Coil Cleaning in San Jose, CA

What a loaded coil costs before you notice it

A dirty evaporator coil does not announce itself. Airflow drops first. Then suction pressure drops. Then the coil face frosts, melts, and overfills the drain pan. That water goes somewhere. Usually a ceiling, sometimes a crawlspace. Wet pans and damp insulation are where mold shows up here (attic duct interiors stay dry in this valley, but pan and coil areas do not). Liquid refrigerant returning to a starved compressor is the expensive ending.

Coils foul fast in San Jose for specific reasons. Most older homes have a 1-inch filter slot that was never sized right, so air bypasses at the edges and loads the fins directly. Panned joist returns in postwar homes pull unfiltered attic air. Add spring pollen, drywall and construction silt from constant remodel work, and wildfire soot in late summer.

The work itself is physical. Many A-coils have no factory access panel, so sheet metal gets cut and a new panel fabricated and sealed. Cleaner is applied, rinsed, fins combed straight, pan flushed, drain line cleared and trapped properly. Microchannel condenser coils need gentle pressure and a neutral cleaner.

Pull your filter and look at the upstream coil face with a flashlight. Gray felt means overdue. A coil weeping oil means stop. That is a leak, not dirt.