The Problem
Property manager had damp drywall on 3rd floor that two contractors couldn't trace. Tenants were complaining.
Detection Method
Evening thermal scan of 3rd and 4th floors. Identified a 2C differential in a fan-coil supply line above the suspended ceiling — a pinhole leak saturating drywall over weeks.
Results
Repaired same week with minimal drywall removal. Total detection cost: under $1,000. Estimated $15K in exploratory repairs avoided.