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.
60000 btu furnace coverage.
The btu refers to the heat output the furnace creates.
Even small heaters or air conditioners have high btu numbers.
Furnaces are rated on their btus of energy consumption not their btus of energy output.
Btu is a good way to compare the capacity of similarly priced units.
A furnace putting out 60 000 btu s per hour will probably handle the heating load even though your house is most likely uninsulated and in a very cold climate.
Typically whole house units range from 60 000 to 80 000 and above.
A more efficient furnace will output more btus of heat than a less efficient furnace with the same btu rating.
Shop from our huge selection of 60 000 btu furnaces below.
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.
Winchester 60 000 btu 80 efficient single stage forced air multi positional residential gas furnace with ecm blower motor model tm8e060a12mp11 1 223 08.
A heating degree day calculation using the month of july as a factor is a more precise way of estimating furnace size.
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.
90 000 btu input x 93 efficiency 83 700 btu actual output.
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.
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The average furnace has a btu rating of 80 000 to 100 000 btus.
Your heating bills will probably be sky high though.