On hot days, up to 87% of heat gain in our homes is through windows. On cold days, it's 40% of heat loss. Here's how we can fix that
On hot days, most of the heat that gets into our homes is through the windows. On cold days, windows account for almost half the heat loss. High-performance insulating windows have been installed in Australian homes at a fraction of the rates for New Zealand, the United States and the United Kingdom.