Restoring Airflow: Coil Cleaning in Action

Some of the hardest-working components in an HVAC system are also the easiest to overlook — until dirt and grime start choking their performance. In this job, our technicians tackled a heavily soiled coil section, where months of accumulated dust, debris, and moisture had built up across the fins and drain pan.

Before any cleaning could begin, the unit's access panel had to be carefully removed to reach the internal coil bank — a process that took two technicians working together, using hand tools to safely detach and reposition the panel without damaging surrounding components.

Once inside, the extent of the buildup became clear: the fin coil was coated in a fine layer of dust and grime, while the drain pan below had collected dark, sludge-like residue from prolonged use. Left untreated, this kind of buildup restricts airflow across the coil, forces the system to work harder to hit the same output, and creates a breeding ground for bacteria and odor-causing buildup.

Using a combination of manual cleaning and flushing hoses, our technician worked methodically through the coil surface and drain pan, breaking down the grime and clearing the pan of standing residue. The difference this makes is significant — clean coils transfer heat far more efficiently, meaning better cooling performance and lower energy costs for the system overall.

Jobs like this are rarely seen by building occupants, but they're exactly the kind of preventive work that keeps HVAC systems reliable and efficient over the long run.