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re: strange home for sale..
27 feb 2001
wrote:
>...20'x25'... 1 window in each br and the kitchen. a picture window and
>1 window that opens in the living room. entire house is heated by a central
>round fireplace. cooking and hot water from propane... located in new
>hampshire... heating a house entirely with wood must get costly. does it?
if it's newish with 6" insulation and 8% of the floorspace as r2 windows,
its thermal conductance might be about 500ft^2/r20 = 25 btu/h-f for the
ceiling plus 40ft^2/r2 = 20 for the windows plus 680ft^2/r20 = 34 for the
walls plus 1achx20'x25'x8'/55 = 73 for 67 cfm of air leaks at 1 air change
per hour (which might be reduced with caulking), a total of 152 btu/h-f.
a house like that in concord, nh, with 7554 heating degree days, would need
24h/d(7554f-d)(152btu/h-f) = 27.6 million btu/year for heat, if kept at 65 f
for 24 hours per day, eg about 276 gallons of oil or 3 cords of wood, burned
in an efficient woodstove.
nick
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