"What's happening in a lot of these houses is that you'll have an elderly person, perhaps a widow on their own on a low pension, struggling to keep the house warm," explains the organisation's chairman professor John Ashton.
He goes on to note many of the most vulnerable homeowners keep just one room warm, so when they move away from it the change in temperature has a negative impact on their body.
Each year, about 30,000 people die in Britain because of cold temperatures in homes.
More tips on how to reduce bills was recently handed out by the Association of Residential Letting Agents, which said adding insulation to buildings is vital.
Posted by Jim Tidy
Click here to run an energy price comparison, and see if you could be paying less for your gas and electricity.