AMERICA'S HEATING & COOLING STORE™
EST. 2002
Home Air Products™
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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 25-43 of 43 results
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  • Williams 0743512

    7,400 BTU, 79% Efficiency, Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $889.99 Free Shipping
    Pre-order
    (3 Reviews)
  • Williams 1413822

    14,000 BTU, 65% AFUE, High Altitude (2,001 - 4,000'), Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $936.00 Free Shipping
    In Stock
    (1 Review)
  • Williams 1773511

    17,700 BTU, 82% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, Liquid Propane, 120 VAC

    $1,638.00 Free Shipping
    Pre-order
    (1 Review)
  • Williams 1773512

    17,700 BTU, 82% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, 120 VAC

    $1,638.00 Free Shipping
    In Stock
    (3 Reviews)
  • Williams 2203821

    22,000 BTU, 67% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $1,002.00 Free Shipping
    Pre-order
    (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

    $1,038.00 Free Shipping
    In Stock
    (1 Review)
  • Williams 2509821

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

    $735.60 Free Shipping
    In Stock
    (2 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

    $801.60 Free Shipping
    In Stock
    (2 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

    $858.00 Free Shipping
    In Stock
    (2 Reviews)
  • Williams 2903512

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

    $2,298.00 Free Shipping
    In Stock
    (3 Reviews)
  • Williams 3508231

    35,000 BTU, 75% AFUE, Forsaire Top-Vent Wall Furnace, Bottom Air Outlet, LP, 115 VAC

    $1,322.40 Free Shipping
    Not In Stock
    (0 Reviews)
  • Williams 3508232

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

    $1,322.40 Free Shipping
    Not In Stock
    (2 Reviews)
  • Williams 3509821

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

    $771.60 Free Shipping
    In Stock
    (2 Reviews)
  • Williams 4007331

    40,000 BTU, 80% AFUE, Direct-Vent Wall Furnace, Bottom Air Outlet, LP, 115 VAC

    $1,473.60 Free Shipping
    Not In Stock
    (2 Reviews)
  • Williams 5009821

    50,000 BTU, 71% AFUE, Monterey Plus 2-Sided Top-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $1,002.00 Free Shipping
    In Stock
    (2 Reviews)
  • Williams 5039822

    50,000 BTU, 71% AFUE, High Altitude (4,001 - 6,000') Monterey Plus 2-Sided Top-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $1,089.60 Free Shipping
    In Stock
    (2 Reviews)
  • Williams 5508232

    55,000 BTU, 76% AFUE, Top-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC

    $1,403.99 Free Shipping
    Not In Stock
    (2 Reviews)
  • Williams 5558232

    55,000 BTU, 76% AFUE, High Altitude (6,001 - 8,000'), Top-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC

    $1,620.00 Free Shipping
    In Stock
    (2 Reviews)
  • Williams 6508631

    65,000 BTU, 74% AFUE, Top-Vent Wall Furnace, Bottom Air Outlet, LP, 115 VAC

    $1,233.60 Free Shipping
    In Stock
    (2 Reviews)