Australian houses are some of the worst in the world in their leakiness and poor insulation. Leakiness is all the holes and gaps between doors and window frames that allow cold or hot air to come into the home, requiring more energy to compensate in heating and cooling. Most of our homes have little or no insulation in their wall and roof cavities, and for the most part we don’t have double-glazed windows. All these simple building technologies would make the process of electrification and decarbonisation easier and cheaper. But insulating your home or closing the gaps economically is
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