What Size Furnace Do I Need?

What size furnace do I need?

What size furnace do I need? First, you need to determine the square footage of your home. To determine how big of a furnace you need, measure the length and width of each room in your home and multiply those measurements to determine the square footage of the house. Adjust your measurements accordingly since most furnace size charts assume the ceiling height to be eight feet. You should also not include rooms without ductwork or a sunroom.

Calculating the BTU output needed for your climate in the winter

To calculate the BTU output needed for your climate in winter, you must know its zone. For instance, the southern climate zone requires around 30 to 40 BTU per square foot of floor. You need about 40 to 45 BTU per square foot in the middle climate zone. In the northern climate zone, you need up to 60 BTU per square foot … read more