Your home’s actual energy costs will depend on various factors such as the size of your family, your lifestyle and your energy source (ie: electric, natural gas, propane or geothermal). The EnerGuide report is based on a number of standard assumptions, such as a family of four living in the home, specific thermostat settings and usage rates for hot water, lighting and appliances. However, the report does estimate your home’s annual energy usage based on these factors and provides a detailed breakdown of the energy consumption expected.