There are two main ways to reduce unwanted energy transfers by heating:
The table shows some ways in which this is achieved in homes and other buildings.
|Cavity wall||A gap between two brick walls contains air, which has a lower thermal conductivity than brick.|
|Cavity wall insulation||The gap between two brick walls is filled with material that has a lower thermal conductivity than air.|
|Loft insulation||A thick layer of material with a low thermal conductivity reduces the rate of heat transfer through the ceiling.|
|Double glazed windows||A gap between two panes of glass contains air or another gas, which has a lower thermal conductivity than glass.|