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10-04-2012, 07:55 AM #14
10-04-2012, 09:01 AM #15Banned
- Join Date
- Feb 2012
Next house will be built the way I want it, 2x10 walls, radiant floor heat, an air source HP sized to handle down to 10°F or so, and enough south facing glass that the HP won't run much when the sun is shining. Probably won't bother with an LP boiler, just use electric and/or wood for backup.
My DIY Manual J came out around 39,000. I'm shooting for 33k after tripling the ceiling insulation and insulating the exposed part of the basement with 1" foam board.
I got a GMH950453BX, which puts out around 39k on propane.
If the smallest furnaces can handle a 1970s 30x40 ranch in Michigan, why don't they make smaller furnaces for people with modern airtight homes in Arkansas?
I saw a thread where a fellow with a 1400sqft new build in a warmer clime (Missouri?) thought his builder should put in a 90k instead of 60k furnace. I figured my 46k would be too big in his house.
10-04-2012, 01:03 PM #16Regular Guest
- Join Date
- Jun 2001
- Moore, Oklahoma
10-04-2012, 02:57 PM #17
IF I didn't already have a gas line going to my attic and had easy piping access, I might have considered a hydronic air handler and combi boiler for my upstairs in my home with a heat pump. But it made more sense to repalce hte furance. But not I have a 2 stage 60k BTU furnace where my heat loss is <30k BTU. SO low stage is still oversized at 37k BTU.