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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 25-48 of 66 results
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  • Williams 2509622

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

    popular
    $ 574.99 Free Shipping
    (3 Reviews)
  • Williams 2509822

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

    $ 678.99 Free Shipping
    (0 Reviews)
  • Williams 2519622

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

    $ 747.99 Free Shipping
    (0 Reviews)
  • Williams 2539622

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

    $ 747.99 Free Shipping
    (0 Reviews)
  • Williams 2559622

    25,000, BTU, 67% AFUE, High Altitude (6,001 - 8,000'), Monterey Top-Vent Furnace, Top Air Outlet, Natural Gas/LP, 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/LP, 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 3003622

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

    $1,004.99 Free Shipping
    (0 Reviews)
  • Williams 3053622

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

    $1,004.99 Free Shipping
    (0 Reviews)
  • Williams 3508232

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

    popular
    $ 965.99 Free Shipping
    (0 Reviews)
  • Williams 3508632

    35,000 BTU, 75% AFUE, Top-Vent Furnace, Bottom Air Outlet, Natural Gas/LP, 115 VAC

    $ 843.99 Free Shipping
    (2 Reviews)
  • Williams 3509622

    35,000 BTU, 66% AFUE, Monterey Top-Vent Furnace, Top Air Outlet, Natural Gas/LP, No Electricity Required

    popular
    $ 569.99 Free Shipping
    (3 Reviews)
  • Williams 3509822

    35,000 BTU, 69% AFUE, Top-Vent Wall Furnace, Monterey Plus Top Air Outlet, Natural Gas/LP, No Electricity Required

    $ 712.99 Free Shipping
    (0 Reviews)
  • Williams 3518232

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

    $1,052.99 Free Shipping
    (0 Reviews)
  • Williams 3519622

    35,000 BTU, 66% AFUE, High Altitude (2,001 - 4,000'), Monterey Top-Vent Furnace, Top Air Outlet, Natural Gas/LP, No Electricity Required

    $ 815.99 Free Shipping
    (0 Reviews)
  • Williams 3519822

    35,000 BTU, 69% AFUE, High Altitude (2,001 - 4,000), Monterey Plus Top-Vent Wall Furnace, Top Air Outlet, Natural Gas/LP, No Electricity Required

    $ 780.99 Free Shipping
    (0 Reviews)
  • Williams 3538232

    35,000 BTU, 75% AFUE, High Altitude (4,001 - 6,000'), Forsaire Top-Vent Furnace, Bottom Air Outlet, Natural Gas/LP, 115 VAC

    $1,052.99 Free Shipping
    (0 Reviews)
  • Williams 3538632

    35,000 BTU, 75% AFUE, High Altitude (4,001 - 6,000'), Top-Vent Furnace, Bottom Air Outlet, Natural Gas / LP, 115 VAC

    $1,040.99 Free Shipping
    (0 Reviews)
  • Williams 3539622

    35,000 BTU, 66% AFUE, High Altitude (4,001 - 6,000'), Monterey Top-Vent Furnace, Top Air Outlet, Natural Gas/LP, No Electricity Required

    $ 815.99 Free Shipping
    (0 Reviews)
  • Williams 3539822

    35,000 BTU, 69% AFUE, High Altitude (4,001 - 6000'), Monterey Plus Top-Vent Wall Furnace, Top Air Outlet, Natural Gas/LP, No Electricity Required

    $ 780.99 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.