The EnerGuide rating

An EnerGuide rating is a standard measure of a home's energy performance. Ratings are calculated by professional EnerGuide rating service energy advisors from information collected during the analysis of building plans and the results of the blower door test performed once the house has been built.

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The final EnerGuide rating for a new home shows your customer (and future buyers of the home) exactly how energy efficient it is. It also shows that you have met the commitment you made to your customer to provide the specified level of energy efficiency in the home.

The home's energy efficiency level is rated on a scale of 0 to 100. A rating of 0 represents a home with major air leakage, no insulation and extremely high energy consumption. A rating of 100 represents a house that is airtight, well insulated, sufficiently ventilated and requires no purchased energy on an annual basis

A Guide to EnerGuide Ratings

Typical Energy Efficiency Ratings
Type of House Rating
New House build to building code standards 65-72
New house with some energy-efficiency improvements 73-79
Energy-efficient new house 80-90
House requiring little or no purchased energy 91-100

A rating of 80 or higher is NRCan's goal for all new housing.

The rating is determined y collecting detailed information about the home's energy systems, construction materials and assembly and inputting that information into an energy simulation modeling program developed by Natural Resources Canada. To factor out the influence of occupants habits (i.e., to measure the way the house itself uses energy, not the energy-using habits of its occupants), standard operating conditions are used in the rating.

They assume:

  • four occupants in the house
  • a thermostat setting of 21°C (70°F) on main floors and 19°C (66°F) in the basement
  • a total domestic hot water consumption of 225 litres per day
  • lighting and appliance electricity consumption of 24 kilowatt hours per day
  • a minimum monthly average ventilation rate of 0.35 air change per hour during the heating season