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algernon · 12-03-2010, 05:12 PM

You can try searching "Manual J" or "ASHRAE" to get the calculation for heat loss. You need to know your openings size, insulation levels, etc. Another method is to look inside the furnace for a label, as the BTU's should be listed.

12-03-2010, 05:12 PM	#9
algernon Lifetime Suspension Join Date: Apr 2006 Location: Removed by Mod Exp:	You can try searching "Manual J" or "ASHRAE" to get the calculation for heat loss. You need to know your openings size, insulation levels, etc. Another method is to look inside the furnace for a label, as the BTU's should be listed.