Insulation acts as a barrier to heat loss and heat gain, particularly in roofs and ceilings, walls and floors.

In many homes insulation is the most practical and cost-effective way to make a house more energy efficient, keeping it cooler in summer and warmer in winter and saving up to 80% in heating and cooling losses. In addition, insulation may reduce condensation in the home. This can provide health benefits by reducing mould and damp.

Half of the energy we use to heat or cool our homes can simply leak out without insulation.

Insulation helps to:

save money on your energy bills
reduce your energy use and lower greenhouse gas emissions
reduce reliance on heating and cooling systems
improve your comfort at home.

Some types of insulation can make your home more soundproof.

Ceiling insulation is particularly important as the highest proportion of heat transfer occurs through the roof and ceiling, but there are other areas of your home that can be insulated as well. To maximise the efficiency of your insulation, draught-proof your home to reduce heated or cooled air leaking from cracks and gaps around windows and doors, this can reduce heat loss by up to 25% from your home in winter.
Roofs and ceilings

If your roof or ceiling isn't insulated, you could lose up to 40% of your heating and cooling energy via the roof. Verandah roofs should be insulated in hot climates to reduce heat from the sun, as this not only affects the space below, but also the temperature inside the house. Covered verandahs and garages might benefit from insulation if you spend a lot of time in these areas, especially if you're heating or cooling them.

Wall insulation can save up to 25% of heating and cooling energy. Consider added wall insulation as an essential in all climates. Exceptions to this would be homes constructed from straw bale (and to a lesser extent autoclaved aerated concrete—AAC). If wall insulation is not already fitted, or if your existing insulation is insufficient, it can be retrofitted. Speak to your installer about the correct product for your particular home and location.

Appropriate floor insulation can save up to 20% of heating and cooling energy. Carpets are one option to insulate a floor. In hot climates floor insulation may interfere with the natural cooling from the ground beneath the house. Seek advice about the best option for your home and circumstance.
Water pipes

Water pipes inside walls can be insulated when building or renovating. To avoid further heat being lost from a storage hot water system, insulating externally exposed pipes leading from the water heater to the house as well as the water tank itself is recommended.

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