Simplified Load Calculation For Residential Garages

    The capacity or BTU input of the radiant infrared tube-heating system depends upon the estimated heat loss. Our program needs to learn some basic building specifications and the desired indoor temperature.

    For optimum performance of this calculator please use Mozilla or Chrome browsers.

    Tell us about your average winter temperatures and what temperature you want to keep your garage at

    Temperature Information
    Desired
    Inside Temp.
    		F

    Outside temperature design selection map Select Your Zone
    from the map
     2
     3
     4
     5
     6
     7
     8
     9
    10

    Residential Garage Specifications

    Insulation

      How well is the building insulated?

                

    Selecting the from the drop down above it will pre-populate the U-Factors below. You can make changes to the U Factors as each building is not the same.

    To calculate the U Factor from and R Value simply divide 1 by the R Value.
    (1/ "R-VALUE" = U Value)

    "Excellent" Insulation Assumes the following with drywalled interior:
    Walls: Insulated with to a R-19 rating
    Roof: Insulated with to a R-30 rating
    Garage Door: Insulated with to a R-15 rating
    Windows: Double pane with to a R-5 rating

    "Average" Insulation Assumes the following with drywalled interior:
    Walls: Insulated with to a R-11 rating
    Roof: Insulated with to a R-11 rating
    Garage Door: Insulated with to a R-6 rating
    Windows: Double pane     with to a R-2 rating

    "Poor" Insulation Assumes the following with an unfinished interior:
    Walls: Wood Walls NO Insulation
    Roof: Wood roof with Asphalt shingles and NO Insulation
    Garage Door: uninsulated Steel garage door
    Windows: Single Pane     with to a R-1 rating
    Exposed Walls
    Total Exposed Lineal Feet
    (Do Not Use Comma's)

    Ft.
    Wall Height
    Ft.
    U Factor of Exposed Walls
    (1/ "R-VALUE" = U Value)
    Exterior Windows
    Total Area of Windows

    Sq. Ft.
    U Factor of Exterior Windows

    (1/ "R-VALUE" = U Value)
    Exterior Doors
    Total Area of Doors
    (Do Not Use Comma's)

    Sq. Ft.
    U Factor of Exterior Doors

    (1/ "R-VALUE" = U Value)
    Roof
    Total Area of the Roof
    (Do Not Use Comma's)

    Sq. Ft.
    U Factor of Roof

    (1/ "R-VALUE" = U Value)
    Floor
    Total Lineal Feet of the Floor

    Ft.
    U Factor of Floor

    (1/ "R-VALUE" = U Value)
    Time (Hours) to heat up your cars-
    As you bring in your cars from the cold winter weather they will take a little time to heat up. How fast do you want to be able to heat your cars up when they are brought in from the cold?
    1 2 4 6 8 12 24
    How Many Car Garage Do You Have?
    1 2 3 4 5 6

    Total Heat Loss **

    Click here to calculate Total Estimated Heat Loss

    Note: If you make additional changes to the inputs above
    be sure to click the calculate button to update the heat loss calculation.
    Total Estimated Heat Loss
    		BTU's

    (As a "rule of thumb," double equipment size for wood or dirt floors)
    **Note: The heat loss calculation program is derived from data supplied by the user, and our heat loss is intended to provide estimates only. Estimated assumptions are that up to 2 cars with an air change rating of 0.5 AC/hour.

    Here are some common R-value of Materials and Depths
    To calculate the U Factor from and R Value simply divide 1 by the R Value.
    (1/ "R-VALUE" = U Factor)
    Material  
    3 1/2"
    5 1/4"
    10"
    12"
    15"
    Fiberglass (batt)  
    10.8
    16.3
    31.0
    37.2
    46.5
    Fiberglass blown (attic)  
    7.7
    11.5
    22.0
    26.4
    33.0
    Fiberglass blown (wall)  
    12.9
    19.4
    37.0
    44.4
    55.5
    Mineral Wool (batt)  
    10.8
    16.3
    31.0
    37.2
    46.5
    Mineral Wool blown (attic)  
    10.8
    16.3
    31.0
    37.2
    46.5
    Mineral Wool blown (wall)  
    10.8
    16.3
    31.0
    37.2
    46.5
    Cellulose blown (attic)  
    11.2
    16.8
    32.0
    38.4
    48.0
    Cellulose blown (wall)  
    13.3
    19.9
    38.0
    45.6
    57.0
    Polystyrene Board  
    13.3
    19.9
    38.0
    45.6
    57.0
    Polyurethane Board  
    19.2
    28.9
    55.0
    66.0
    82.5
    Polyisocyanurate (foil-faced)  
    18.2
    29.4
    56.0
    67.2
    84.0
    Open Cell Spray Foam  
    12.2
    18.4
    35.0
    42.0
    52.5
    Closed Cell Spray Foam  
    21.0
    31.5
    60.0
    72.0
    90.0


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