To keep your home energy efficient, you want to trap the warm air inside during the winter months. One of the cheapest ways to do this is to block any gaps around doors and windows. If less heat escapes, you can spend less money on your energy bills whilst keeping a warm home. The Energy Saving Trust estimates that draft proofing your doors and windows could save you £60 a year, so it's well worth doing. Anything that can help you save money on your heating bills whilst times are tough is a bonus, especially if it's relatively cheap to implement.