Here are some key findings (all information courtesy of the Canadian Home Builders Association (CHBA)):
Overall, almost all NZ and NZR homes consumed fewer than 100 Gigajoules of energy per year.
Homes with a smaller footprint (less than 6,000ft2) consumed the least energy – averaging at about 60Gj/year. Meanwhile, the larges of homes required more energy to keep the home running, averaging closer to 80Gj/year.
Such a difference is unsurprising, since a larger floor area requires a higher output from heating and cooling systems, even if the home is NZ or NZR.
Energy Consumption Improvement Over Reference House
This final energy performance statistic compares NZ homes’ energy consumption (without occupant loads) to the reference house, i.e. the code minimum.
The finding of the study reveal that a large portion of NZ detached homes saw improvements of 60%-80% over the reference house, whereas attached homes saw smaller improvements of about 40%.