it

Cooling efficiency up to 9000BTU.
Versatile 4-in-1 functionality.
Eco-friendly R290 refrigerant.

Main Highlights

Powerful 9000 BTU Cooling: Efficiently cools bedrooms, living rooms, and offices with fast, consistent performance – ideal for UK homes and summer heatwaves.
Good Housekeeping Institute Approved: Tested and approved by the Good Housekeeping Institute for quality, performance, and reliability you can trust.
4-in-1 Multi-Function AC Unit: Air conditioner, fan, and dehumidifier in one compact unit – perfect for year-round comfort and humidity control.
Energy Class A Efficiency: Save on energy bills with high-efficiency cooling while maintaining powerful airflow and performance.
Remote Control & 24Hr Timer: Easily adjust temperature, modes, and schedules with a convenient remote control and programmable timer.
Portable & Easy Installation: Includes dual window kit for quick setup – no permanent installation required, move room to room effortlessly.
Built-in Dehumidifier Function: Removes excess moisture, helping prevent damp and improving indoor air quality.
Quiet & User-Friendly Design: Low noise operation makes it ideal for bedrooms, offices, and night-time use without disturbance.

Air Conditioning Unit, Portable Air Conditioner with 4-in-1 Cooling & Fan & Dehumidifier & Sleep Mode Function, Air Conditioners with Digital Display & Remote Control, 24H Timer for Room up to 215 ft

Air Conditioning Unit, Portable Air Conditioner with 4-in-1 Cooling & Fan & Dehumidifier & Sleep Mode Function, Air Conditioners with Digital Display & Remote Control, 24H Timer for Room up to 215 ft

JYMIPA

Why we love it

Powerful cooling in minutes.
Real-time temperature adjustment.
Customizable cooling experiences.

Main Highlights

Powerful 7000 Btu Cooling: This air conditioning unit utilizes an advanced air compressor, delivering powerful cooling with 7000 BTU capacity, suitable for rooms up to 215 square feet. Whether it's your home, bedroom, basement, office, living room, or kitchen, it ensures powerful and efficient cooling. In the scorching summer, it can quickly cool down the temperature to 16°C within 10 minutes, keeping you cool and comfortable. It is an essential tool to beat the heat
Real-Time Display And Remote Control: Equipped with a multifunctional control panel featuring an LED digital display and comprehensive remote control, this air conditioner portable offers real-time temperature monitoring and remote operation, enhancing the convenience of your lifestyle. With the remote control, you can effortlessly set timers, adjust temperature settings, and switch between modes for an unparalleled cooling experience
4-in-1 Multifunctional: Our 4-in-1 multifunctional portable ac air conditioner includes air cooling, fan, dehumidification, and sleep mode, meeting the varying needs of each season. In hot weather, the cooling mode provides refreshing relief; the fan mode offers gentle or powerful airflow; the dehumidification mode effectively removes moisture from the air, while the sleep mode ensures you have a quiet and undisturbed night
Portable And Hassle-Free Installation: With its space-saving design and durable omnidirectional casters, along with invisible side handles, this air conditioning enables effortless mobility from one room to another. Our air conditioner comes with an easy-to-install window kit compatible with most sliding windows and requires no drilling for even more convenient installation. The plug storage area on the back is designed to make storage or moving more convenient
Humanized Design: 24-hour on/off timer offers customizable cooling schedules for both day and night, helping you save energy. The thoughtful sleep mode dims the LED lights and reduces noise, providing a quiet and comfortable sleeping environment. For families with infants or pets, the child lock function ensures worry-free use

Air Conditioning Unit, Portable Air Conditioner with 4-in-1 Cooling & Fan & Dehumidifier & Sleep Mode Function, Air Conditioners with Digital Display & Remote Control, 24H Timer for Room up to 215 ft

Why we love it

Powerful cooling in minutes.
Real-time temperature adjustment.
Customizable cooling experiences.

Main Highlights

Powerful 7000 Btu Cooling: This air conditioning unit utilizes an advanced air compressor, delivering powerful cooling with 7000 BTU capacity, suitable for rooms up to 215 square feet. Whether it's your home, bedroom, basement, office, living room, or kitchen, it ensures powerful and efficient cooling. In the scorching summer, it can quickly cool down the temperature to 16°C within 10 minutes, keeping you cool and comfortable. It is an essential tool to beat the heat
Real-Time Display And Remote Control: Equipped with a multifunctional control panel featuring an LED digital display and comprehensive remote control, this air conditioner portable offers real-time temperature monitoring and remote operation, enhancing the convenience of your lifestyle. With the remote control, you can effortlessly set timers, adjust temperature settings, and switch between modes for an unparalleled cooling experience
4-in-1 Multifunctional: Our 4-in-1 multifunctional portable ac air conditioner includes air cooling, fan, dehumidification, and sleep mode, meeting the varying needs of each season. In hot weather, the cooling mode provides refreshing relief; the fan mode offers gentle or powerful airflow; the dehumidification mode effectively removes moisture from the air, while the sleep mode ensures you have a quiet and undisturbed night
Portable And Hassle-Free Installation: With its space-saving design and durable omnidirectional casters, along with invisible side handles, this air conditioning enables effortless mobility from one room to another. Our air conditioner comes with an easy-to-install window kit compatible with most sliding windows and requires no drilling for even more convenient installation. The plug storage area on the back is designed to make storage or moving more convenient
Humanized Design: 24-hour on/off timer offers customizable cooling schedules for both day and night, helping you save energy. The thoughtful sleep mode dims the LED lights and reduces noise, providing a quiet and comfortable sleeping environment. For families with infants or pets, the child lock function ensures worry-free use

We scanned 831 products

We reviewed these offers relevant to the Silent Air Conditioners within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Pro Breeze, DREO, LEENON, BLU, Bosch Thermotechnik, EUHOMY, AirOrig, Belaco, JYMIPA, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Silent Air Conditioners in the market, we considered we took a deep dive into 4156 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Pro Breeze 4-in-1 Portable Air Conditioner 9000 BTU - Smart Home WiFi, 24 hr Timer, Window Kit, Powerful Air Conditioning, Class A Energy Efficient AC Unit for Home & Office - WHICH? BEST BUY AC AWARD. We love many things about this product by Pro Breeze. What sets it apart from the competition is Powerful cooling capacity, Smart home integration, Energy-saving design.
The best value product for most shoppers and where user satisfaction is continuously the highest is DREO 10000 BTU Portable Air Conditioner, 3-in-1 Cool/Fan/Dry Quiet AC Unit for Bedroom/Office, Smart App/Voice/Remote Control, Drainage-Free, Universal Window Kit, 3.2L/H Dehumidification, AC515S by DREO based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Silent Air Conditioners and the best cost-to-value ratio is Air Conditioning Unit, Portable Air Conditioner with 4-in-1 Cooling & Fan & Dehumidifier & Sleep Mode Function, Air Conditioners with Digital Display & Remote Control, 24H Timer for Room up to 215 ftat JYMIPA with a % discount.
Our list of the best Silent Air Conditioners is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.