Design heat loss calculation

This calculates how much heat a particular home requires to maintain a 22°C indoor temperature on the coldest day of the year. A contractor can perform this calculation.

  • According to CSA Standards, a geothermal heat pump system must be sized to handle 70 to 105 per cent of the design heat loss of a home.
  • Systems sized to less than 100 per cent require an electric heater to make up the difference during the few coldest days of the year.
  • A system sized to 70 per cent costs less to purchase but has slightly higher annual energy costs, due to the auxiliary heater.
  • One benefit of a system sized to 70 per cent is that it more closely matches your home’s cooling load, providing more comfortable and efficient air conditioning during the summer.