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FEBRUARY JLC 1999 Forced-air heating systems have a reputation for making some parts of the house too hot and others too cold. Even if the whole system is perfectly designed and installed, there are bound to be complaints. The right temperature for watching TV downstairs might be way too hot for sleeping upstairs. Until fairly recently, the luxury of having different thermostats for different parts of the house has been the domain of hot water heating systems — zoning forced air simply wasn't practical or cost effective. Today, advances in both electronics and furnace technology have made forced-air zoning a reality for new installations and upgrades alike. How Zoning Works The principle behind zoned forced air