Heat Loss Heat Gain Calculations

Heat Loss: A calculation which determines the maximum amount of heat (Btu/h or KW) that is required to condition a building based on the outdoor winter design temperature. The outdoor winter design temperatures are established in section 9.33.3.2 of the 2012 Ontario Building Code.

Heat Gain: A calculation which determines the optimum amount of cooling (Btu/h or Tons) that is required to best manage temperature (sensible) and humidity (latent) of a building including considerations for solar gains through windows and internal heat gains from people and appliances.


To start please fill out the form below and we will quote you a price. Once the form is filled in for the first address you may enter additional addresses. Our calculations come with a full warranty*; should the form require a revision at a later date this update is included in the original fee.

If you have any questions regarding this process or if your project is outside of Ontario, please call our office. 1-877-522-4822 x204.

*HLHG Calculations have a full warranty provided later revisions do not require us to start over due to radical design changes.