Most dehumidifiers are noisy, averaging decibel levels of between 34-48dB. That's because they draw in air via a fan and then use a compressor and refrigerant to cool and condense the air to extract the moisture from it. The alternative is a Peltier dehumidifier, which, although not specified, is likely the method the Silentnight 39899 600ml Dehumidifier uses. In contrast to a compressor dehumidifier, a Peltier dehumidifier uses a far quieter thermo-electric process to extract moisture from the air. You’re more likely to know Acer for its PCs, laptops or monitors, but its foray into air purifiers shows a lot of promise. The Pro P2 is a mid-sized tower – just under 58cm tall – with the top accommodating the fan’s grille, the minimal controls, and a 1.5in square OLED colour screen. The latter gives you the current PM2.5 reading, plus an at-a-glance air quality indicator, with the text turning from green through amber to magenta as it worsens. Most dehumidifiers have their noise levels listed in their specifications, although in practice we didn't find that much variation between models, with most falling somewhere between 35 and 45dB. The best air purifiers for larger rooms 1. Hoover H-Purifier 500: Best quiet purifier for larger rooms

Lastly, there's extra functionality to consider. The best dehumidifiers you can buy offer a Smart mode. That means you can leave the dehumidifier running and its sensors will detect the humidity levels and switch the machine on and off to keep humidity within your desired range. That saves energy (and money) as the appliance isn't running if it doesn't need to be.Filter replacement indicators aren’t crucial and not all air purifiers have them, but this is a helpful feature as a clogged air cleaner won’t work properly. The CADR aims to provide an objective measure of the effectiveness of a portable air purifier at dealing with different types of allergens. A purifier with a score of 250 for dust particles is as effective as adding 250 cubic feet of clean air per minute. Buyers should focus on the results of the specific pollutant they’re aiming to eradicate, whether that’s pollen, smoke or dust, and many manufacturers will supply CADR figures for the most common. An air-quality sensor, which enables the machine to switch itself on when the air quality becomes poorer, can be useful. After all, you can’t see when the air quality dips, for example, as the result of a high pollen count.

Plus, the MeacoDry Arete One dehumidifier'sSmart Laundrymodeworks brilliantly for drying washing indoors – wet laundry was dry in hours rather than the days it can usually take in the draughty Victorian terrace we tested the unit in. That said, if you find the Pro Breeze 12L Low Energy Dehumidifier on offer, and are willing to accept its flaws in exchange for its lower price point, this can be a great value buy that does the job and will make a big improvement to general damp issues. Overall, if you can put up with its increased noise volume and absorb the higher running costs, we think thePro Breeze 20L Premium Dehumidifier with Special Laundry Modeis a good buy. It's definitely the best dehumidifier for drying clothes that we've tested, and anything that makes wet-weather laundry days easier is a win in our books. This product comes with a free one year manufacturer guarantee. A free second year guarantee is available upon registering your product.Explore Comet and discover a constellation of products from washing machines and fridge freezers to air fryers, 4K TVs, laptops, consoles and more - it’s easy to find everything you need for your home in the Comet universe. It’s just as good as an air purifier too, though its CADR rating is slightly below that of the purifier-only Pro P2. In tests, it took PM2.5 levels from a maximum 411 micrograms per square metre to 25 in 135 seconds, bringing it down to double figures in just over a minute. Again like the Pro P2, it’s quiet, with the noise barely noticeable at the lowest speed in purifier mode. Left on Smart mode, with the front-facing display turned off, all but the lightest sleepers should be able to sleep through. That extraction level may not sound like much, and this certainly isn't a dehumidifier that can cope with large damp problems or help to dry washing. But, in practice, our tests found it worked well when left running in the bedroom overnight in our tester's single-glazed Victorian terrace. It reduced the build up of condensation around windows in the morning, and the air in general also felt fresher whenever it was running. It also did really well to help eliminate steam and fumes in the kitchen whilst cooking.