Thermal imaging

Thermal images can show where your home is losing most of the heat produced by central heating. The image below shows typical heat loss percentages for an un-insulated detached house.


Radiator foil

IR_2733 IR_3470 (1)

These images show a solid wall (single brick) construction house before (left) and after (right) using radiator foils- note the red patches below the upstairs windows, which have significantly improved in the second image.


Since glass is reflective, the images cannot give absolute information about heat loss through windows, but can indicate loss around the glass due to poor seal performance etc. As fitting or replacing double glazing can be very costly, it is well worth using a thermal imaging survey to determine whether thicker curtains and use of foam sealants/replacement of window seals might be a cheaper yet effective alternative.


The brighter colours in this picture indicate seal leakage around window, as well as heat loss due to a thermal bridge at the join between two parts of the building. Some areas of apparent heat loss are due to different materials and can not be improved.


Image showing contrast between new (top) and older (bottom right) double glazed windows.

Wall insulation

cavity wall non-insulated cavity wall insulated

These images show neighbouring semidetached houses with (right) and without (left) cavity wall insulation. Although this is one of the more expensive options for improving the energy efficiency of a house, if you have unfilled cavity walls Green TEA may be able to advise on possible financial help for getting insulation.

Solid walls present a more complex problem in terms of general insulation, but again cheaper measures (such as radiator foils for radiators on outside walls) may help.


Although it is not generally possible to get a direct image of a roof from ground level, the success of insulation in attic spaces can sometimes be observed from particular angles. Green TEA can provide information on the current recommended levels of insulation, and we also have a library of insulation samples. Some installation could be done on a DIY basis, but grants are still available for vulnerable people.


The area in the loft can be seen as a cooler area (indicated by the arrow): this is a well insulated loft.

Roof non insulated

This image shows heat loss above a flat roof extension. The flue exhaust heating is normal.


Doors can often be an area for heat loss and draughts, depending on the material which they are constructed from, and how well fitting they are. If replacement is not an option, use of draught excluders, fitting of insulation on the inside or even use of a curtain during winter months can improve thermal comfort, particularly where the door opens directly into a living area.

door comparison