Coil Cleaning in San Rafael, CA

What a dirty coil costs you in San Rafael

A loaded evaporator coil does not fail loudly. It strangles airflow first. The blower works harder. The compressor runs longer. The drain pan stays wet. Wet pan plus organic dust equals biological growth. That is the musty startup odor people describe on foggy mornings. Left alone, the coil ices, water overflows the pan, and the ceiling below the attic air handler stains. Compressor replacement is the expensive end of that chain.

Local loading has clear sources. Wildfire smoke particulate from the Aug–Oct events settles fine and sticky on fins. Oak and grass pollen comes in through leaky returns every spring. Homes off long dirt driveways and unpaved shoulders pack dry-season dust. Shoreline air handlers show salt corrosion at the plenum seams. Condo units collect dryer lint and kitchen grease that no coil brush removes dry.

Access decides the job. Closet and garage air handlers in 1970s–90s tract homes usually give a removable panel. Eichler-type retrofits with the unit in a soffit chase or attic often need the coil pulled. Crawlspace-mounted systems in pre-1940 Marin homes are the worst case.

We clean the blower wheel at the same visit. A clean coil behind a caked wheel buys you nothing. Then we correct filter sizing and the return path. Otherwise the coil reloads by next season.