A thermal camera reads surface temperature and renders it as an image. That sounds simple, and it is, but it is powerful because almost every building failure changes temperature before it becomes visible. A loose electrical connection heats up. Wet drywall stays cooler than dry drywall as it evaporates. A gap in insulation shows up as a warm patch on a hot day. None of that is visible to the eye, and all of it shows on infrared.

For commercial buildings the electrical side is often the reason we get called. Loose or corroded connections in a panel, at a breaker, or on a rooftop unit’s disconnect run hot under load. Heat is the failure mechanism, so finding a connection that is running hotter than its neighbors gives you the chance to tighten or replace it on a scheduled visit rather than during an outage.

Because we hold both the plumbing and the mechanical license, we use the same camera on both sides of the building. A supply line leaking behind a wall or under a slab leaves a thermal signature, and so does a bad refrigerant charge, a plugged coil section, or duct leaking into a ceiling cavity. One inspection, both trades, no guessing about which contractor to call.

Electrical problems are the clearest. Current through a loose or corroded connection generates heat, and that heat builds as load increases. On a rooftop unit exposed to salt air near the Gulf, disconnect and contactor terminals corrode faster than the same hardware indoors, so coastal commercial buildings tend to accumulate hot spots on the roof more than anywhere else on the property.

Moisture is the second category and it is where the plumbing side comes in. Water evaporating from wet material cools it relative to its surroundings, so a leak behind drywall or under a slab shows as a cool anomaly with a shape that follows the pipe run. In slab-on-grade construction, which is the standard here, supply lines run under the concrete where nothing is visible, so a thermal scan combined with acoustic listening is how you find the leak without breaking floor at random.

The third is the building envelope and the air system. Missing or displaced insulation, air leaking around a poorly sealed penetration, duct dumping conditioned air into a ceiling, and a coil that is only cooling across part of its face all show as temperature patterns. On the coast, where afternoon sun loads a west wall hard, envelope problems show up dramatically on a summer scan.