The images show where heat is escaping from
A pilot project in Derbyshire to help people see how much heat their homes are losing could be rolled out across the country.
Teams have been driving through the streets of Bolsover with thermal imaging equipment to detect which houses are losing the most heat.
Residents are then presented with information about whether they could benefit from insulation.
Stuart Wilson from Heatseekers said residents could save up to £300 a year.
"The teams have been out on the road in Bolsover, measuring the temperature of the exteriors of the buildings and with that information, identifying which properties would benefit from either cavity wall insulation or loft insulation," said Mr Wilson.
"The vehicles drive along, up to 20mph but don't stop or take photographs or intrude on anyone.
"We're now looking to roll this out across the country."
The thermal imaging vans are part of a government-led initiative to help people insulate their homes and are funded by utility companies. Bolsover District Council has led the pilot project in Derbyshire.