10 best air conditioners for small rooms in 2026 (66+ compared)

The best ARGO air conditioner for small rooms is ARGO Ecowall 12, with an overall score of 7.43 points, a cooling capacity of 12000 BTU/h, a cooling energy class of A++, and a price of around £300.

The ARGO Ecowall 12 is a fixed wall-mounted split-system air conditioner featuring a nominal cooling capacity of 12,000 BTU/h (3.2 kW) and utilizing eco-friendly, low-GWP R32 refrigerant alongside advanced DC Inverter technology. This 3-in-1 multi-functional unit provides cooling, dehumidification (1.4 L/h), and heating with an energy efficiency rating of A++ for cooling and A+ for heating, achieving a seasonal cooling SEER of 6.1.

Runner-up: ARGO Ecowall 9, with an overall score of 7.19 points, a cooling capacity of 9000 BTU/h, a cooling energy class of A++, and a price of around £520.

Our top-rated Comfee air conditioner for small rooms is Comfee TROPICAL 9K, achieving an overall score of 7.95 points, a cooling capacity of 9000 BTU/h, a cooling energy class of A++, and priced around £280.

The Comfee TROPICAL 9K is a 9000 BTU monosplit inverter air conditioner featuring an average airflow of 333 m³/h and utilizing eco-friendly R32 refrigerant to cool or heat rooms up to 25 m² with an efficient A++/A+ energy rating. Main characteristics and pros include integrated WiFi app control, a "Follow Me" thermal sensor on the remote for targeted climate control, a dual filtration system (high-density and cold catalyst filters) that eliminates up to 80% of dust and volatile organic compounds, and a durable golden anti-corrosion coating on the heat exchangers.

Runner-up: Comfee 7000 BTU Portable Air Conditioner, with an overall score of 7.29 points, a cooling capacity of 9000 BTU/h, a cooling energy class of A, and a price of around £210.

Our top-rated DILOC air conditioner for small rooms is DILOC FRPRO.93Q, achieving an overall score of 7.17 points, a cooling capacity of 3 × 9000 BTU/h, a cooling energy class of A++, and priced around £1280.

The Diloc Frozen Pro FRPRO.93Q is a high-capacity quadri-split outdoor air conditioner unit that delivers a powerful 32,000 BTU/h (9.4 kW) in cooling mode and 32,000 BTU/h (9.5 kW) in heating mode. Operating on eco-friendly R32 refrigerant, the system delivers seasonal efficiencies with a SEER of 6.1 (Class A++) and a SCOP of 4.0 (Class A+/A++).

Runner-up: DILOC D.FROZEN112, with an overall score of 7.25 points, a cooling capacity of 12000 BTU/h, a cooling energy class of A++, and a price of around £330.

Our top-rated KESSER air conditioner for small rooms is KESSER Split 9000 BTU, achieving an overall score of 7.78 points, a cooling capacity of 9000 BTU/h, a cooling energy class of A++, and priced around £440.

The KESSER Split Air Conditioner features a 9,000 BTU (2,600 Watt) capacity, an airflow rate of 420 m³/h, and utilizes eco-friendly R32 refrigerant. Operating on a 220-240V power supply, this versatile split system offers cooling, heating, ventilation, and dehumidification modes for small to medium spaces up to 25 m².

Runner-up: KESSER Split 12000 BTU, with an overall score of 7.69 points, a cooling capacity of 12000 BTU/h, a cooling energy class of A++, and a price of around £500.

The best Ariston air conditioner for small rooms is Ariston Prios 9, with an overall score of 7.32 points, a cooling capacity of 9000 BTU/h, a cooling energy class of A++, and a price of around £250.

The Ariston Prios 9 is a wall-mounted inverter air conditioner utilizing eco-friendly R32 refrigerant, featuring a 9,000 BTU cooling and heating capacity, an A++ cooling energy efficiency rating, and integrated antibacterial filtration. Its main pros include ultra-silent operation, a customizable Follow Me temperature tracking system, and smart scheduling functionality, though its primary drawbacks are the requirement of a separate Wi-Fi accessory kit for remote app integration and a complex initial setup process.

Runner-up: Ariston Prios 9+9, with an overall score of 7 points, a cooling capacity of 2 × 9000 BTU/h, a cooling energy class of A++, and a price of around £880.

The best Daikin air conditioner for small rooms is Daikin FTXB35C, with an overall score of 7.25 points, a cooling capacity of 12000 BTU/h, a cooling energy class of A++, and a price of around £510.

The Daikin FTXB35C is a wall-mounted wall split inverter air conditioner with a nominal cooling capacity of 3.30 kW (11,260 BTU/h) and a heating capacity of 3.50 kW, featuring an A+ seasonal energy rating for both modes with a SEER of 6.05 and SCOP of 4.06. Main characteristics and pros include its ultra-quiet indoor operation down to 21 dB(A), an advanced titanium apatite photocatalytic air-purifying filter, a 20-minute rapid turbo mode, and a flat, easy-to-clean front panel that blends smoothly into residential spaces.

Best value alternative: Daikin Sensira FTXF25A, with an overall score of 7.45 points, a cooling capacity of 9000 BTU/h, a cooling energy class of A++, and a price of around £500.

Explore our dedicated best Daikin air conditioners guide for full model rankings.

The best electriQ air conditioner for small rooms is electriQ iQool9Plus 9000 BTU, with an overall score of 8.25 points, a cooling capacity of 9000 BTU/h, a cooling energy class of A+++, and a price of around £550.

The electriQ iQool 9000 BTU Wall Mounted Split Air Conditioner is a highly efficient heating and cooling solution designed for rooms up to 26 m², boasting an exceptional A+++ energy rating for cooling (SEER 8.5) and A++ for heating (SCOP 4.6). Driven by a Super DC Inverter and a reliable GMCC compressor, this smart system integrates built-in Wi-Fi for smartphone scheduling, a 560 m³/h airflow rate, a dedicated dehumidifier, an auto-clean cycle, and "Follow Me" temperature tracking via the remote sensor.

Best value alternative: electriQ iQool12Plus 12000 BTU, with an overall score of 8.59 points, a cooling capacity of 12000 BTU/h, a cooling energy class of A+++, and a price of around £510.

The best Olimpia Splendid air conditioner for small rooms is Olimpia Splendid Aryal S1 E Inverter 10 C, with an overall score of 7.51 points, a cooling capacity of 10000 BTU/h, a cooling energy class of A++, and a price of around £260.

The Olimpia Splendid Aryal S1 E Inverter 10 C (Model OS-K/SEAPH10EI) is a high-wall mono-split heat pump air conditioner delivering a cooling capacity of 10,000 BTU/h (2.64 kW) and a heating capacity of 2.93 kW. It utilizes eco-friendly R32 refrigerant gas and features advanced inverter technology, yielding high seasonal efficiencies with an A++ energy rating for cooling and A+ for heating.

Runner-up: Olimpia Splendid Mystral E Inverter 9, with an overall score of 7.68 points, a cooling capacity of 9000 BTU/h, a cooling energy class of A++, and a price of around £240.