Thermal imaging survey
Thermal imaging survey for heat loss: what it shows and what it misses
Thermal imaging can add useful evidence on a heat loss job, but it does not replace measurements, fabric notes, or room-by-room calculations.
Related: heat loss calculations · heat loss inputs guide · view sample report
Thermal images show surface temperature patterns at the time of capture. That can be useful, but only when the conditions, location, and context are recorded properly.
What a thermal imaging survey can help with
- Highlighting colder areas, junctions, or obvious anomalies that need a closer look
- Supporting fabric notes and assumptions with extra visual evidence
- Giving installers and homeowners a clearer record of what was seen on the day
What it cannot prove on its own
- Results depend on the conditions at the time of capture, not just the camera
- A thermal image on its own does not tell you the exact construction build-up or U-value
- It is supporting evidence, not a substitute for measurements or a heat loss calculation
When it is worth adding to a heat loss survey
- Older properties where fabric assumptions are unclear
- Extensions, junctions, or loft areas where the evidence is mixed
- Jobs where the client wants clearer visual backing for the written notes
How we document thermal imaging when it is included
- Each thermal image is paired with a normal context photo
- The notes explain what is being shown, where it was captured, and why it matters
- The images sit inside the same report structure as the rest of the survey evidence