Making a thermal heat map of the US

A start-up in the US is using a fleet of cars equipped with thermal imaging cameras to highlight the properties and homes that are not energy efficient.

Some fear the data set could encourage unsolicited sales calls to poorly performing properties, but the company says that the technology means insulation products will be better targeted in the future to homes that need them the most.

BBC Click's Dan Simmons spoke to the company's chief executive officer Tom Scaramellino to find out more.

More at BBC.com/Click and @BBCClick.