Insulation/ CALCULATOR
Compare an indoor surface temperature with the estimated dew point.
Prepare the measurements with these instrument guides.
Track room temperature and relative humidity without mistaking one convenient location for the whole home.
How to use it
Check pipe or surface temperatures with an appropriate probe and recognize why surface temperature is not automatically water temperature.
How to use it
Check surface temperatures quickly and understand spot size, emissivity and reflective-surface errors.
How to use itFROM ESTIMATE TO ACTION
Use air temperature and relative humidity from the same room location and time after instrument equilibration. Enter 60 for 60% RH, not 0.60. Do not press a room humidity sensor against a cold surface or invent a universal settling time. Record changes in heating, windows and moisture-producing activities.
Measure the marked accessible surface point at the same time, with a suitable method and the instrument’s instructions. Reflection, emissivity and contact conditions matter; do not treat a shiny-glass infrared reading as unquestioned truth. Keep location, method and instrument information; do not open a wall or electrical panel for this calculation.
Margin = measured surface temperature − estimated dew point. Negative is below the estimated threshold; a small positive margin can change sign with plausible input changes. Test documented alternatives and retain each record. This liquid-water approximation is not a frost-point calculation, hidden-wall model, mould assessment or proof that a persistent damp area is safe.