Just like Dyson’s Air Multiplier fans, the Hot + Cool does a respectable job of pushing air out into a room, and does so at temperatures up to 37ºC. Like any portable heater, it’s most suited to smaller rooms, with best results achieved in enclosed spaces – so keep any doors closed to retain the warm air. The heater fan is incredibly quick to warm up, and in less than a minute we had hot air blowing in our general direction.
The heater lacks a timer – so you can’t set it to warm up a room before you get out of bed in the morning – but it does put itself on hold once the thermostat detects that ambient air has reached the desired temperature.
While some heaters can emit a strange smell during operation, caused by dust burning on the heating element, Dyson was pretty specific about this not being a problem with its Hot + Cool. Its elements apparently do not heat beyond 200ºC, making it harder for dust particles to burn. We did not a detect any smells during our trial period.
We have no complaints about the heat levels or force at which the Dyson disperses warmed air, but the fan can be overly noisy, especially at higher speeds. It’s not the whirring, mechanical sound that accompanies most other heaters, mind you, but rather the sound of air rushing at high speed. If this is likely to bother you, a radiator or bar heater may be the way to go.
Also, the name “Hot + Cool” is a bit of a half-truth. While this Dyson generates hot air, its motor is unable to speed up the air passing through its fan in the same way the Air Multiplier does. So while it can deliver cool air, it won’t deliver a breeze at temperatures to make you forget about Summer. In short, it’s not as effective as a dedicated cooling appliance, so put away some pennies for one of these when November comes around.
One the matter of price, the Hot + Cool costs more than $500, making it one of the most expensive portable heaters you can buy.