What this means is that vents that seem to never blow air with your inefficient old furnace will all of a sudden blow air after the new Rheem furnace equipped with the GE ECM motor is installed. You know, for some reason all of your ductwork is sized correctly, but the return leg that is attached to your furnace is severly undersized and is acting like a choke point. You know, your ducts amazingly enough are sized correctly, but all of the air is escaping into unfinished portions of the house because the construction of the ductwork is very loose. Two smaller systems will actually cost you less on the utility bill to operate and will provide greater comfort. You know, your homebuilder really got cheap and should have installed 2 seperate systems considering that your home is 3600 Sq/ft. Shutting down too many supply registers usually causes more harm than good by creating pressurization problems with the overall duct system, that in an extreme case can actually cause your furnace
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