The Kirklees Warm Zone project is one of the biggest and most comprehensive programmes to tackle household energy efficiency in the UK.
As part of the programme, the Bluesky thermal image map has been published on West Yorkshire council's website.
Householders can simply type in their postcode, select their property and instantly get a colour-coded picture of how much heat is escaping through their roof and walls.
The council website also offers advice and information on ways to improve energy efficiency in the home, including how the Warm Zone programme is being delivered and other grants that may be available.
Over a three-year period every home within Kirklees will be visited in order to assess the suitability for energy efficiency improvements.
Suitable properties will be offered cavity wall and loft insulation free of charge, regardless of household income, which is a first in the UK.
Martyn Bolt, Kirklees cabinet member for the environment, said, "The thermal image is a vital tool for communicating with residents. It clearly shows the scale of the problem and we hope it will encourage residents and businesses to address the issue."