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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 97 results
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  • Goodman GMS80403AN

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

    $ 499.99 Free Shipping

    Or as low as /mo

    (38 Reviews)
  • Goodman GDH80403AN

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

    $ 530.99 Free Shipping

    Or as low as /mo

    (11 Reviews)
  • Goodman GDH80603AN

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

    $ 568.99 Free Shipping

    Or as low as /mo

    (11 Reviews)
  • Goodman GMSS960805CN

    80,000 BTU Furnace, 96% Efficiency, Single-Stage Burner, 2000 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 936.99 Free Shipping

    Or as low as /mo

    (36 Reviews)
  • Goodman GMEC960402BN

    40,000 BTU Furnace, 96% Efficiency, 2 Stage Burner, 800 CFM, Multi-Speed Upflow/Horizontal Flow Application

    $ 887.99 Free Shipping

    Or as low as /mo

    (10 Reviews)
  • Amana AMH80403AX

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

    $ 614.99 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Amana AMH80603AX

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

    $ 648.99 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Amana AMH80804BX

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

    $ 730.99 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Amana AMH80805CX

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

    $ 733.99 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Comfort-Aire GDD80A054A3XE

    54,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 1,200 CFM Multi-Speed Blower, Dedicated Downflow Application

    $ 612.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GDD80A072B4XE

    72,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 1,600 CFM Multi-Speed Blower, Dedicated Downflow Application

    $ 687.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GDD80A090B4XE

    90,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 1,600 CFM Multi-Speed Blower, Dedicated Downflow Application

    $ 734.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GDD80A108C5XE

    108,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 2,000 CFM Multi-Speed Blower, Dedicated Downflow Application

    $ 666.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GDD80A126D5XE

    126,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 2,000 CFM Multi-Speed Blower, Dedicated Downflow Application

    $ 736.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GDD95A054B4XE

    54,000 BTU Furnace, 95% Efficiency, 1-Stage Burner, 1,600 CFM Fixed Speed PSC, Dedicated Downflow Application

    $ 975.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GUH80A045A3XE

    45,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 1,200 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 523.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GUH80A054A3XE

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

    $ 545.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GUH80A072B4XE

    72,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 1,600 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 631.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GUH80A072C5XE

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

    $ 593.99 Free Shipping

    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

    $ 600.99 Free Shipping

    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

    $ 632.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GUH80A108C5XE

    108,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 2,000 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 633.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GUH80A126D5XE

    126,000 BTU Furnace, 80% Efficiency, 1-Stage Burner, 2,000 CFM Multi Speed Blower, Upflow/Horizontal Flow Application

    $ 671.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Comfort-Aire GUH95A038B4XE

    38,000 BTU Furnace, 95% Efficiency, 1-Stage Burner, 1,600 CFM Fixed Speed PSC, Upflow/Horizontal Flow Application

    $ 839.99 Free Shipping

    Or as low as /mo

    (0 Reviews)