Air cooler vs air conditioner
Updated: 21 October 2026
You are comparing two boxes that both say cooling, one with a water tank and one with a hose, and amazon.co.uk titles do not keep them apart. This page is air cooler vs air conditioner as a choice of mechanism: a wet pad you can ventilate, or a refrigerant portable that exhausts heat outside. It does not rank the six listings on the [air cooler comparison](/hub/cooling/air-cooler). Figures are from Energy Saving Trust and the UK listings as of 19 October 2026. Peter F. did not measure a temperature drop. A qualifying purchase can earn a commission at no extra cost to you.
You are comparing two boxes that both say cooling, one with a water tank and one with a hose, and amazon.co.uk titles do not keep them apart.
You are comparing two boxes that both say cooling, one with a water tank and one with a hose, and amazon.co.uk titles do not keep them apart. This page is air cooler vs air conditioner as a choice of mechanism: a wet pad you can ventilate, or a refrigerant portable that exhausts heat outside. It does not rank the six listings on the air cooler comparison. Figures are from Energy Saving Trust and the UK listings as of 19 October 2026. Peter F. did not measure a temperature drop. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Shape | Tank | Airflow claim | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Midea Midea MCF23XRWUK | Tower | 7 L | 2000 m³/h (bullet); 1170 cfm (table) | 8.0 | about £140.92 | View offer |
| Best value |  LEENON LEENON ATF-026L | Tower | 3 L | 300 m³/h | 7.8 | about £119.99 | View offer |
 BLACK+DECKER BLACK+DECKER BXAC65014GB | Low box | 6 L | 300 m³/h | 6.3 | about £87.29 | View offer |
On this page
Two products, not two sizes
An air cooler in this set is a fan drawing room air through a wet pad. The tank holds 3–8 litres, the power line is 60–80 W, and there is no window hose. Ice packs are not a refrigerant circuit. A portable air conditioner uses refrigerant and an exhaust path, and it removes heat rather than adding moisture. A split system has an outdoor unit and is not a Saturday window kit. Several of these six use air-conditioning wording while the bullets describe a tank and a pad. The Consumer Rights Act 2015 says goods must match the description. The Guardian, on 13 August 2025, put a typical portable around 1,000 W and evaporative units in that test around 26–87 W. A water-only unit does not need an F-gas installer. A split that needs pipes does.
When the pad is enough
The pad is enough when the heat is dry, you can move some air out, and you will sit in the stream. Energy Saving Trust says an evaporative cooler adds moisture and cools the air near the machine. Reviewers here often describe relief in front of the grille and a wall thermometer that does not move. The weak case is muggy air in a shut room. No venting means there is no hose, not that the room should be closed. For a portable, the trust says to seal the gap around the hose. Those are opposite setups. If you need the room cooler and you can fit that hose, that is the other buy. If you cannot use a hose and you cannot ventilate, neither is a clean answer.
What a day costs
For 24 hours in Great Britain, Energy Saving Trust puts a fan at about £0.14–£0.30, an evaporative cooler at about £0.27–£0.39, and a portable air conditioner at about £4.62–£5. Northern Ireland on the same table is about £0.34–£0.48 for an evaporative cooler and about £6–£7 for a portable. This page does not turn 60–80 W into a new pence figure, and it does not repeat seller claims of a 2–5°C drop. Shelf prices of the six listings, on 19 October 2026, run from about £87.29 to about £140.92. A fan is the cheaper 24-hour line again, and it does not add water. Spending less while adding moisture is a poor trade if the room is already damp.
The condition, then stop
Choose the air cooler for local relief on a dry afternoon, when you can give the moisture somewhere to go and you do not need the thermometer to fall. Choose the portable when you need the room cooler, you can seal an exhaust hose, and you accept about £4.62–£5 in Great Britain or about £6–£7 in Northern Ireland for 24 hours. There is no larger version of the same machine on this page. The six kept listings are all the pad side. Which person gets which model is best air cooler. A split stays outside both unless you are ready for an outdoor unit and an F-gas installer.
Common questions
Is an air cooler the same machine as an air conditioner?
No. The coolers in this comparison are fans with a wet pad and a 3–8 litre tank at 60–80 W, and they have no window hose. A portable air conditioner uses refrigerant and must exhaust heat through a hose. A split system has an outdoor unit as well. Shared words in an amazon.co.uk title do not make them one product.
Does a water-pad cooler need a window hose?
No. None of the six kept listings specifies a hose. A bullet that says no venting is required is describing that fact. It is not an instruction to seal the room. A portable air conditioner does need a sealed exhaust path. Energy Saving Trust treats those as different setups: ventilate the evaporative unit, and close the room around a portable’s hose.
When is muggy air in a shut room a weak case for a pad?
When the air cannot take more moisture. Energy Saving Trust says these units add moisture and cool the air near the machine. A dry room you can ventilate, with you in the stream, is the stronger case. A shut, already humid bedroom is the weak one. Closing every window because the listing has no hose makes that weak case worse.
What does Energy Saving Trust say a day of each costs?
For 24 hours in Great Britain, about £0.14–£0.30 for a fan, £0.27–£0.39 for an evaporative cooler, and £4.62–£5 for a portable air conditioner. Northern Ireland on the same table is about £0.34–£0.48 for an evaporative cooler and about £6–£7 for a portable. Those are the trust’s bands. This page does not convert watts into a new pence figure.
Does a plug-in water cooler need an F-gas installer?
No. A water-only cooler has no refrigerant circuit. GOV.UK’s F-gas bans apply to products that contain fluorinated gases, including some movable air conditioners, and a split that needs pipework needs an installer. Do not assume every portable is outside those rules. Do not book an engineer to fill a 6 litre tank.
Related pages
Sources
Public UK sources from the digest, plus the amazon.co.uk listings for these six ASINs, checked on 19 October 2026.
- Energy Saving Trust: tips to keep your home cool (retrieved 19 October 2026)
- Electrical Equipment (Safety) Regulations 2016, regulation 35 (retrieved 19 October 2026)
- HSE: evaporative cooling systems (retrieved 19 October 2026)
- HSE: Legionnaires’ disease, L8 (retrieved 19 October 2026)
- GOV.UK: bans on F-gas in new products and equipment (retrieved 19 October 2026)
- DESNZ Energy Technology List: evaporative air coolers (retrieved 19 October 2026)
- Consumer Rights Act 2015 (retrieved 19 October 2026)
- The Guardian, 13 August 2025: best evaporative air coolers (retrieved 19 October 2026)
- amazon.co.uk listings B0GL7PCKDS, B0H9HZH4R8, B0H9J2FPLP, B0GD6YR1NG, B0GVTYDZ2F, B0DQKCTY1X (retrieved 19 October 2026)