The issue with infrared spot thermometers vs. ambient baseline logging
One of the most common habits in field investigations is pointing an IR thermometer at a wall or doorframe the moment someone feels a sudden chill. The catch is that non-contact IR guns measure the surface temperature of the solid object they strike, not ambient air temperature. If a light draft kicks up or an old HVAC cycle starts, the wall surface hasn't actually dropped four degrees in two seconds—you are often measuring surface emissivity differences across plaster, peeling wallpaper, or dark paint sheen.
Unless an investigation runs continuous multi-sensor logging (ambient air temperature, barometric pressure, and relative humidity) with a baseline established well before an active walk-through, proving a sudden localized cold spot as anomalous is difficult.
For those actively doing field investigations: how are you handling baseline data collection? Do you run stationary data-loggers, or do you still find value in spot measurements during active sweeps?