A furnace with 100 000 btu and an efficiency of 90 delivers 90 000 btus of heat to a home the remaining 10 is what is lost through the flue.
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The btu refers to the heat output the furnace creates.
Btu is a good way to compare the capacity of similarly priced units.
Furnaces are rated on their btus of energy consumption not their btus of energy output.
For example if a furnace is rated at 100 000 btus and is 80 efficient then the heat output will be 80 000 btus 100 000 x 8.
A more efficient furnace will output more btus of heat than a less efficient furnace with the same btu rating.
A heating degree day calculation using the month of july as a factor is a more precise way of estimating furnace size.
Natural gas for a furnace is priced by the therm or per 100 000 btus.
You might want to plan to invest in upgrading the insulation putting in new windows and weatherstripping around the doors.
The larger your home the higher the btu you will want because it means the heating or cooling unit will be able to produce more heated or cooled air.
The average furnace has a btu rating of 80 000 to 100 000 btus.
90 000 btu input x 93 efficiency 83 700 btu actual output.
Even small heaters or air conditioners have high btu numbers.
Winchester 60 000 btu 80 efficient single stage forced air multi positional residential gas furnace with ecm blower motor model tm8e060a12mp11 1 223 08.
For this example using an 80 efficient furnace the 1900 square foot home above would require a 90 000 btu input furnace that produces 72 000 btu s of heating which is close enough to the 76 000 btu s required using the climate heating factor.
Your heating bills will probably be sky high though.
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