cooling in Canada, and some new homes even come equipped with them. Before the explosion in energy-gobbling central air conditioners, it was standard practice to keep windows closed during hot days, and open them at night. A whole-house fan boosts the speed of evening cool-down at a fraction of the energy consumption of air conditioning. With Ontario facing the prospect of electricity overload this summer, energy-frugal home features like whole-house fans make more sense than another nuclear power plant or two. One line of whole-house fans available in Canada is made by Broan (800-558-1711)