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Natural Gas / LP Wall Furnaces

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.
GO
This calculator is for estimating capacity only, and does not give exact equipment capacities for your home.
Displaying 25-33 of 33 results
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  • Williams 3509622

    35,000 BTU Top-Vent Furnace, 74% Efficiency, Natural Gas / LP, Top Air Outlet, No Electricity Required

    popular
    $ 570.99 Free Shipping
    (3 Reviews)

  • Williams 4007332

    40,000 BTU Direct-Vent Furnace, 80% Efficiency, Natural Gas / LP Convertible,Bottom Air Outlet, 115 VAC, Intermittent Pilot

    $1,187.99 Free Shipping
    (0 Reviews)

  • Williams 4007732

    40,000 BTU Direct-Vent Furnace, 75% Efficiency, Natural Gas / LP,Bottom Air Outlet, 115 VAC, Standing Pilot

    popular
    $ 980.99 Free Shipping
    (3 Reviews)

  • Williams 5008632

    50,000 BTU Top-Vent Furnace, 74% Efficiency, Natural Gas / LP, Bottom Air Outlet, 115 VAC, Standing Pilot

    popular
    $ 963.99 Free Shipping
    (2 Reviews)

  • Williams 5009622

    50,000 BTU Top-Vent Furnace, Dual-Sided, 77% Efficiency, Natural Gas / LP, Top Air Outlet, No Electricity Required

    popular
    $ 717.99 Free Shipping
    (3 Reviews)

  • Williams 5507332

    55,000 BTU Direct-Vent Furnace, 76% Efficiency, Natural Gas / LP Convertible, Bottom Air Outlet, 115 VAC, Intermittent Ignition

    $1,341.99 Free Shipping
    (0 Reviews)

  • Williams 5508232

    55,000 BTU Top-Vent Furnace, 76% Efficiency, Natural Gas, Bottom Air Outlet, 115 VAC, Electronic Ignition

    $1,194.99 Free Shipping
    (2 Reviews)

  • Williams 6007732

    62,000 BTU Direct-Vent Furnace, 76% Efficiency, Natural Gas / LP, Bottom Air Outlet, 115 VAC, Standing Pilot

    $ 996.99 Free Shipping
    (0 Reviews)

  • Williams 6508632

    65,000 BTU Top-Vent Furnace, 74% Efficiency, Natural Gas / LP Convertible, Bottom Air Outlet, 115 VAC, Standing Pilot

    $ 908.99 Free Shipping
    (2 Reviews)

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.