Thermographic Inspection Season: Why Colder Temperatures Are Better for Thermal Imaging

A thermographic inspection (also called a thermal imaging survey) uses infrared cameras to identify hidden building defects such as:

• Heat loss and insulation gaps

• Thermal bridging

• Air leakage

• Moisture and damp issues

By capturing temperature variations on building surfaces, these surveys provide visual evidence of energy inefficiencies, making them a powerful tool for improving building performance and compliance.

Unlike thermal modelling, which can be carried out all year round, thermographic inspections rely on a strong temperature difference between indoors and outdoors (usually at least 10°C).

In the UK, this condition is met during the colder months. When the buildings are heated internally, outdoor temperatures remain low and thermal contrast makes defects easy to detect.

Why Cold Weather Matters

• Enhanced Accuracy: Heat loss shows more clearly when external temperatures are low.

• Reduced Solar Gain: Surveys done in early morning or evening avoid sunlight, which can mask results.

• Best Practice: Industry standards recommend surveys only when conditions meet strict guidelines on temperature, wind, and moisture.

To ensure accurate results, thermographic inspections should be carried out under the following conditions:

• Cold, dry weather (no rain or fog)

• Low wind speeds (ideally <10 mph)

• Stable indoor heating maintained for at least 24 hours before the survey

• Early morning or late evening (to avoid solar influence)

Preparing Your Building

Clients should:

• Heat the building to a steady 20–22°C

• Ensure all areas are accessible

• Schedule surveys during colder months for best results