B8.5 Active heating of houses

Survey Data

 Percentage of houses, or temperature, or number of windowsTotal houses surveyedChange since 2006
Minimum winter temperature regularly less than 0°C22%77132%
Minimum winter temperature 0°C –10ºC51%7713-3%
Minimum winter temperature greater than 10°C27%77131%
House performance in cold conditions
Houses where outdoor temperature was less than 15ºC at time of survey (ambient shaded air temperature)5%77131%
Houses that provided no improvement on the outside air temperature in cold conditions15%413-8% (improvement)
Average improvement in all houses surveyed, when outdoor temperature was less than 15ºC at time of survey6ºC413+3ºC
Houses that provided 0°C–5ºC improvement49%413-9%
Houses that provided 0°C–10ºC improvement or better72%413-5%
Outside the house
Wind break planting in the yard27%77145%
Verandah on three sides of the house10%77130
Verandah on four sides of the house9%77131%
Roof insulated37%77123%
No roof insulation or unknown63%7712-3%
Walls insulated26%57984%
No wall insulation or unknown74%5798-4%
Total windows―all houses1006947713
Windows—average number per house13.17713
Windows not functioning OK270137713
Windows—average number not OK per house37713
Houses with all windows OK33%771315%
Heating systems
Some heating system44%7712-4%
Combustion heater (wood or solid fuel)27%7712-3%
Plug-in electric heaters5%77120
Gas heating not ducted3%7712-2%
Open fire3%7712-1%
Reverse cycle heating not ducted4%77121%
Ducted reverse cycle heating1%77120
Ducted gas heating0%77120