Calculation tools

BTU needs Energy

cu. ft.
(cu. ft. factor × insulation factor)

=

BTU required

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

 ×
×
=
2
Determine the variation between the outdoor and indoor required temperatures:

outdoor temperature 		×
required indoor temperature 		=
variation of
3
Determine the factor with the following list, starting with the variation determined at point 2:
Variation of between outdoor and
indoor required temperatures		 Factor
4
Determine the insulation factor:
  • Factor 2.0
  • Factor 4.0
  • Factor 7.0
  • Factor 8.5
5
Calculation of BTU requirements:

 ×
×
=
Example :
  • Room dimensions: 100' × 100' × 30' = 300 000 cu. ft;
  • Outdoor temperature of -20 °C goal of +10 °C indoor variation of 30 °C = Factor 0.8;
  • Room is insulated = Factor 2.0.
(100 × 100 × 30) × (0.8 × 2) = 480 000 BTU required
Hewitt Atlantic CAT
Hewitt
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