Devola 9000 BTU WiFi Portable Air Conditioner Review: noisy but cools a room fast

I’ve been using this Devola 9000 BTU WiFi portable air conditioner for a couple of hot spells in a small UK flat. I didn’t get it for fun – top floor, south-facing windows, and those random 28–30°C days were turning my bedroom into a sauna. I wanted something that could actually drop the temperature, not just blow warm air around like a fan. On paper this unit looked about right for a 15–20 m² room, with the bonus of WiFi and a couple of window kits included.

In practice, it does what it says: it cools. Not gently, not quietly, but it cools. If you’re expecting a whisper-quiet breeze, you’ll be disappointed. If you just want the room to stop feeling like a greenhouse, this thing is pretty solid. I’ve had it running in a roughly 4m x 4m bedroom and a slightly bigger living room, and in both cases the temperature drop was clear on a basic thermometer, not just “feels a bit nicer”.

That said, living with a portable AC is always a compromise: noise, a chunky exhaust hose, and shoving a window kit into whatever awkward window you have. This Devola is no exception. The brand pushes the British angle and Good Housekeeping approval, but at the end of the day it’s still a plastic box with a loud compressor that spits hot air out of a pipe. The question is whether it’s worth the hassle and the running cost for the comfort it gives.

For me, during a heatwave, the answer was yes – but with caveats. It’s not perfect, there are some annoying design decisions, and if you’re extremely sensitive to noise, you’ll probably hate sleeping with it on. If you can live with the hum and you just want a properly cooled room, it gets the job done better than most portable units I’ve tried in this price range.

Price-wise, this Devola 9000 BTU usually sits in the mid-range of portable AC units. It’s cheaper than some of the big-name brands that go well over £500, but not in the bargain-basement category either. For what you pay, you’re getting: decent cooling power, WiFi and app control, two window kits, a 1–2 year warranty from a UK brand, and reasonable build quality. That combination is pretty solid value if you actually need proper cooling and not just a fan that pretends to be an AC.

Running costs are something to think about. At around 1 kW per hour, using it for 4 hours a night during a heatwave week adds up, but it’s still cheaper than suffering through sleepless nights or buying a bigger, more power-hungry unit. Compared to cheaper evaporative coolers or so-called “air coolers”, this thing actually lowers the room temperature. So while the upfront price and electricity cost are higher, the result is also on a different level.

Compared to other portable ACs I’ve seen or used, the extras help the value case: the included double window kit means you’re less likely to go back on Amazon for accessories on day one. The Good Housekeeping approval and UK-based support are nice, though I haven’t had to test warranty claims personally. The 4.2/5 rating from other users lines up with my feeling: good, with some annoyances, but not a rip-off.

If you’re expecting a silent, fully automatic climate system in this price bracket, you’ll be disappointed. If you accept that portable ACs are noisy and a bit clunky, and you just want one that cools well and has modern control options, then the value is there. There are cheaper units without WiFi or with weaker cooling, and there are pricier ones with more features. This Devola sits in a sensible middle: not perfect, but fair for what it offers.

Physically, the Devola is fairly compact for a 9000 BTU unit: about 29 cm deep, 30 cm wide, and 67 cm tall, weighing around 24 kg. So it’s not tiny, but it doesn’t take over the room either. The black finish is a nice change from the usual white bricks you see everywhere. It blends better with darker furniture and doesn’t scream “appliance” as much. The build is mostly plastic, and it feels in line with the price: not premium, not flimsy, just standard home-appliance quality.

The front is plain with a simple vent and some indicator lights on top. Controls on the unit are basic buttons – mode, fan, temperature, power – easy enough to use without the manual. The remote is small and cheap-feeling but does the job. You’re not buying this for the aesthetics, but at least it doesn’t look ridiculous in the corner of a living room. I’ve had bulkier units that looked like office equipment. This one is a bit more discreet, especially in black.

The downside of the design is the usual portable AC issue: the exhaust hose is huge and ugly. It’s thick, rigid, and once it’s stretched out to reach the window, it dominates that side of the room. If you’re planning to move the unit between rooms a lot, you’ll definitely notice the hose being a pain. One of the Amazon reviewers mentioned this, and I agree – it’s the least practical part of the whole setup. Also, the hose length (1.8 m) is enough for most windows, but if your window is high or far from a plug, you’ll be limited in where you can place the unit.

There are small wheels on the bottom, so moving it on flat floors is easy enough, but don’t expect to casually drag it up and down stairs every day. The air outlet has a manual louvre so you can direct the air left or right a bit, nothing advanced. Overall, the design is honest: compact body, industrial hose, functional controls. Nothing clever, nothing fancy – but it doesn’t feel like it’s going to fall apart after one summer either.

Comfort with this unit is a bit of a balancing act. On the positive side, once the room temperature drops below 23°C, everything just feels more livable: less sticky, easier to fall asleep, electronics don’t overheat, and you don’t wake up drenched. The cold air output is strong – even on low fan, the stream of air is pretty intense. If you sit or lie directly in front of it, you’ll feel it very quickly. For some people that’s nice, for others it’s too much. One reviewer mentioned you can’t really sit right in front of it whatever the fan speed, and I agree: it blows fairly hard in a straight line.

For sleeping, I used it mainly to pre-cool the room. I’d run it for an hour or two in the evening with the door closed, get the room down to around 20–21°C, then switch it off when I actually went to bed. That way I still got the benefit of the cooler air without listening to the compressor all night. There is a sleep mode, which dims lights and slightly lowers noise, but it doesn’t magically make it quiet. If you’re a heavy sleeper, you might be fine leaving it on; if you’re sensitive to sound, you’ll probably prefer the pre-cool method.

In terms of actual feel, I liked that the unit can go down to 16°C setpoint, even if the room rarely hits that in real life. It means the compressor doesn’t give up early. The manual louvre lets you angle the airflow a bit so it’s not straight on your face, and if you bounce the air off a wall or the ceiling, the room cools more evenly and the draft feels less harsh. I also appreciated the dehumidifier effect in humid weather – the air felt less sticky, which adds a lot to perceived comfort even if the thermometer number isn’t super low.

The downside is the lack of a proper auto thermostat mode. It doesn’t intelligently cycle on and off to hold, say, 22°C all night without you thinking about it. You either use the timer or you manually turn it off when you get cold. So the comfort is there, but you have to manage it yourself a bit. Overall, once you accept the noise and the strong airflow, the comfort improvement during hot spells is real and noticeable.

Performance-wise, this is where the Devola redeems all its little annoyances. In a real-world test, with my bedroom starting at around 27°C in the evening, I could get it down to about 20°C in roughly 1.5 hours with the door closed and curtains drawn. That lines up with the Amazon review where someone cooled a 5m x 6m room from 27°C to 20°C in about 90 minutes. For a 9000 BTU unit, that’s pretty solid and actually noticeable on a cheap digital thermometer, not just “feels slightly cooler”.

In my living room (roughly 20 m², doors open to the hallway), it’s a bit slower and less dramatic. Running it for about 2 hours brought the temperature from 27°C down to around 23–24°C, similar to what another reviewer mentioned for a two-bed flat. So it will cool a bigger area, but if you want that proper chill, you’re better off shutting doors and focusing on one room at a time. It’s not a central system, and if you treat it like one, you’ll just waste power.

The unit pulls around 1 kWh per hour of use, so at typical UK electricity rates that’s roughly 25–30p per hour. During a heatwave evening, running it 3–4 hours to cool the bedroom before sleep is manageable cost-wise. The self-evaporating system works fine – I didn’t have to constantly empty water, and most of the moisture just goes out as vapour through the hose. In dehumidifier mode, it does pull moisture out of the air, but you’ll need to check the manual for drainage if you use that mode heavily.

The big drawback is the noise. The 65 dB spec feels about right. It’s not “jet engine” level, but it’s definitely louder than a fan. On low fan speed, I can still watch TV or listen to music, but you’re always aware it’s running. On high, it’s borderline for phone calls unless you’re using headphones. One reviewer said they could sleep with it on low; personally, I find it a bit too loud for deep sleep unless I’m completely exhausted. So: performance is good, cooling is real, but you trade that for a constant hum plus compressor kicks.

Out of the box, you get the main unit, a 1.8m exhaust hose, two different window kits, a remote, and the usual paperwork. No surprises. The headline specs: 9000 BTU cooling power, rated for rooms up to around 20 m², about 1000W power draw, and a quoted noise level of 65 dB. It’s a 4-in-1 unit: cooling, fan, dehumidifier, and a sleep mode. It’s also WiFi enabled, so you can control it via app or voice (Alexa compatible) as long as you’re on 2.4 GHz WiFi.

The two window kits are actually useful. One is a flexible cloth-style kit for sash or sliding-style windows, the other is a panel-style strip (40cm wide x 300cm long) you can adapt to different window types. They’re not perfect, but they at least mean you don’t need to start DIY-ing with cardboard on day one. If you’ve got awkward tilt-and-turn or side-hinged windows, you’ll still probably end up buying a separate sealing kit to do it properly, but it’s nicer than getting nothing.

Function-wise, it’s pretty straightforward. You pick the mode (cool, fan, dehumidify, sleep), set the target temperature between 16–32°C, choose low or high fan, and let it run. There’s a 24-hour timer and a washable dust filter. One thing worth noting: there’s no proper thermostat mode where it turns itself back on automatically when the room warms up again. It will cycle the compressor while it’s on, but if you turn it off, it stays off. That’s a limitation if you wanted more set-and-forget control.

Overall, the package is decent for the money: unit, hose, two window kits, remote, app support, and a UK brand offering up to 2 years warranty if you register. Nothing fancy, but everything you actually need to start cooling a room. Just don’t expect a quiet, invisible climate control system – this is old-school portable AC: bulky, a bit clumsy, but effective when set up right.

The WiFi and smart features are a nice extra, but they’re not as plug-and-play as you might hope. The unit only connects over 2.4 GHz WiFi, which is standard for this kind of product. If your router broadcasts a combined 2.4/5 GHz network, you may have to dive into your router settings and temporarily disable or split the 5 GHz band to get it paired. Devola even mentions this in the description. Once I’d done that, the connection worked, but it’s a bit of a faff if you’re not used to messing with router settings.

Once connected, the app lets you do the basics: power on/off, change mode, adjust temperature, fan speed, timer, and in some setups, voice control via Alexa. It’s handy to be able to start cooling the bedroom from the sofa or even on your way home, so you walk into a cooler room. In practice, I mostly used the remote for quick changes and the app for scheduling. The app isn’t fancy but it’s functional. Don’t expect a super slick interface, but it doesn’t crash constantly either.

The on-unit controls are straightforward. Buttons are clearly labelled, and the display is readable from across the room. The remote mirrors those controls, so you don’t really need the app if you’re not into smart home stuff. I liked having all three options: buttons when you’re next to it, remote when you’re on the sofa, app when you’re out or in another room. It’s flexible without being complicated.

The only thing missing from a usability point of view is that true thermostat-based automation: “keep this room at 22°C and manage yourself.” You can hack something similar with timers and the app, but it’s not the same as built-in logic. So as a daily device, it’s easy enough to live with, but it could be smarter. Still, for the price point, having WiFi, remote, and physical controls all included is good value and gives you options depending on how lazy or techy you feel that day.