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Bottom Air Outlet, Natural Gas / LP

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 48 results
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  • Williams 3508231

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

    $1,059.00 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 3508232

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

    $1,059.00 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 3508631

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

    $ 860.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 3508632

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

    $ 860.40 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 3518231

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

    $1,129.80 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 3518232

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

    $1,129.80 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 3518631

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

    $ 988.99 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 3518632

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

    $1,081.99 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 3538232

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

    $1,129.80 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 3538631

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

    $1,081.99 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 3538632

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

    $ 931.20 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 3558232

    35,000 BTU, 75% AFUE, High Altitude (6,001 - 8,000'), Forsaire Top-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC

    $1,129.80 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 3558631

    35,000 BTU, 75% AFUE, High Altitude (6,001 - 8,000'), Top-Vent Wall Furnace, Bottom Air Outlet, LP, 115 VAC

    $1,081.99 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 3558632

    35,000 BTU, 75% AFUE, High Altitude (6,001 - 8,000'), Top-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC

    $1,081.99 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 4007331

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

    $1,225.20 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 4007332

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

    $1,225.20 Free Shipping

    Or as low as /mo

    (7 Reviews)
  • Williams 4007731

    40,000 BTU, 75% AFUE, Direct-Vent Wall Furnace, Bottom Air Outlet, LP, 115 VAC

    $1,019.99 Free Shipping

    Or as low as /mo

    (6 Reviews)
  • Williams 4007732

    40,000 BTU, 75% AFUE, Direct-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC

    $ 999.60 Free Shipping

    Or as low as /mo

    (7 Reviews)
  • Williams 4057731

    40,000 BTU, 75% AFUE, High Altitude (6,001 - 8,000'), Direct-Vent Wall Furnace, Bottom Air Outlet, LP, 115 VAC

    $1,139.99 Free Shipping

    Or as low as /mo

    (6 Reviews)
  • Williams 5008631

    50,000 BTU, 74% AFUE, Top-Vent Wall Furnace, Bottom Air Outlet, LP, 115 VAC

    $ 969.60 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 5008632

    50,000 BTU, 74% AFUE, Top-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC

    $ 969.60 Free Shipping

    Or as low as /mo

    (2 Reviews)
  • Williams 5018631

    50,000 BTU, 74% AFUE, High Altitude (2,001 - 4,000'), Top-Vent Wall Furnace, Bottom Air Outlet, LP, 115 VAC

    $1,040.40 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 5018632

    50,000 BTU, 74% AFUE, High Altitude (2,001 - 4000'), Top-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC

    $1,040.40 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 5038631

    50,000 BTU, 74% AFUE, High Altitude (4,001 - 6,000'), Top-Vent Wall Furnace, Bottom Air Outlet, LP, 115 VAC

    $1,040.40 Free Shipping

    Or as low as /mo

    (0 Reviews)