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Is it expensive to switch from an 80% to a 90% efficient furnace, to comply with the new mandate?
I'm told by some HVAC companies via mail flyers and websites (example) that it may be very expensive to retrofit new PVC pipes to update an 80% efficient furnace to a 90% one. Therefore, the logic ...
Dec 20 '12 at 22:17
Two Bit Gangster
newest retrofit pvc questions feed
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