Original message
| rollerbones
 |  "Furnace size"
, posted Sat 30 Aug 13:13  
I have a new house being built. Right not the furnace is a 92% with 82,300BTU output. The house is 2800sqft with 2 floors and a basement and has central air in Ohio.
My question is that other houses that are being built at the same time are getting a furance with 103,500btu outputs. and 1 of them is 700sqft smaller. Does this sound correct?
I just want to make sure everything is correc before signing off.
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Replies:
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| yuri
| "Re(1):Furnace size" , posted Sat 30 Aug 14:43
There is only 1 scientific/accurate way to know and that is to do a heat loss calculation. Try this one:
http://www.hvac.cc/
Also it depends on how much insulation, window quality R value, wall thickness R value, basement insulation the other homes have as compared to yours to choose a size.
Yuri
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| | rollerbones
| "Re(2):Furnace size" , posted Sat 30 Aug 15:34
Thanks but I not paying for a program I would use one time.
I will just call someone if there is no other way.
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| | Hube
| "Re(3):Furnace size" , posted Sun 31 Aug 10:31:
To properly (no guessing or rule of thumb) calculate the size of heat and cooling (btu's) a heat gain/loss sheet must be done.
This calculation will take into consideration the average temperatures in the summer/ winter, orientation, R value of insulation type of construction, amount of windows, and other thermal items,etc,etc.
A manual J is needed to calculate heat loss/gain. A manual D is needed to calculate proper duct sizes, in most areas of N America.
Contact the builder to see if these calculations were actually done. I would think they were.
[this message was edited by Hube on Sun 31 Aug 10:35] |
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