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My house is 1700 sq. ft. I only use about 650 of it. The rest is closed off and kept at 50 all winter long. Back in about 1990 I installed a new heating system. I installed it with 3 zones , one of which is the area I live in , the other two zones is the areas I close off. I remember the gas company guy telling me what a waste to have 3 zones back when I did it.. Guess he wasn't very good at looking ahead at fuel costs. The 3 zones vs 1 zone as originally built has saved me about 4 times the cost of the entire heating system , including the whole furnace , registers and all controls, over the 20 years since I did it. Doing the whole thing myself also saved about half the total cost in the first place. The other good thing is that the fuel just keeps going up and so the annual savings actually increase every year.
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