Coil Cleaning in Kansas City, MO

What a dirty evaporator coil actually costs you

The coil loads from the entering-air side first. Airflow drops. The slab runs colder than designed. Ice forms on the fins, then melts off-cycle and overruns the drain pan. That water lands on the furnace directly below it. Rusted heat exchanger, a tripped float switch, stained drywall in a finished basement ceiling. The compressor works against high head pressure every run hour.

Access is half the job. The A-coil sits in the plenum above the furnace. On 1960s-80s installs that plenum is often fiberglass ductboard with no cut-in panel. One gets opened and resealed with mastic and foil tape. Duct tape fails there within a season.

Local loading is specific. Ragweed and tree pollen come in through return drops. Basement laundry lint gets pulled into panned joist and stud-cavity returns, then packs the first inch of fin. Drywall dust from basement finishing is worse. It sets up hard once condensate hits it.

Cleaning means a foaming product safe for aluminum, then a low-pressure rinse. Pressure washers bend fin stock permanently. The pan and condensate trap get flushed separately; biofilm there is usually the odor source, not the coil.

Check your own filter slot. Light haze on the fins is normal. A gray mat is not.