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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 114 results
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  • Williams 1773512

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

    $1,276.99 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 2203821

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

    $ 756.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 2203822

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

    $ 697.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 2213821

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

    $ 793.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • 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

    $ 766.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 2233821

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

    $ 793.99 Free Shipping

    Or as low as /mo

    (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

    $ 766.99 Free Shipping

    Or as low as /mo

    (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

    $ 766.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 2509821

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

    $ 551.99 Free Shipping

    Or as low as /mo

    (1 Review)
  • Williams 2509822

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

    $ 539.99 Free Shipping

    Or as low as /mo

    (1 Review)
  • 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

    $ 616.99 Free Shipping

    Or as low as /mo

    (1 Review)
  • Williams 2539821

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

    $ 580.99 Free Shipping

    Or as low as /mo

    (1 Review)
  • 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

    $ 616.99 Free Shipping

    Or as low as /mo

    (1 Review)
  • 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

    $ 597.99 Free Shipping

    Or as low as /mo

    (7 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

    $ 616.99 Free Shipping

    Or as low as /mo

    (1 Review)
  • Williams 2903511

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

    $1,782.99 Free Shipping

    Or as low as /mo

    (1 Review)
  • Williams 2903512

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

    $1,782.99 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 3003821

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

    $ 755.99 Free Shipping

    Or as low as /mo

    (1 Review)
  • Williams 3003822

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

    $ 791.99 Free Shipping

    Or as low as /mo

    (0 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

    $ 775.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 3033821

    30,000 BTU Direct-Vent Wall Furnace, 73% Efficiency, High Altitude (4,001 - 6,000'), LP, Top Air Outlet, No Electricity Required

    $ 831.99 Free Shipping

    Or as low as /mo

    (1 Review)
  • Williams 3033822

    30,000 BTU, 66% AFUE, High Altitude (4,001 - 6,000'), Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 831.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 3053821

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

    $ 794.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 3053822

    30,000 BTU, 66% AFUE, High Altitude (6,001 - 8,000'), Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 831.99 Free Shipping

    Or as low as /mo

    (0 Reviews)