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Calculation

BTU Requirement Calculation

For professional and site specific calculations, contact your The Cat Rental Store representative.

Cu. ft x (cu. ft. factor x insulation factor)= BTU required



1. Establish the number of cu. ft. to be heated:

Width x length x height of the room = number of cu. ft.

2. Establish the variation between the outdoors and indoors requires temperature:

-20C outdoor and +10C required indoor = variation of 30C.

3. Establish the cu. ft. factor:

Variation of 10C between outdoor and indoor required temperature = Factor 0.4
Variation of 20C between outdoor and indoor required temperature = Factor 0.6
Variation of 30C between outdoor and indoor required temperature = Factor 0.8
Variation of 40C between outdoor and indoor required temperature = Factor 1.0

4. Establish the insulation factor:

Insulated: Windows and walls installed = Factor 2.0
Fairly Insulated: Walls in position, no windows installed = Factor 4.0
Poorly Insulated: Few walls installed = Factor 7.0
Not Insulated: No walls and windows, only tarps = Factor 8.5

5. Calculation of BTU requirement:

Cu. ft x(cu. ft. factor x insulation factor) = BTU Required

Example:
  • Room dimension: 100' x 100' x 30' = 300,000 cu. ft.
  • Outdoor temperature of -20C goal of +10C indoor variation of 30C = Factor 0.8
  • Room is insulated = Factor 2.0

(100 x 100 x 30)x(0.8 x 2) = 480,000 BTU Required

View BTU Requirement Calculation from PDF