The single most important thing you can do to save energy in your home is improve your insulation. Insulation holds the heat inside the house, reducing the need to use central heating systems or other heaters. A house loses about 40% of its heat through the loft space and walls, so good loft insulation can make an enormous difference to your heating costs. Don't be put off by the cost of installing insulation, as the savings on fuel bills will recoup that expenditure in just a few years.
If interested in insulation you can follow theses tips about ways to insulate your home.
You can see Belfast City Council's tips on home improvements including information on insulation.
You can also read the Council's guide 'You and your home' which gives information on energy efficiency, home heating and lots more.