Re: Hypermiling the furnace
Well, there's quite a large volume of air down there, I'd hazard a guess at 20% of the house's total air volume. Previously it was basically at the same temperature as the rest of the house, due both to vicarious heating through the thin sheet metal walls of the ductwork and the abundance of air avenues between the two air spaces. Now the crawl space heating is more controlled. So far I've left the 2 outlets down there almost tight shut. The temperature difference is still not much, maybe 2~3 degrees centigrade. I've thought a bit about insulating the underside of floor, but think I'll leave it as is for now.
And the air coming out of the registers gets upwards of 10 degrees centigrade hotter now, so that's got to be good.
One thing I've got in back-of-mind: this duct insulation would also help if we were to upgrade our furnace to a system with air conditioning.
Last edited by Mendel Leisk : 03-03-2012 at 03:57 PM.
Reason: Resorted paragraphs (was jumbled), maybe a bit better now, LOL.