Natural ventilation is the cheapest and most effective cooling method. Air conditioning is expensive to run and good passive design can eliminate the need for it. Ducted air-conditioning is the most expensive but split systems or wall units can be more cost-effective. Ceiling fans are a cheaper alternative.As a guide to calculating the size of air-conditioning needed to cool an area, allow 125 watt output per square metre of floor space in living ares and 80 watt output per square metre for bedrooms. Again, drafty windows or doors or large glazed areas can influence the outcome of the cooling.
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