HT12CESVWK 12,000 BTU Wi-Fi Portable

The Honeywell HT12CESVWK is a 12,000 BTU (about 3.5 kW) single-hose portable air conditioner with one genuinely useful trick: full app control with remote start, plus Alexa and Google voice control, at a mid-market price. It cools rooms of up to about 40 m², keeps up on the hottest days of a UK summer, and its 3-in-1 cooling, dehumidifying and fan modes make it useful beyond the heatwave weeks. As a machine, it does its job well and the smart features are the reason to pick it over cheaper 12,000 BTU rivals.

The caveats sit around the unit rather than inside it, and they matter. The company that made Honeywell portables under licence has wound down and no longer provides customer service, so the advertised 2-year warranty rests on the retailer you buy from in practice. New stock is patchy, with much of what remains sold as graded return units. And at the £479.99 full price it is poor value against similarly specced rivals; the sums only work at a discount. Buy it at the right price from a retailer you trust to handle a claim and it will not disappoint, but go in with your eyes open.

The HT12CESVWK is a single-hose portable air conditioner: a free-standing unit on castors that cools the room and vents the hot air out of a window through one flexible hose. Nothing needs installing and nothing needs an F-Gas engineer, so it is cooling you can have running the same day it arrives, using the window kit supplied in the box. At 12,000 BTU (about 3.5 kW) it sits at the larger end of the portable market, sized for rooms up to roughly 40 m², which covers most living rooms and open-plan kitchen-diners. A sun-trap conservatory needs far more cooling per square metre, so treat the effective area there as about 20 m².

What sets it apart at this price is the smart control. The Honeywell Air Comfort app gives you scheduling and remote start, so the room is already cool when you walk in, and Alexa and Google Assistant voice control both work properly rather than as a box-ticking gimmick. Add the dedicated dehumidify mode and the three-speed fan and it is a machine with a job to do in a damp British October as well as a July heatwave. R290 refrigerant and a class A label keep it respectable on efficiency for a single-hose design.

Who should look elsewhere? Anyone who needs near-silent running: at up to 65 dB(A) on full power it is typical-loud for the format, fine behind a television but not something to sleep next to at full tilt. Anyone who plans to carry it between floors, because 30 kg is a two-person lift. And anyone who cannot find it discounted, because at the £479.99 full price there are better-value 12,000 BTU rivals among the portable air conditioners we rate. There is also a bigger caveat around support, covered below, that anyone buying in 2026 needs to weigh.

The list price is £479.99, and at that money it is hard to recommend: quieter and better-supported 12,000 BTU portables cost the same or less. The value case opens up below about £400, and graded return units have been listed at around £256 with a 6-month warranty, which is a fair gamble for a unit this capable. The honest picture on availability is that new stock is thin: in the August 2026 heat both specialist retailers we track were out of stock, leaving the Amazon listing as the most likely place to buy new. Check the live price and the seller before you commit.

Now the warranty catch. Honeywell does not make these units itself; they were made and supported under licence, and that licensee has wound down and no longer provides customer service. The 2-year warranty retailers advertise therefore rests on the retailer in practice, alongside your statutory rights under the Consumer Rights Act 2015. That is workable if you buy from an established UK retailer, and it is exactly why we would not buy this unit from an unfamiliar marketplace seller. Factor it into the price you are willing to pay.

Running costs are straightforward. It draws 1,300 W at full cooling, so at the July 2026 Ofgem price cap of 26.11p per kWh that is around 34p an hour flat out, and less once the room is at temperature and the compressor cycles rather than running continuously. A typical UK summer of occasional evening and weekend use lands somewhere around £25 to £40. Prices and rates correct as of August 2026; the energy price cap changes quarterly, so check current rates before budgeting.