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:

Enter the information about your home:
Recommended BTU:?
Recommended Furnaces with 40K BTU Capacity

Amana Gas Furnace, AM9C960403BN, 40,000 BTU

Rheem Two-Stage Furnace R96VT0402317MSA 42,000 BTU (Installed)

Rheem Two-Stage Furnace R96VA0402317MSA 42,000 BTU (Installed)

Goodman, Gas Furnace, GM9C960403AN 40,000BTU

Recommended Furnaces with 60K BTU Capacity

Goodman, Gas Furnace, GM9C960603BN, 60,000 BTU

Amana Gas Furnace, Two-Stage 60K BTU (Including Installation*)

Rheem Two-Stage Furnace R96TA0602317MSA 60,000 BTU (Installed)

Rheem Two-Stage Furnace R96TA0702317MSA 70,000 BTU (Installed)

Rheem Two-Stage Furnace R96VA0702317MSA 70,000 BTU (Installed)

Rheem Two-Stage Furnace R96VA0602317MSA 60,000 BTU (Installed)

Modulating, Furnace 60K BTU AMVM970603BN 98 % AFUE (Including Installation*)

Recommended Furnaces with 80K BTU Capacity:

Amana Gas Furnace, Two-Stage 80K BTU (Including Installation*)

Amana Gas Furnace, Two-Stage 80K BTU (Including Installation*)

Rheem Two-Stage Furnace R96TA0852521MSB 85,000 BTU (Installed)

Rheem Two-Stage Furnace R96VA0852521MSB 85,000 BTU (Installed)

Modulating, Furnace 80K BTU AMVM970804CN 98 % AFUE(Including Installation*)

Goodman Gas Furnace, GM9C960804CN, 80,000 BTU

Goodman, Gas Furnace, GM9C960803BN, 80,000 BTU

Recommended Furnaces with 100K BTU Capacity

Amana Gas Furnace, Two-Stage 100K BTU (Including Installation*)

Rheem Two-Stage Furnace R96TA1002521MSA 100,000 BTU (Installed)

Rheem Two-Stage Furnace R96TA1152521MSA 115,000 BTU (Installed)

Rheem Two-Stage Furnace R96VA1002521MSA 100,000 BTU (Installed)

Rheem Two-Stage Furnace R96VA1152521MSA 115,000 BTU (Installed)

Modulating, Furnace 100K BTU AMVM971005CN 98 % AFUE (Including Installation*)

Goodman Gas Furnace, GM9C961005CN, 100,000 BTU

Goodman Gas Furnace 100K BTU, GMEC961004CN

Recommended furnaces with 120K BTU capacity

Goodman, Gas Furnace, GM9C961205DN, 120,000 BTU

Amana Gas Furnace, Two-Stage 120K BTU (Including Installation*)

Modulating, Furnace 120K BTU AMVM971205DN 98 % AFUE (Including Installation*)