It is recommended you have at least 270mm (ten inches) of loft insulation. You could save up to £180 a year if your loft is uninsulated by installing 270mm of insulation. Even if you have some insulation, by topping up from 100mm to 270mm could save around £25 a year.
Cavity wall insulation
(CWI) If a home was built after 1930, the chances are that its external walls are made of two layers of brick with a gap or cavity between them. Cavity wall insulation can save up to £140 a year.
Draught proofing
of windows, doors and blocking cracks in floors and skirting could save £55 a year in a draughty home, these works are relatively inexpensive and can pay for themselves in about two years.
Hot Water Tank insulation
If you already have a hot water tank jacket fitted, check the thickness, it should be at least 75mm thick. Fitting a British Standard jacket will cost around £15 DIY, cut heat loss by over 75% and save you around £45 a year.
Solid wall insulation
If your home was built before 1930, its external walls are probably solid rather than cavity walls. The cost of installing internal wall insulation is much more than CWI but could save around £460 a year.
Efficient lighting
If the average household replaced all their remaining old-fashioned bulbs with low energy light bulbs and all their halogens with LEDs it would cost around £110 and save around £60 a year.
Heating controls
Whatever the age of your boiler, the right controls will let you set the times, temperature and the rooms where you want your heating. Here are some things you could do in a typical three-bedroom semi-detached home, heated by gas:
- Install a room thermostat if you didn't have one before and save around £70 a year.
- Thermostatic radiator valves (TRVs), allow only rooms to be heated independently and therefore the boiler works less hard and uses less energy.
Replace your boiler.
Boilers account for around 55% of what you spend in a year on energy bills. Replacing an old gas boiler with an A-rated high-efficiency condensing boiler and improving your heating controls will cost around £2,000 and could save you as much as £310 a year.
*savings based on standard amounts and standard heating pattern for a 3 bedroomed semi-detached property.