Portable air conditioner buying guide
Updated: 21 October 2026
A hot bedroom in a UK terrace, or a rented living room you cannot drill, is usually a one-room job. You want a portable air conditioner that refrigerates, not a fan with a water tank, and you want the BTU band, the window, and the price settled before you pay. This guide uses the eight amazon.co.uk listings in our [mobile air conditioning units comparison](/hub/cooling/mobile-air-conditioning-units), scraped on 19 October 2026. Peter F. did not lab-test them. A qualifying purchase through our links can earn a commission at no extra cost to you. A correct BTU still fails if the hose is not sealed to the window you actually have.
A hot bedroom in a UK terrace, or a rented living room you cannot drill, is usually a one-room job.
A hot bedroom in a UK terrace, or a rented living room you cannot drill, is usually a one-room job. You want a portable air conditioner that refrigerates, not a fan with a water tank, and you want the BTU band, the window, and the price settled before you pay. This guide uses the eight amazon.co.uk listings in our mobile air conditioning units comparison, scraped on 19 October 2026. Peter F. did not lab-test them. A qualifying purchase through our links can earn a commission at no extra cost to you. A correct BTU still fails if the hose is not sealed to the window you actually have.
Our top picks
| Badge | Product | Capacity | Weight | Window kit | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  iCAN iCAN 9000 BTU 5-in-1 | 9,000 BTU | Not stated | Sliding kit, measure it | 7.0 | about £399.99 | View offer |
 Air Pro Air Pro AP-E6 9000 BTU | 9,000 BTU | 23.5 kg | Window kit listed | 6.4 | about £449.99 | View offer | |
| Best value |  Air Pro Air Pro AP-E3 7000 BTU | 7,000 BTU | 20 kg | Often fails on casement | 6.7 | about £324.99 | View offer |
On this page
What you are actually buying
A mobile air conditioner here is a monobloc: one cabinet on castors, a compressor in the room, and a hose that sends heat outdoors. Cabinets that match that description weigh about 19–26 kg and draw roughly 800–1,650 W. The Air Pro AP-E3 is 20 kg and 785 W. The 9,000 and 12,000 BTU Air Pros are 23.5 kg and 26 kg. The tedheve title says 12,000 BTU, and the attributes say 4.5 kg and 75 W, with a power cord rather than a hose. The generic Pac-18000 title says 18,000 BTU and then prints 1650 Kilowatts beside 1,650 W. Those rows are conflicts, not shortlist items. An evaporative cooler has no hose that dumps heat outside. Great Britain bans new movable units that use F-gases with a global warming potential above 150, so the portables that state a gas here say R290. You do not top that up.
BTU and the room
Match the BTU to one closed room, then add a margin if the room is sunny, a loft, or full of computers. Published rules of thumb do not agree, so keep that label on them. In this set the Air Pro 7,000 BTU states 15 m², the 9,000 BTU states 20 m², and the 12,000 BTU states 30 m². The iCAN states 20 m² and also prints 215 sq ft. A medium UK bedroom often sits in the 7,000–9,000 band if you keep the door shut. A south-facing loft with a PC is the case for sizing up. The DUXMM title prints both 7,000 and 9,000 BTU, so you cannot place it on a band until the page picks one figure.
Window, hose, and noise
Sash and vertical sliding windows usually take a rigid panel. Casement and tilt-and-turn windows usually need a zipped fabric seal. Measure the opening, not the glass. Ideal Home’s notes say to keep the hose short, with about 50–60 cm between the unit and the window. Air Pro reviews on the 7,000 BTU model say the supplied kit often fails on casement windows, and some buyers received only one kit. The iCAN bullets quote 17–53 inches, while the attributes cap width and height at 53 cm. The DUXMM box has a hose, not a window panel. If your only window is a UK casement, follow the how to vent a portable air conditioner sequence before you assume the box is enough. The iCAN prints 55 dB and the Air Pros print 65 dB. Sleep mode does not move the compressor outside.
Energy class, refrigerant, and price
Single-duct portables are labelled on an EER scale, not the SEER scale used for many splits. On the retained Regulation 626/2011 scale, class A can be an EER of about 2.6. We have not checked these eight class badges against that regulation. The generic page prints A+++ beside SEER 2.6, which mixes the two scales. Which? has cited about 22p an hour in its own tests of other units. That is not a running cost for these ASINs. Shelf prices here run from £324.99 to £556.99. A bestseller snapshot showed £276.24. Use the £324.99 product page. Heat is stated on the iCAN and the Air Pro AP0502. Who each listing is for sits on the best portable air conditioner page.
Common questions
What BTU do I need for one room?
Use a rule of thumb and then adjust. AirconAlert’s band is about 7,000–9,000 BTU up to 18 m² and 9,000–12,000 BTU for 18–28 m², at roughly 340 BTU per square metre. ClimaTrade is a little tighter at the bottom, and Which? is tighter again. Add something like 10–20% for a sunny loft or a room full of electronics. The 15 m², 20 m², and 30 m² lines on these listings are maker claims, not a measured result in your flat.
Is a unit without a hose an air conditioner?
Not in this category. A portable air conditioner here rejects heat through an exhaust hose to the outside. A machine with no hose is usually a fan or an evaporative cooler, which wets the air instead of refrigerating it. The tedheve included line names a power cord and not a hose, which is why that 12,000 BTU title does not get a shortlist place.
Does class A mean it is cheap to run?
On a single-duct portable, class A can mean an EER of about 2.6, which is not class A on a split SEER scale. Ariston’s Mobis 9 shows that pattern, and we have not verified the class lines on these eight pages. Which? has talked about roughly 22p an hour in its own tests of other machines. That figure is not a quote for the Air Pro or the iCAN in this set.
Will the included kit fit a casement window?
Often it will not. Air Pro reviews say the supplied kit fails on casement and hinged openings, even where the bullets mention hinged windows. The iCAN kit is described for sliding windows, and its inch and centimetre limits disagree. Casement and tilt-and-turn windows usually need a fabric seal. Measure the opening before you assume the box covers a hinged UK window.
What weight and wattage should a real portable show?
In this set, a plausible compressor cabinet is about 19–26 kg and roughly 800–1,650 W. The Air Pros, and the DUXMM at 19 kg, sit in or near that weight band. The tedheve’s 4.5 kg and 75 W do not. If weight or watts are missing, as on the iCAN, read the rest of the page and the reviews before you treat the BTU headline as settled.
Should I pay more for Wi-Fi or heating on the first buy?
Pay for heat if you want the unit in spring and autumn as well as in a heatwave. The iCAN lists heat and has 4.3 from 20 reviews at £399.99. The Air Pro AP0502 lists heat at the same price and has no star line. On the 9,000 BTU Air Pro, several reviews say Alexa did not connect. For a few hot nights in a small room, read the 7,000 BTU Air Pro at £324.99 first.
Related pages
Sources
Public UK sources used for this page on 20 October 2026. Prices, stars and review counts are the amazon.co.uk figures in this comparison. Stated room sizes and decibel lines were not treated as a lab test.
- GOV.UK: bans on F-gas in new products and equipment (retrieved 20 October 2026)
- legislation.gov.uk: Regulation 626/2011 Annex II (retrieved 20 October 2026)
- GOV.UK: Beat the heat, staying safe in hot weather (retrieved 20 October 2026)
- NHS: Heatwave, how to cope in hot weather (retrieved 20 October 2026)
- Which?: how to buy an air conditioner (retrieved 20 October 2026)
- Ideal Home: portable air conditioner window kits explained (retrieved 20 October 2026)
- electriQ: portable air conditioner manual (retrieved 20 October 2026)
- amazon.co.uk: Mobile Air Conditioners bestsellers, 19 October 2026 (retrieved 20 October 2026)