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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.

Square Footage

GO
This calculator is for estimating capacity only, and does not give exact equipment capacities for your home.
Displaying 25-48 of 92 results
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  • Williams 2213822

    22,000 BTU, 67% AFUE, High Altitude (2,001 - 4,000'), Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 988.99 Free Shipping
    (0 Reviews)
  • Williams 2233822

    22,000 BTU, 67% AFUE, High Altitude (4,001 - 6,000'), Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 988.99 Free Shipping
    (0 Reviews)
  • Williams 2253822

    22,000 BTU, 67% AFUE, High Altitude (6,001 - 8,000'), Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 988.99 Free Shipping
    (0 Reviews)
  • Williams 2509621A

    25,000 BTU, 67% AFUE, Monterey Top-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $ 691.99 Free Shipping
    (0 Reviews)
  • Williams 2509622A

    25,000 BTU, 67% AFUE, Monterey Top-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    popular
    $ 574.99 Free Shipping
    (3 Reviews)
  • Williams 2509821

    25,000 BTU, 71% AFUE, Monterey Plus Top-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $ 574.99 Free Shipping
    (0 Reviews)
  • Williams 2509822

    25,000 BTU, 71% AFUE, Monterey Plus Top-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 678.99 Free Shipping
    (0 Reviews)
  • Williams 2519622A

    25,000 BTU, 67% AFUE, High Altitude (2,001 - 4,000'), Monterey Top-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 769.99 Free Shipping
    (0 Reviews)
  • Williams 2519822

    25,000 BTU 71% AFUE, High Altitude (2,001 - 4,000'), Monterey Plus Top-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 747.99 Free Shipping
    (0 Reviews)
  • Williams 2539621A

    25,000 BTU, 67% AFUE, High Altitude (4,001 - 6,000'), Monterey Top-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $ 715.99 Free Shipping
    (0 Reviews)
  • Williams 2539622A

    25,000 BTU, 67% AFUE, High Altitude (4,001 - 6,000'), Monterey Top-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 769.99 Free Shipping
    (0 Reviews)
  • Williams 2539822

    25,000 BTU, 71% AFUE, High Altitude (4,001 - 6,000'), Monterey Plus Top-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 747.99 Free Shipping
    (0 Reviews)
  • Williams 2559621A

    25,000, BTU, 67% AFUE, High Altitude (6,001 - 8,000'), Monterey Top-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $ 564.99 Free Shipping
    (0 Reviews)
  • Williams 2559622A

    25,000, BTU, 67% AFUE, High Altitude (6,001 - 8,000'), Monterey Top-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 769.99 Free Shipping
    (0 Reviews)
  • Williams 2559822

    25,000 BTU, 71% AFUE, High Altitude (6,001 - 8,000'), Monterey Plus Top-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 747.99 Free Shipping
    (0 Reviews)
  • Williams 2903511

    29,000 BTU, 82% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, Liquid Propane, 120 VAC

    $1,795.99 Free Shipping
    (1 Review)
  • Williams 2903512

    29,000 BTU, 82% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, 120 VAC

    $1,795.99 Free Shipping
    (0 Reviews)
  • Williams 3003621

    30,000 BTU Direct-Vent Wall Furnace, 73% Efficiency, LP, Top Air Outlet, No Electricity Required

    $ 955.99 Free Shipping
    (0 Reviews)
  • Williams 3003622

    30,000 BTU, 66% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    popular
    $ 763.99 Free Shipping
    (2 Reviews)
  • Williams 3013622

    30,000 BTU, 65% AFUE, High-Altitude (2,001 - 4,000'), Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $1,004.99 Free Shipping
    (0 Reviews)
  • Williams 3053621

    30,000 BTU, 65% AFUE, High-Altitude (6,001 - 8,000'), Direct-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $ 990.99 Free Shipping
    (0 Reviews)
  • Williams 3053622

    30,000 BTU, 65% AFUE, High-Altitude (6,001 - 8,000'), Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $1,004.99 Free Shipping
    (0 Reviews)
  • Williams 3508231

    35,000 BTU, 75% AFUE, High Altitude (2,001 - 4,000'), Forsaire Top-Vent Wall Furnace, Bottom Air Outlet, LP, 115 VAC

    $ 999.99 Free Shipping
    (0 Reviews)
  • Williams 3508232

    35,000 BTU, 75% AFUE, High Altitude (2,001 - 4,000'), Forsaire Top-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC

    $ 965.99 Free Shipping
    (0 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.