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re: time for house to heat up
19 feb 2002
raum pattikonda wrote:
>i have a new house in texas which takes more than 30 minutes for each
>degree of heating. when i leave i set the temperature at 66 and change
>to 72 when i come back. it takes 3 hours to rise 6 degrees. is this
>normal?
sounds slowish. seems to me this mostly depends on the furnace power
and thermal mass of the house. lower outdoor temps and less insulation
would also slow warming. a 100k btu/h furnace might initially warm a
10k btu/f house at 100k btu/h/(10k btu/f) = 10 f/h. concrete has about
25 btu/f-ft^3, 1/2" drywall has about 1 btu/f-ft^2, wood is about the
same as water by weight, 1 btu/f-lb...
baseboard or forced air seems better than hydronic slabs, since you can
feel fairly warm in the warm air, even before the house surfaces warm up.
nick
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