Air flows, draught sealing and double glazing: how homeowners can retrofit houses for warmth

Jenny Edwards and her team of scientists assess people’s houses with thermal imaging and other high-tech tools to find tiny holes letting in the cold outside air. Photograph: Tracey Nearmy/The Guardian

Methods of keeping living spaces warm range from cheap gap-sealing to expensive double-glazing, but the first step is to find and see the problem

It’s minus four degrees when scientist Jenny Edwards arrives to inspect my bitterly cold Canberra home. Huddled inside with a coffee, dressed for an ascent to Everest base camp, I’m fretting over whether she’ll make it past the front deck. It’s iced over again.

I’m breathing fog in the kitchen and frost has covered the bay window in my bedroom.