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Overstock Furnace Special!

BTU CALCULATOR
BTU CALCULATOR

BTU stands for "British Thermal Unit" and measures the heating or cooling capacity of a furnace or air conditioning unit. Enter your homes square footage to see how many BTU's are required to adequately heat or cool it.

Enter the square footage of your home (or room) and press Go.

Square Footage

GO
This calculator is for estimating capacity only, and does not give exact equipment capacities for your home.
Displaying 1-24 of 65 results
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  • Comfort-Aire GUH80A054A3XE

    54,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 1,200 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 589.99 Free Shipping
    In Stock

    Or as low as /mo

    (0 Reviews)
  • Goodman GDH80603AN

    60,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 1,200 CFM Multi-Speed Blower, Dedicated Downflow Application

    $ 577.99 Free Shipping
    In Stock

    Or as low as /mo

    (14 Reviews)
  • Goodman GDH80603AX

    Low NOx Emission 60,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 1,200 CFM Multi-Speed Blower, Dedicated Downflow Application

    $ 648.99 Free Shipping
    Not In Stock

    Or as low as /mo

    (14 Reviews)
  • Goodman GDS80403AN

    40,000 BTU Furnace, 80% Efficiency, Single-Stage Burner, 1,200 CFM Multi-Speed Blower, Downflow Application

    $ 504.00 Free Shipping
    Not In Stock

    Or as low as /mo

    (22 Reviews)
  • Goodman GDS80603AN

    60,000 BTU Furnace, 80% Efficiency, Single-Stage Burner, 1,200 CFM Multi-Speed Blower, Downflow Application

    $ 537.99 Free Shipping
    In Stock

    Or as low as /mo

    (22 Reviews)
  • Goodman GDS80804BN

    80,000 BTU Furnace, 80% Efficiency, Single-Stage Burner, 1,600 CFM Multi-Speed Blower, Downflow Application

    $ 573.00 Free Shipping
    Not In Stock

    Or as low as /mo

    (22 Reviews)
  • Goodman GMH80403AN

    40,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 1,200 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 525.99 Free Shipping
    In Stock

    Or as low as /mo

    (62 Reviews)
  • Goodman GMH80603AN

    60,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 1,200 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 551.00 Free Shipping
    In Stock

    Or as low as /mo

    (62 Reviews)
  • Goodman GMH80604BN

    60,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 1,600 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 541.00 Free Shipping
    Not In Stock

    Or as low as /mo

    (62 Reviews)
  • Goodman GMH80803BN

    80,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 1,200 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 584.99 Free Shipping
    In Stock

    Or as low as /mo

    (62 Reviews)
  • Goodman GMH81205DN

    120,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 2,000 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 751.00 Free Shipping
    In Stock

    Or as low as /mo

    (62 Reviews)
  • Goodman GMS80403AN

    40,000 BTU Furnace, 80% Efficiency, Single-Stage Burner, 1,200 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 507.99 Free Shipping
    In Stock

    Or as low as /mo

    (44 Reviews)
  • Goodman GMS80403AX

    Low NOx Emission 40,000 BTU Furnace, 80% Efficiency, Single-Stage Burner, 1,200 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 594.99 Free Shipping
    In Stock

    Or as low as /mo

    (44 Reviews)
  • Goodman GMS80603AX

    Low NOx Emission 60,000 BTU Furnace, 80% Efficiency, Single-Stage Burner, 1,200 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 600.99 Free Shipping
    Not In Stock

    Or as low as /mo

    (44 Reviews)
  • Goodman GMS80604BN

    60,000 BTU Furnace, 80% Efficiency, Single-Stage Burner, 1,600 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 538.99 Free Shipping
    In Stock

    Or as low as /mo

    (44 Reviews)
  • Comfort-Aire GUH80A072C5XE

    72,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 2,000 CFM Fixed Speed PSC Blower, Upflow/Horizontal Flow Application

    $ 662.99 Free Shipping
    In Stock

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GUH80A090B4XE

    90,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 1,600 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 648.99 Free Shipping
    In Stock

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GUH80A090C5XE

    90,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 2,000 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 690.99 Free Shipping
    In Stock

    Or as low as /mo

    (0 Reviews)
  • Goodman GDH80403AN

    40,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 1,200 CFM Multi-Speed Blower, Dedicated Downflow Application

    $ 619.99 Free Shipping
    In Stock

    Or as low as /mo

    (14 Reviews)
  • Goodman GDH80403AX

    Low NOx Emission 40,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 1,200 CFM Multi-Speed Blower, Dedicated Downflow Application

    $ 619.99 Free Shipping
    In Stock

    Or as low as /mo

    (14 Reviews)
  • Goodman GDH80804BN

    80,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 1,600 CFM Multi-Speed Blower, Dedicated Downflow Application

    $ 613.00 Free Shipping
    In Stock

    Or as low as /mo

    (14 Reviews)
  • Goodman GDS80603AX

    Low NOx Emission 60,000 BTU Furnace, 80% Efficiency, Single-Stage Burner, 1,200 CFM Multi-Speed Blower, Downflow Application

    $ 621.99 Free Shipping
    In Stock

    Or as low as /mo

    (22 Reviews)
  • Goodman GDS81005CN

    100,000 BTU Furnace, 80% Efficiency, Single-Stage Burner, 2,000 CFM Multi-Speed Blower, Downflow Application

    $ 690.99 Free Shipping
    In Stock

    Or as low as /mo

    (22 Reviews)
  • Goodman GMH80603AX

    Low NOx Emission 60,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 1,200 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    popular
    $ 615.99 Free Shipping
    In Stock

    Or as low as /mo

    (62 Reviews)