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. Chillmax Air Pure Chill 2.0 uses a better, improved fan, built within its sound-protective casing, to distribute the cool air in your direction. And with four settings, including the new ‘Turbo’ setting for rapid, boosted cooling, you can have the perfect amount of cool, moist air for whatever the weather throws at you, day or night! Evaporative, washable filter for long lasting cooling Another example. If the air temperature is 35ºC, at 50%RH it will feel like 41ºC, but send the humidity up to 80%RH and it’ll feel like 57ºC – even though the thermometer still reads 35ºC. 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!

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. 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 Pure Chill uses a better, improved fan, built within its sound-protective casing, to distribute the cool air in your direction. And with three settings, you can have the perfect amount of cool, moist air for whatever the weather throws at you, day or night! Built-in LED mood and night light with SEVEN colours

And whilst the UK isn't exactly the renowned hub for sunny weather - it's not a bad thing to be prepared for the warmer weather. For customers who suffer with night sweats, an air conditioner with adjustable cool settings could be a nice touch for a more comfortable night's rest. 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. 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!

Best portable air conditioners to buy

The special, antimicrobial, silver-infused filter in Chillmax Air Pure Chill is designed to hold water without allowing the bacteria and mould that it contains to develop and grow, it’s even washable so you can regularly clean it and use it time after time. The top-fill water reservoir, combined with the filter, means you can rely on Chillmax Air Pure Chill to run for a whole night’s sleep, or an entire working day in a hot stuffy office, breathing in cool, humid air! Increased power with 3 fan settings

The JML ChillMax Air Personal Space Air Cooler and Humidifier doesn’t use chemicals or toxic coolants. It uses ordinary water to keep you and your family safe. These are the data for relative humidity recorded at the same time as the temperature measurement, above (the red line is where I moved the logger). The humidity went up dramatically – a jump of about 30%RH. So, the Chillmax definitely cools the air that passes through it. Let’s work on the assumption that it would be able to get the same 4ºC drop no matter what the ambient temperature was. If your room is 38ºC, pulling it down to 34ºC still means it’s bloody hot. And also note that the Chillmax is physically quite small, so the cooling is very localised – it won’t cool an entire room down, and you have to have it less than a metre from your face to feel anything.The Hydro-Chill, antimicrobial filter is designed to hold water without allowing bacteria and mould to develop and grow. It’s even dishwasher-safe, so you can regularly sterilise it and then use it time after time.