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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 49-72 of 91 results
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  • Goodman GMH80403AN

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

    $ 542.99 Free Shipping

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH80403AX

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

    $ 589.00 Free Shipping

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH80603AN

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

    $ 555.99 Free Shipping

    Or as low as /mo

    (54 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
    $ 621.99 Free Shipping

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH80604BN

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

    $ 566.99 Free Shipping

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH80604BX

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

    $ 667.99 Free Shipping

    Or as low as /mo

    (54 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

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH80803BX

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

    $ 662.99 Free Shipping

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH80804BN

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

    $ 608.99 Free Shipping

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH80804BX

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

    popular
    $ 754.99 Free Shipping

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH80805CN

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

    $ 624.99 Free Shipping

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH80805CX

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

    $ 740.99 Free Shipping

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH81005CN

    100,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 2,000 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 651.99 Free Shipping

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH81005CX

    Low NOx Emission 100,000 BTU Furnace, 80% Efficiency, 2-Stage Burner, 2,000 CFM Multi-Speed Blower, Upflow/Horizontal Flow Application

    $ 734.99 Free Shipping

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH81205DN

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

    $ 662.99 Free Shipping

    Or as low as /mo

    (54 Reviews)
  • Goodman GMH81205DX

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

    $ 775.99 Free Shipping

    Or as low as /mo

    (54 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

    $ 590.99 Free Shipping

    Or as low as /mo

    (41 Reviews)
  • Goodman GMS80603AN

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

    $ 513.99 Free Shipping

    Or as low as /mo

    (41 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

    $ 579.99 Free Shipping

    Or as low as /mo

    (41 Reviews)
  • Goodman GMS80604BN

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

    $ 502.99 Free Shipping

    Or as low as /mo

    (41 Reviews)
  • Goodman GMS80604BX

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

    $ 599.99 Free Shipping

    Or as low as /mo

    (41 Reviews)
  • Goodman GMS80804BX

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

    $ 642.99 Free Shipping

    Or as low as /mo

    (41 Reviews)
  • Goodman GMS80805CN

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

    $ 557.99 Free Shipping

    Or as low as /mo

    (41 Reviews)
  • Goodman GMS80805CX

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

    $ 688.99 Free Shipping

    Or as low as /mo

    (41 Reviews)