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Which Air Conditioner Brands Are Energy Efficient Comparison - May 2026

6 Best Which Air Conditioner Brands Are Energy Efficient In the UK

1
Best Choice
9.8Exceptional
2
9.7Exceptional
3
9.6Exceptional
4
Best Value
9.4Excellent
5
9.3Excellent
6
9.2Excellent
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Model

Pro Breeze 4-in-1 Portable Air Conditioner 7000 BTU with Remote Control, 24 Hour Timer & Dual Window Venting Kit Included. Powerful Air Conditioning Unit with Class A Energy Efficiency Rating
Model
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
Model
De'Longhi Pinguino Compact PACES72 Classic Compact Portable 8,300 BTU Air Conditioner, 3 in 1 Air Conditioning Unit, Rooms up to 60m³, A Energy Efficiency, Window Kit Included, Energy Class A, White
Model
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㎡)
Model
HOMCOM 8000 BTU 4-In-1 Portable Air Conditioner Unit Cooling Dehumidifying Ventilating for Room up to 27m², with Fan, Remote, 24H Timer, Window Mount Kit, R290, A Energy Efficiency
Model
9000 BTU Portable Air Conditioner, 3-in-1 AC Unit with Cooling, Dehumidifier, Fan, 2 Speeds, 24H Timer, Sleep Mode, Quiet, Remote, Window Kit for Home & Office Up to 300sq.ft [Energy Class a]

Brand

Pro Breeze
Brand
Pro Breeze
Brand
De'Longhi
Brand
EUHOMY
Brand
HOMCOM
Brand
Lidzopas

Reviews

11,908 reviews
Reviews
8,988 reviews
Reviews
1,300 reviews
Reviews
640 reviews
Reviews
984 reviews
Reviews
64 reviews

Tech Specs

Energy Efficiency Class

A
Energy Efficiency Class
A
Energy Efficiency Class
A
Energy Efficiency Class
-
Energy Efficiency Class
-
Energy Efficiency Class
-

Timer

24 hour on/off
Timer
24 hour
Timer
-
Timer
24-hour
Timer
-
Timer
24-hour

Refrigerant Type

R290
Refrigerant Type
R290
Refrigerant Type
R290
Refrigerant Type
-
Refrigerant Type
-
Refrigerant Type
R290 Eco-Friendly

Cooling Capacity

7000 BTU
Cooling Capacity
9000 BTU
Cooling Capacity
8, 300 BTU
Cooling Capacity
-
Cooling Capacity
-
Cooling Capacity
9000 BTU

Weight

54.01325419 pounds
Weight
54.01325419 pounds
Weight
56.21787681 pounds
Weight
-
Weight
-
Weight
55.8430909646 pounds

Available On

Available On
Available On
Available On
Available On
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Our Top 3 Picks

Here are the top 3 recommended products with more information to help you find the right product for you
  • 9.8
    1
    Pro Breeze

    Pro Breeze 4-in-1 Portable Air Conditioner 7000 BTU with Remote Control, 24 Hour Timer & Dual Window Venting Kit Included. Powerful Air Conditioning Unit with Class A Energy Efficiency Rating

    Why we love it

    Compact design fits various spaces
    Remote and digital control for convenience
    Energy efficient operation saves on bills
    Main highlights
    • WINDOW KITS INCLUDED: This Air Conditioner includes two easy-to-install window venting kits, allowing the AC unit to fit either slide or hinged windows using the step by step instructions provided. Its space-saving design also ensures minimal intrusion.
    • POWERFUL AIR CONDITIONER : This 7000 BTU air conditioner provides strong and effective cooling down to 15°C in small, medium and large homes, living rooms, bedrooms and offices.
    • ENERGY EFFICIENT AIR CONDITIONER: This A/C unit boasts a Class A Energy Efficiency rating to ensure that keeping you cool in the summer heat is cost effective. This air conditioner utilises an R290 refrigerant which is up to 690 times more eco-friendly than traditional air conditioning gasses. The advanced sleep mode keeps you cool whilst reducing overnight energy consumption.
    • DIGITAL DISPLAY & REMOTE CONTROL: The air conditioners easy-to-use digital LED display and wireless remote control allows you to have full control of all operating modes including auto, cooling and sleep as well the built-in 24 hour on/off timer and adjustable thermostat temperature control (in °C & °F).
    • 4-IN-1 FEATURES: This portable air conditioning unit features 4 multi-purpose operating modes including auto, air cooling, dehumidifying, fan only and energy saving sleep modes.
  • 9.7
    2
    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

    Smart WiFi app and voice control
    Multi-function cooling with 4 modes
    Energy efficient operation
    Main highlights
    • 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.
    • 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.
    • 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.
    • 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
    • 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.
    • 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.
  • 9.6
    3
    De'Longhi

    De'Longhi Pinguino Compact PACES72 Classic Compact Portable 8,300 BTU Air Conditioner, 3 in 1 Air Conditioning Unit, Rooms up to 60m³, A Energy Efficiency, Window Kit Included, Energy Class A, White

    Why we love it

    Compact and easy to move
    Highly energy efficient
    Quieter operation
    Main highlights
    • WINDOW KIT INCLUDED - Window kit is included with 1.5m hose length, for easy installation
    • WINDOW KIT & CASTOR WHEELS - Window kit is included with 1.2m hose length, for easy installation, Easily move your air conditioner to the room of your choice with ease thanks to the integrated handles and castor wheels for easy portability
    • QUIETER COOLING - Pinguino Compact has a 50% noise reduction from max to min speed
    • ENERGY EFFICIENT - Class A Energy Efficiency rating, Refrigerant gas R290, which is up to 696 times more environmentally friendly than traditional gases (696 times compared to the impact of Global Warming of R410 - F-Gas Reg. 517/2014)
    • EASY TO USE - Manage all functions including temperature, fan speed, timer and cooling function, Control with remote control, or use touch controls on the unit, Integrated handles and castors wheels make for easy transportation
    • COMPACT COOLING - Pinguino Compact is a 8,300 BTU powerful cooling solution for living rooms, bedrooms and offices up to 60m³
    • 3 IN 1 FUNCTIONALITY - Enjoy ideal comfort thanks to this multifunctional 3-in-1 unit with 2 speed settings, Separate dehumidifying function (21l/ 24 hours) for especially wet seasons or humid rooms and separate fan function to simply circulate air

Our ranking system

The topchoice.co.uk Team selects top-of-the-line items from a wide selection and conducts rigorous evaluations on almost all the products available on the internet. We rank each product based on how well it matches our criteria.We can ensure that the product is well-tested with the help of our expertise, experts, and artificial intelligence technology. topchoice.co.uk requires consistent care for the products we review, ensuring that our assessments are always accurate and up to date.

Features

Our team of experts analyzes key attributes, capabilities, significance, and many more depending on the type of product to determine its effectiveness.
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Consumer Reviews

We ensure an evaluation of the ratings using references all over the internet for each product. With the help of our AI technology and professional review teams, we give weight to the worth of individual user experiences.
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Popularity

Popularity is an important criterion in choosing a product. Several factors contribute to the popularity of the products on our site, including prestige, relevance, reputation, news, and more.
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Value for money

topchoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.

When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.

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