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Dual Fuel Technology

The only thing I wish my house were different were fuel choice. My dad (in Europe actually) decided to build his house with forced air (very rare in Europe at the time). The neat part is he has duel fuel. He has a wood furnace and a natural gas furnace. Whichever furnace is active heats water that circulates through a heat exchanger in the duct work, heating the house. The benefit is he can heat with wood (about half the price) when he's home, and the system automatically switches over to the gas furnace when the wood is burnt up (good in the middle of the night on really cold nights, or when they are away from home).
Herbert G