Download this Chart

How to use the Calculator

Step One: Print out this calculator

Step two: Measure the area to be air conditioned / heated, including windows, doors etc and what direction they face.

Step three: Write the measured value into the appropriate line of column A

Step four: Multiply the value in column A by the most appropriate multiplying factor in column B and write your answer in the Cooling load column.

Step five: Add up the totals in the Cooling load column to get the Sensible cooling load (W)

Step six: Multiply the sensible cooling load x 1.3 to get the required thermal cooling capacity.

Step seven: Select a heat pump to match or better the required thermal cooling capacity. 

Cooling Load Check Figures (watts/m2 floor area)

  • Apartments 120
  • Food Store 160
  • Banks 175
  • Hairdressers 215
  • Library 150
  • Cafeteria 350
  • Mail 135
  • Classroom 95
  • Medical Off 185
  • Clothing Store165
  • Office Gen 170
  • Medical Off 185
  • Computer Room 480
  • Office 100
  • Conference Room 275
  • Restaurant 330
  • Dept Store 150
  • Theatre 280

Cooling Load Check Figures (watts/m2 floor area)

The above calculator is to be used as a guide only.  We strongly recommend that you contact a qualified installer to carry out a heat load calculation and offer you a free, no obligation quotation before proceeding. Please note there are many variables that could affect the results of a heat load calculation, your qualified installer will be able to advise you of these variables.