New research has revealed why it's more important than ever to heat our homes.
Auckland University has compared temperature and humidity readings from rooms of New Zealand children, with their health records.
Nearly half sleep in a bedroom that's too cold -- and 13% sleep in one too warm or humid.
Kids sleeping in these environments have a greater likelihood of poorer health.
Building Research Association Industry Research Manager Chris Litten told Kate Hawkesby houses need to be built so they're warmer -- but we also need to heat them.
“It’s part of New Zealand culture, we need to get over it. We need to start heating things and looking after ourselves.”