If your home has solid walls, you could save between £145 and £455 a year by installing solid wall insulation.

About a third of UK homes have solid walls, according to the National Insulation Association. It estimates that 45% of the heat from these homes could be escaping through walls.

A quick and free way to save money on energy is to switch to a cheaper tariff. Use the independent switching service Which? Switch to find you the best deal.

Solid wall insulation will help you reduce your heating bills and your CO2 emissions, and before long the insulation will pay for itself.