10 Best the Most Energy Efficient Air Conditioner in the UK 2025
Updated on 25/07/2025
#1
Recommended
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- Uses eco-friendly propane R290 gas with no greenhouse emissions
- Provides maximum cooling of 11,500 BTU, ensuring extensive coverage and energy efficiency
- Features a 12-hour digital timer and thermostat with Real Feel technology for precise temperature control
- Equipped with an LED display for real-time comfort status updates
- Operates quietly at 49-53 dB(A), minimizing sound disturbances with effective insulation
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- Uses eco-friendly propane R290 gas with no greenhouse emissions
- Provides maximum cooling of 11,500 BTU, ensuring extensive coverage and energy efficiency
- Features a 12-hour digital timer and thermostat with Real Feel technology for precise temperature control
- Equipped with an LED display for real-time comfort status updates
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#2
Value for Money
4% Off
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- Cooling capacity of 12000 BTU suitable for rooms up to 550 sq ft (50m2) with a temperature range of 16-31℃.
- Offers three modes: Cooling, Fan, and Dehumidifier, with dehumidification removing up to 1.2L of moisture per hour and vertical air circulation available.
- Operates quietly at 54 decibels, includes a 24-hour programmable timer for energy efficiency and convenience.
- Compact design with caster wheels and side handles for easy mobility, includes a washable air filter for maintenance.
- Comes with adjustable window venting kits for different window types and an easy-to-use remote control.
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- Cooling capacity of 12000 BTU suitable for rooms up to 550 sq ft (50m2) with a temperature range of 16-31℃.
- Offers three modes: Cooling, Fan, and Dehumidifier, with dehumidification removing up to 1.2L of moisture per hour and vertical air circulation available.
- Operates quietly at 54 decibels, includes a 24-hour programmable timer for energy efficiency and convenience.
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#3
29% Off
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- Direct cooling design targeted towards individuals rather than entire rooms, recommended to keep windows open for optimal airflow.
- No venting required for operation; simply plug in for portable and efficient cooling, designed for convenience and energy efficiency.
- Quieter operation at 50dB with a dual centrifugal fanning system and 3D oscillation for effective circulation of cooled air across a wide area.
- Versatile functionality with cooling, dehumidifying, and fan modes to enhance comfort.
- Easy operation with a touch screen and remote control, featuring adjustable settings and a child lock for safety.
- Additional comfort features include a 2-meter cooling radius, easy-to-clean detachable filter, and ambient lighting for a relaxing atmosphere.
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- Direct cooling design targeted towards individuals rather than entire rooms, recommended to keep windows open for optimal airflow.
- No venting required for operation; simply plug in for portable and efficient cooling, designed for convenience and energy efficiency.
- Quieter operation at 50dB with a dual centrifugal fanning system and 3D oscillation for effective circulation of cooled air across a wide area.
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#4
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- 3-in-1 functionality includes cooling, dehumidifying, and fan modes for versatile year-round use.
- Sleep Mode minimizes fan noise and maintains a comfortable temperature for undisturbed rest.
- Energy Efficiency Class A rating ensures effective cooling while saving on energy costs; features auto-restart after power outages.
- Compact size: 318mm (W) x 329mm (H) x 634mm (D), suitable for various room types; includes a 3-year manufacturer's warranty.
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- 3-in-1 functionality includes cooling, dehumidifying, and fan modes for versatile year-round use.
- Sleep Mode minimizes fan noise and maintains a comfortable temperature for undisturbed rest.
- Energy Efficiency Class A rating ensures effective cooling while saving on energy costs; features auto-restart after power outages.
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#5
3% Off
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- 4-in-1 functionality combines cooling, dehumidifying, fan, and sleep modes for year-round use with two adjustable fan speeds.
- Operates quietly at 52dB and uses eco-friendly R290 refrigerant, optimizing energy efficiency and reducing electricity costs.
- Equipped with an LED display and remote control for easy temperature adjustment (16-32℃), 24-hour timer programming, and a child lock for safety.
- Features ergonomic handles and 360° casters for easy mobility; includes a window kit for quick installation in various window types (17"-53").
- Modern design with ABS frosted plastic, user-friendly control panel, and strong airflow capacity (330m³/h) suitable for spaces up to 20㎡.
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- 4-in-1 functionality combines cooling, dehumidifying, fan, and sleep modes for year-round use with two adjustable fan speeds.
- Operates quietly at 52dB and uses eco-friendly R290 refrigerant, optimizing energy efficiency and reducing electricity costs.
- Equipped with an LED display and remote control for easy temperature adjustment (16-32℃), 24-hour timer programming, and a child lock for safety.
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#6
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- Cooling mode effectively lowers room temperature; Fan mode offers strong airflow; Dehumidification mode maintains humidity levels around 50%; Silent mode provides quiet operation.
- Compact design fits easily into various spaces, including living rooms and kitchens; Night sleep mode ensures low fan speed for quiet cooling while you rest.
- Versatile 4-in-1 unit functions as an air conditioner, ventilator, dehumidifier, and cooling system, enhancing air circulation and reducing indoor temperature quickly.
- Simple installation with a dual window kit; suitable for most window types, making it accessible for all users regardless of experience level.
- LED display shows current room temperature; Remote control functionality adds convenience for adjusting settings from a distance.
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- Cooling mode effectively lowers room temperature; Fan mode offers strong airflow; Dehumidification mode maintains humidity levels around 50%; Silent mode provides quiet operation.
- Compact design fits easily into various spaces, including living rooms and kitchens; Night sleep mode ensures low fan speed for quiet cooling while you rest.
- Versatile 4-in-1 unit functions as an air conditioner, ventilator, dehumidifier, and cooling system, enhancing air circulation and reducing indoor temperature quickly.
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#7
12% Off
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- 16,000BTU portable air conditioner and heater suitable for large rooms (30m² to 35m²)
- Class A energy efficiency with low noise operation (51.5dB) for a comfortable environment
- Includes remote control and digital display for easy temperature adjustments
- Standard and flexible window kits included for versatile installation
- Two-year warranty covering parts and labor from a reputable manufacturer
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- 16,000BTU portable air conditioner and heater suitable for large rooms (30m² to 35m²)
- Class A energy efficiency with low noise operation (51.5dB) for a comfortable environment
- Includes remote control and digital display for easy temperature adjustments
- Standard and flexible window kits included for versatile installation
- Two-year warranty covering parts and labor from a reputable manufacturer
#8
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- Portable air conditioning unit offering three functions: cooling, fan, and dehumidifier, suitable for rooms up to 20 square meters.
- Includes a specially designed window sheet for UK outward/inward opening windows, eliminating the need for a separate purchase.
- Utilizes R290 refrigerant, a natural and energy-efficient gas with no greenhouse emissions, making it eco-friendly.
- Features a self-evaporating system that reduces water removal needs by recycling condensed water for internal cooling.
- Simple setup with a hose kit compatible with UK window openings, ensuring effective sealing to prevent heat ingress.
- Equipped with a remote control for easy mode switching, temperature setting, and noise levels ranging from 49 to 53 dB(A), supporting convenient mobility with castors.
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- Portable air conditioning unit offering three functions: cooling, fan, and dehumidifier, suitable for rooms up to 20 square meters.
- Includes a specially designed window sheet for UK outward/inward opening windows, eliminating the need for a separate purchase.
- Utilizes R290 refrigerant, a natural and energy-efficient gas with no greenhouse emissions, making it eco-friendly.
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#9
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- Portable air conditioner with cooling capacity of up to 12000BTU for spaces up to 400 square feet; includes 8500BTU heating for warmth.
- Multi-functional unit: air conditioning, fan, dehumidifier, heater, and sleep mode; adjustable temperature range of 61-88°F (16-31°C) and two-speed fan settings.
- Operable via touch panel, remote control, or smartphone app; includes 1-hour timer and sleep mode for convenience.
- Compact dimensions (35.60cm x 34.50cm x 70.60cm) and lightweight for easy installation and movement; equipped with wheels and side handle.
- Window installation accessories included for easy setup without drilling; suitable for various window types and customer support available for defects.
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- Portable air conditioner with cooling capacity of up to 12000BTU for spaces up to 400 square feet; includes 8500BTU heating for warmth.
- Multi-functional unit: air conditioning, fan, dehumidifier, heater, and sleep mode; adjustable temperature range of 61-88°F (16-31°C) and two-speed fan settings.
- Operable via touch panel, remote control, or smartphone app; includes 1-hour timer and sleep mode for convenience.
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#10
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- 9000 BTU cooling capacity designed for spaces up to 450 sq.ft with efficient airflow (290 CMH) for quick cooling.
- Combines four functions: cooling, dehumidifying, fan, and automatic swing mode for enhanced air circulation and humidity control.
- Equipped with a remote control for easy temperature, timer, and mode adjustments, including switchable °C/°F settings.
- Compact and portable design with built-in handles and a window kit for easy movement and hassle-free installation without drilling.
- Features a 24-hour timer for pre-cooling and energy savings, alongside quiet operation for minimal disruption during sleep or work.
- Includes a complete accessory kit for simple setup, comprising an exhaust hose, hose connector, window kit adapter, remote control, and drain hose.
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- 9000 BTU cooling capacity designed for spaces up to 450 sq.ft with efficient airflow (290 CMH) for quick cooling.
- Combines four functions: cooling, dehumidifying, fan, and automatic swing mode for enhanced air circulation and humidity control.
- Equipped with a remote control for easy temperature, timer, and mode adjustments, including switchable °C/°F settings.
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