AMERICA'S HEATING & COOLING STORE™
EST. 2002
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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 1-24 of 44 results
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  • Rinnai EX38CTWP

    36,500 BTU Direct Vent, 82% Efficiency, Liquid Propane, White Wall Furnace

    Best Seller
    $1,944.39 Free Shipping
    In Stock
    (22 Reviews)
  • Rinnai EX38CTP

    36,500 BTU Direct Vent, 82% Efficiency, Liquid Propane Wall Furnace

    Best Seller
    $1,947.25 Free Shipping
    In Stock
    (12 Reviews)
  • Rinnai EX38CTWN

    38,400 BTU Direct Vent, 80% Efficiency, Natural Gas, White Wall Furnace

    $1,953.21 Free Shipping
    In Stock
    (22 Reviews)
  • Rinnai EX38CTN

    38,400 BTU Direct Vent, 80% Efficiency, Natural Gas Wall Furnace

    $1,949.50 Free Shipping
    In Stock
    (12 Reviews)
  • Williams 2509822

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

    $735.60 Free Shipping
    In Stock
    (2 Reviews)
  • Williams 3508632

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

    $1,026.00 Free Shipping
    Not In Stock
    (2 Reviews)
  • Williams 3509822

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

    $763.20 Free Shipping
    In Stock
    (2 Reviews)
  • Williams 5009822

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

    $925.19 Free Shipping
    In Stock
    (2 Reviews)
  • Williams 1403821

    14,000 BTU, 76% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $822.00 Free Shipping
    In Stock
    (1 Review)
  • Williams 1403822

    14,000 BTU, 65% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $822.00 Free Shipping
    In Stock
    (1 Review)
  • Williams 3003821

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

    Best Seller
    $978.00 Free Shipping
    In Stock
    (4 Reviews)
  • Williams 3003822

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

    $978.00 Free Shipping
    In Stock
    (1 Review)
  • Rinnai EX11CTP

    11,000 BTU Direct Vent, 82% Efficiency, Liquid Propane Wall Furnace

    $1,259.48 Free Shipping
    In Stock
    (22 Reviews)
  • Rinnai EX22CTP

    20,700 BTU Direct Vent, 82% Efficiency, Liquid Propane Wall Furnace

    $1,641.46 Free Shipping
    In Stock
    (22 Reviews)
  • Rinnai EX22CTN

    21,500 BTU Direct Vent, 81% Efficiency, Natural Gas Wall Furnace

    $1,658.76 Free Shipping
    In Stock
    (22 Reviews)
  • Rinnai EX22CTWP

    20,700 BTU Direct Vent, 82% Efficiency, Liquid Propane Wall Furnace

    $1,649.69 Free Shipping
    In Stock
    (22 Reviews)
  • Williams 2203822

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

    $972.00 Free Shipping
    In Stock
    (1 Review)
  • Williams 6007732

    60,000 BTU, 76% AFUE, Direct-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC with 9809 Vent Kit

    $1,403.99 Free Shipping
    Pre-order
    (9 Reviews)
  • Rinnai EX08CTP

    8,000 BTU Direct Vent, 83% Efficiency, Liquid Propane Wall Furnace

    $1,075.33 Free Shipping
    In Stock
    (22 Reviews)
  • Rinnai EX11CTN

    11,000 BTU Direct Vent, 81% Efficiency, Natural Gas Wall Furnace

    $1,272.81 Free Shipping
    In Stock
    (22 Reviews)
  • Rinnai EX17CTN

    16,700 BTU Direct Vent, 81% Efficiency, Natural Gas Wall Furnace

    $1,475.55 Free Shipping
    In Stock
    (22 Reviews)
  • Rinnai EX17CTP

    16,700 BTU Direct Vent, 82% Efficiency, Liquid Propane Wall Furnace

    $1,515.10 Free Shipping
    In Stock
    (22 Reviews)
  • Rinnai EX08CTN

    8,000 BTU Direct Vent, 82% Efficiency, Natural Gas Wall Furnace

    $1,105.95 Free Shipping
    In Stock
    (22 Reviews)
  • Rinnai EX22CTWN

    21,500 BTU Direct Vent, 81% Efficiency, Natural Gas Wall Furnace

    $1,661.20 Free Shipping
    Pre-order
    (22 Reviews)