But before we buy an 80 000 btu furnace there s furnace efficiency to consider as well.
60000 btu furnace square footage.
With these numbers you can calculate your furnace btu.
Btu charts furnace output and air conditioner size for a bungalow bungalow area sq ft furnace output btu hr air conditioner size ton built after year 1980 built before year 1980 built after year 1980 built before year 1980 up to readmore.
A more efficient furnace will output more btus of heat than a less efficient furnace with the same btu rating.
A mid sized home of 2 000 square feet would need approximately 50 000 to 60 000 btu to heat it properly.
2 000 square feet x 40 btus 80 000 btu output required thanks to the equation we know we need 80 000 btus of heat.
Furnaces are rated on their btus of energy consumption not their btus of energy output.
With a less efficient furnace operating at 80 percent efficiency this would require a.
On the other hand the colder zone 5 climates of the northeast upper midwest and pacific northwest demand 50 60 btus per square foot for maximum efficiency.