Evaporative cooling doesn work when it gets really hot or muggy?
A How well the Evaporative cooler works is dependant on the outside temperature as well as humidity levels. The drier the air is, the better the cooling effect. On muggy days it is still better to have Evaporative cooling than to not have it, but its effectiveness will be slightly reduced on days of high humidity. On hot dry days, Evaporative cooling is quite simply the most efficient and effective way of cooling. Luckily in Melbourne we very rarely have days of high humidity.
