Heating/ Cooling


Heating and cooling together makes up for around 40% of household energy usage!


  • Heating or cooling the whole house can be expensive. Ensure to switch off the heating and cooling whenever possible i.e at night or when you’re leaving the house.
  • Setting your air-conditioner a few degrees higher or lower may not make a large difference to the temperature, but it can to your electricity bill.
  • Dress for the temperature. If you wear the right clothes at home (such as wool or simply wearing layers) you can lower the amount energy you use on heating and cooling
  • Install insulation in your roof, walls and under floor if you have the option. This will help maintain a more constant temperature in your home, reducing the need for heating or cooling.
  • Ensure that heating and cooling appliances are clean and not having to worker harder than required to hit the optimal temperature.
  • Block unused fireplaces, to help maintain the internal temperature.
  • Ensure window shading is chosen based on the size and orientation of your window to maintain consistent temperatures within the home.
  • If you are upgrading your windows, double glazing can help reduce heat transmission in glazing for windows and doors.
  • Remember to check the Energy Rating label when buying heating and cooling appliances. The higher the star rating the more you could save on energy usage. Refer to our Energy Efficient Appliances area.
  • Zone your heating and cooling for areas within the house
  • Use the Auto setting on you air conditioner instead of the On
  • Auto allows the fan to automatically turn off when the thermostat reaches the desired temperature, saving you electricity.
  • Passive design principles 


Every degree heated above 20°C can add 10% to your winter bill**

  • Every degree heated above 20 can add 10% to your bill
  • Use Door snakes and door seals to keep out the cold
  • Ensure your windows are closed and sealed
  • Close blinds/curtains at night to keep warm air in and open the day to let the sun warm the house.
  • If your system allows it, close air vents and doors in areas you are not using
  • Set heating temps to no more than 24-26 °C
  • Wear warmer clothes
  • If you have a fan, run it on low to help push warm air that has risen to the ceiling back down again.
  • The ongoing use of underfloor heating all adds up and should be used sparingly.

– If it is a comfort you can’t part with, make sure it is connected to an off-peak tariff

– Zone the system so you aren’t running everything at once


You can save up to $80 per year by setting your air-conditioner a few degrees higher. ***

  • Use Fans where possible to cool your home – they use much less energy than an air-conditioner
  • Ensure your fan is set to down and when possible set on low
  • Close blinds/curtains and doors during the day to keep warm air out
  • If you have to use the air-con, set cooling temps to no less than 24-26 °C
  • Avoid having home entertainment systems and lamps near air-conditioning thermostats. This can mean that the system will work for longer to meet the set optimum temperature as the air is warmer around appliances