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[quote=olddog;
A well installed system will have enough registers and big enough duct work that closing one register will have little impact on the furnace effeciency. Not all systems will be installed well and your experiance may vary.
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A well designed system will be designed to be at peak effeciency with all registers OPEN.Start closing registers and you alter(lower)the over all effeciency of the system
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The rest of the world can have their opinion about the United States just as soon as WE give it to them.
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