If your house measures between 2 035 and 2 070 square feet a 80 000 btu per hour unit is best and more than 3 390 square feet requires a 120 000 btu per hour furnace.
80000 btu furnace how many square feet.
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.
However if a furnace is rated at 100 000 btus and is 92 efficient then the heat output will be 92 000 btus 100 000 x 92.
How many sq ft would 80000 btu s heat.
Another quick and easy way to estimate the number of btu s required is with this helpful chart.
And in cold climates multiply the square foot number by 30 40.
It may be worth considering a more efficient furnace as less energy will be used to.
A 70 000 btu furnace will heat a house 1600 square feet.
For example if you re trying to heat 1000 square feet in a cold climate 30 000 40 000 btu s will add significant warm air to your home.
80 000 btus british thermal units should heat up 3 500 square feet.