Furnace Size Calculator

How to determine the correct furnace size for your home.

Furnace size is measured using the amount of heat it produces expressed in in BTU, which is short for British Thermal Unit.

The size of the furnace depends on the size and type  of your home:  bungalow, single, semi-detached or  townhome. It also  depends on whether it  was built before or after the year1980 as the regulations and standards have changed since then.

You can  use the from below to determine the optimal furnace size for your home: