Heat Loss Calculator

*Please enter non-comma separated number values.
*Indicates a required field.

Building Size

Length

Width

Height

Volume

Sq. Footage

Temperature Differential

Inside Desired Temp.*

Outside Design Temp.*

Delta T

Building Materials

Wall 1

Size

U-factor (1/R)

Delta T

Heat Loss

Wall 2

Size

U-factor (1/R)

Delta T

Heat Loss

Wall 3

Size

U-factor (1/R)

Delta T

Heat Loss

Roof

Size

U-factor (1/R)

Delta T

Heat Loss

Doors

Size

U-factor (1/R)

Delta T

Heat Loss

Windows

Size

U-factor (1/R)

Delta T

Heat Loss

Skylights

Size

U-factor (1/R)

Delta T

Heat Loss

Slab Edge

Size

U-factor (1/R)

Delta T

Heat Loss

*Grouping walls, doors & window of a similar type as one is acceptable.
Use 1.2 for uninsulated doors and use .69 for insulated doors.
Use .81 for uninsulated slab edge and use .55 for insulated slab edge.

Natural Ventilation

Air Changes

Building Volume

U-factor

Delta T

Heat Loss

Special Considerations

Cold Mass

Weight (lbs.)

Specific Heat

Delta T

Dwell Hours

Heat Loss

Mechanical Ventilation (cfm)

Fan Size (cfm)

60 (min/hr)

Specific Heat

Delta T

Heat Loss

Total Heat Loss

Total Heat Loss After Infared Correction Factor

*Use this value for infrared design purposes