The amount of water vapour that air can hold varies with the temperature. Cold air can’t hold much, but warmer air can. At any temperature, once you reach the maximum amount possible, any extra vapour condenses out as liquid water – misted up windows, dampness, even drips and pools of moisture on window sills or under lamp posts. In winter, the condensation point is reached very easily, which is why you get your windows all steamed up and everywhere is often damp, but in hotter weather it is more appropriate to think ‘sauna’ (which is why it gets ‘muggy’). This air moisture is what we call ‘humidity’. I fired up my trusty data logger and left it in front of my desk fan for 30 minutes for the control data. Then I powered up the Chillmax and moved the logger in front of it for the same period of time. This is what it recorded (the red line is where I moved it). For the following locations next day delivery may take up to two working days: Aberdeen (AB 30-35, 41-54), Northern Highlands (AB 36-38, 55-56), FK (17-21), HS (1-8), IV (All), KW (0-14), PH (15-32, 34-48), Eire (Republic of Ireland) (EI (ZZ75) (All)), Glasgow (G 83), Guernsey (GY 9), Oban (HS 9, KA 28, PA 20-99, PH 33, 49-99), Isle of Man (IM (All)), Arran (KA 27), Orkney Shetland (KW 15-99, ZE (All)) and Cornwall (TR 21-25).

The calculation for this is complex (you should see how long my Excel formula for it is). It is non-linear, and the increase in ‘feels like’ is greater at higher temperatures. It also contains an element of opinion/perception, which is why there’s no point using numbers above about 60ºC. But the ‘Heat Index’ is what forecasters use. Incidentally, the official health designations for the colours are: yellow – caution; amber – extreme caution; orange – danger; and red – extreme danger. Vulnerable people need to take these into consideration before going out in hot weather. Only the air being directed at you is cooler. Once that slightly cooler air has passed through warmer air, it’ll be close to ambient again. The device cannot cool down a room. It’s far too small for that. The secret is Hydro-Chill Technology, which uses our advanced evaporative air-cooling filter and our enhanced cool-mist chamber, to pull in warm, dry air and instantly transform it into cool refreshing air! The filter is resistant to mould and mildew and can be put in the dishwasher to clean and sterilise it for years of use. At the time of this most recent edit, it is 20 minutes past midnight on 19 July 2022 and the official Met Office temperature in Nottingham (where I am) is between 28ºC and 29ºC (it was just over 37ºC earlier on 18 July). Humidity is 35%RH, but it is up to 60%RH less than 40 miles away at the next Met Office station. In Nottingham, humidity peaked at 60%RH on 18 July, even if it dropped to under 30%RH at times. And that was outdoors – indoors you can add 30-40%RH without blinking.JML claims the Chillmax can run for up to 10 hours per fill, but this is likely on the lowest of the three fan speeds, since on top speed it runs out in less than three hours. JML sells the humidification as a positive without relating it to the comfort relationship between temperature and %RH, but note what I said above. If you want to cool down in humid weather, it isn’t just the temperature that needs to come down.

The ambient humidity in the room where I did the test was about 44%RH. The Chillmax sent that up to over 70%RH. It is this elevation of the humidity of the cooled air which really brings into question whether the Chillmax is worth the investment. This antimicrobial replacement filter will keep your Chillmax Air running perfectly for months. Designed specially to fit, easily into your Chillmax Air cooler, you can simply swap out the old filter for this new one and you're ready to go! Why not have a spare filter on hand so you always have a clean, working filter in your Chillmax Air and you're never left waiting for the dishwasher on those really hot, dry days and nights? We recommend you replace your filter every three to six months so this replacement filter will last you all Summer! Now, some people might be thinking that a 4ºC is better than nothing at all. And they’d be right if it was just a matter of temperature. But there’s more to it than that. I mentioned that the exhaust from the Chillmax felt ‘softer’. I knew what it was, but my data logger shows it in numbers.

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There are many, many more. And in every case, the relationship with humidity is the key. If it is already humid, evaporative coolers do not work and actually make things worse.

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. The large capacity water reservoir, combined with the filter, means that Chillmax Air holds a lot of water, so you can rely on Chillmax Air to run for up to ten hours, that's a whole night's sleep, or an entire working day in a hot stuffy office, breathing in cool, humid air! Cools and humidifies Until August 2021, the answer in relation to the ChillMax was no. However, I saw an advert (as shouty as usual) for the InstaChill tonight. Unlike the ChillMax, which is the size of a small table top radio, the InstaChill is the size of a bedside cabinet. And you can certainly get larger evaporative coolers from other manufacturers. The working principle is identical, except that the larger the surface area of water, and the greater the airflow over that water, then the greater will be the possible drop in temperature at the front end (and the more moisture being pumped out to increase the humidity). However, cooling effectiveness is influenced greatly by the RH of the air going in. Chillmax Air uses a super-quiet fan set within its sound-protective casing so the noise you hear is minimal, and with three settings you can have the perfect amount of cool, moist air with the least amount of noise. Reusable, antimicrobial filter, runs up to 10 hours per fill Chillmax Air uses a fan set within its sound-protective casing, and with three settings you can have the perfect amount of cool, moist air for whatever the weather throws at you When the air outside is just as hot and dry as it is inside, you want to take your personal cooling with you. Chillmax Air Go is portable and rechargeable so you can charge up the fan, fill the water tank and away you go! Thanks to the sure-grip clamp you don’t even have to carry it. Just clamp it to your desk, table, the handle of a pram or buggy, take it in the car with you- wherever you want to go, you can have personal cool air at all times! Also has an LED nightlight

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As an example, if the air temperature is 30ºC and 50%RH, it will feel like 31ºC, but if the humidity goes up to 80%RH, then it will feel like 38ºC – even though the thermometer still tells you it’s 30ºC. Early in July 2019, I saw the Chillmax Air advertised on TV in one of those shouty JML ads. That same evening, I was shopping in Asda and saw it on display. I am an idiot for things like this, and bought it on impulse so I could test whether it worked or not. Someone found this article on the search term “jml chillmax air for pc cooling”. No. Blowing damp air into your PC would be dangerous, potentially expensive, and would only gain you 4ºC at best.

They cool the inlet air by several degrees. But they send the humidity of that air up considerably, and this cancels out the benefits of the cooling effect when it is very hot. The ‘Heat Index’ is the key detail, as explained above. In the case of the InstaChill, it will add a lot more humidity than the ChillMax, and as I have explained and demonstrated, the ChillMax is bad enough when it comes to increasing the ‘feels like’ temperature. Chillmax Air gives you the best features of both fans and air conditioning in one, compact unit that's also a night light. Unlike fans that just move warm air around your room, or air conditioning units that cost the earth, make a lot of noise and use ozone-destroying chemical coolants to cool the air but leave it dry, Chillmax Air sprays a fine mist that is then sent through the special filter and so only uses evaporation and water to operate! Chillmax Air gives you the best features of both fans and air conditioning in one, compact unit that’s also a night light. Unlike fans that just move warm air around your room, or air conditioning units that cost the earth, make a lot of noise and use ozone-destroying chemical coolants to cool the air but leave it dry, Chillmax Air sprays a fine mist that is then sent through the special filter and so only uses evaporation and water to operate! Chillmax Air gives you the best features of both fans and air conditioning in one, compact unit that's also a night light. Unlike fans that just move warm air around your room, or air conditioning units that cost the earth, make a lot of noise and use ozone-destroying chemical coolants to cool the air but leave it dry, Chillmax Air sprays a fine mist that is then sent through the special filter and so only uses evaporation and water to operate! Adjustable three-speed whisper-quiet fan At lower temperatures the Chillmax will produce a slight net cooling effect. But if the air temperature is above about 30ºC (and 50%RH) – which isn’t excessively hot or humid to start with, though it is around the point where you would start thinking about cooling things down – it’ll actually make you feel warmer. And if it is already humid outside, you’ll feel hotter still.It might – while you’re blowing air over ice. But once they defrost, which will happen in a few minutes in the temperatures you’ll likely be experiencing, then no. You’ll also have more condensate to deal with from the melted ice pouring out of the front grille. The term ‘humidity’ usually refers to the absolute humidity, which is amount of water in the air. However, the figure most people are referring to is the relative humidity. This is the amount of moisture in the air expressed as a percentage of the maximum amount it could hold at that temperature, hence the units %RH. It’s a complicated subject, but the important factor for us here is that when it is warm or hot, higher absolute humidity is uncomfortable because the amount of moisture in the air relative to the maximum possible is higher. Indeed, you may have seen weather forecasts where they give the actual temperature and the ‘feels like’ equivalent – that’s a reference to the ‘ Heat Index’, which takes into account the effect of the %RH. Here’s a graphical chart for that.