Heat Loss Calculator
Find out how much heat is lost from your home through the walls, roof, floors and windows, and how much you can save with different kinds of insultion.
Enter information you know off the top of your head such as the number of rooms, whether they are small, medium or large and if your windows are single or double glazed. You may need to check how thick the insulation is in your attic, and if you have solid or cavity walls. The calculator will tell you exactly how much heat is lost through each area of your home, how much this costs you, what the CO2 emissions are, and the best forms of insulation to use.
We hope you enjoy using the calculator, and find it useful. Good luck!
Example values are in place for a typical three bedroom semi-detached house.
The annual heat loss from your house is kWh
What does this mean? kWh (kilo Watt hours) are units of energy. So this is the amount of energy lost through the walls and windows of your home every year.
By applying good insulation you can cut heat loss, fuel bills and CO2 emissions by
Mukti Kumar Mitchell, North Devon, February 2009
What is the purpose behind the HEAC?
It is now widely recognised that CO2 emissions are causing climate change, which threatens nature and civilisation. The UK Government is committed to a 20% reduction of national CO2 emissions by 2020. Domestic energy use causes 25% of national emissions, and heating uses 90% of energy in the home. If we could all reduce our house heat-loss by half, that would cut national emissions by 10%. As you will see from the calculator, it is not that difficult to cut the heat loss from the average house by half, as most old houses leak a lot of energy! New houses are built to more stringent requirements and waste less energy. But most houses in Britain need to be improved. This calculator helps you see what changes can be made to your house to reduce its heat loss.
Reducing heat loss also saves money. The cost of energy is rising steadily as we turn to the smaller remaining oilfields. Conserving heat reduces the need for new energy sources such as windmills or nuclear power stations, keeping the country a nicer, safer place.
Mukti Mitchell is a sailor, carpenter, environmental designer and pioneer of low carbon lifestyles who lives by the sea in North Devon. He designed and built the revolutionary zero-emission microyacht Explorer, nominated "Innovative Boat of the Year" 2005 at the IPC Marine Awards, and set up Mitchell Yachts to manufacture these. In 2007 he sailed around Britain to promote low carbon lifestyles, supported by HRH The Prince of Wales, James Lovelock, Jonathon Porritt, Zac Goldsmith, Tim Smit, Tony Juniper, Satish Kumar, Caroline Lucas, Stephen Tindale and Jonathan Dimbleby.