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Old 11-20-13, 01:18 PM   #10
Daox
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I would think that if their house is that tight and insulation is that good, a 70% efficient furnace isn't going to make bills so high that spending thousands would be worth while. I'd probably ride it out with the current furnace and try to fix the ducting. This can be done relatively inexpensively if you DIY.
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