The special, antimicrobial filter in Chillmax Air is designed to hold water without allowing the bacteria and mould that it contains to develop and grow, it’s even dishwasher-safe so you can regularly clean it and use it time after time. Be careful if you read any of the reviews on these things – people may have noticed cooling in already cooler conditions, but trust me – if it’s very warm and humid, you will not notice any effect. However, ether is both highly flammable and toxic, so apart from demonstrating it in the school lab (where I remember the fumes gave me a massive headache), it doesn’t have much practical application these days. The unit consists of a reservoir at the top, which you fill with normal tap water, and this drips down on to a radiator unit which has ten sideways-stacked fibre panels in it through which a fan blows air.

There are two buttons on the top rear, one which changes the fan speed to one of three settings (or off), with a blue LED for each, and another button that turns the night light on or off. Let’s work on the assumption that it would be able to get the same 4ºC drop no matter what the ambient temperature was. With Chillmax Air Go you’ll get measurably cooler air coming right into your personal space that isn’t dry!A typical proper air conditioner for a small or medium-sized room will be about the size of bedside cabinet. Thanks to the sealed water tank, cordless design, and rechargeable battery, you can take Chillmax Air Go out with you wherever you go – making it perfect for work, in the car, or even at the gym!

A small number of products may require an additional postage cost due to the size of the parcel or other special considerations.

Chillmax Air's compact and lightweight design means you can enjoy cool fresh air anywhere from the bedside to the office.

Robert Dyas Holdings Limited T/A Robert Dyas is an appointed representative of Product Partnerships Limited which is authorised and regulated by the Financial Conduct Authority (FRN 626349).It is this elevation of the humidity of the cooled air which really brings into question whether the Chillmax is worth the investment. When I first set it up and turned it on, the first thing I noticed was that the fan is quite powerful, so you get a good flow of air directed at you – but note that that it’s only a 5″ computer fan, so it can’t beat a proper desk fan for air flow. If you’ve ever used a normal desk fan you will know that you only feel cooler if you’re sweating a bit.

None of the conclusions I arrived at were influenced by any other sources – I didn’t look it up first, nor have I had any inclination to do so since I first wrote the article.Do the same comparison when the surrounding temperature is 38ºC, and the ‘feels like’ goes from 43ºC to over 50ºC! In the right light, you can actually see it – it’s essentially fog, so the cooled air is also moistened. However, it also sends the humidity up, and in most cases that actually makes you feel hotter and more uncomfortable. Remember that the reason you even found this article was probably because it’s over 30 ºC outside – the more above that it is, then the more hits I get. So in a small room, you could easily increase the ‘ambient’ RH without any cooling at all, and that will make it feel even hotter.