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11:09
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Originally posted by picastoc
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It is like a whirly bird mounted on the roof tiles. The whirly birds of the past just operated by wind so if the wind didn't blow, then no heat taken from the roof. Works on the principle that as heat rises from the house into the roof (vents installed for that purpose in house ceiling) the roof contains the heat and the whirlies remove the heat. Likely to be 60 degree C. on a hot day and outside it is cooler so heat leaves the roof cavity. A solar style whirly uses energy from the sun and drives a motor (size dependent on requirements). It can be fitted with a night kit which uses electricity to turn on the whirly (when no longer turning after dark) on a thermastat which is part of the solar whiz which kicks in when the temperature is still high in the roof itself.
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Ahhh...OK, I get it. I've seen plenty of them and folk I know swear by them. A great idea and also you can stop them from operating in the winter so that you can maintain a blanket of warm air...
