The answer to 'how to clean air handler' is to regularly clean the air handler unit to maintain efficiency and indoor air quality. This includes cleaning the air filter, coils, blower, and housing to remove dust, dirt, and debris buildup.
Start by turning off power to the unit and removing the access panel. Vacuum or brush away any loose debris on the exterior. Next, remove and inspect the air filter - replace it if it's dirty or damaged. Use a coil cleaner and a soft brush to gently clean the evaporator and condenser coils. Wipe down the blower wheel and housing with a damp cloth. Once cleaned, replace the filter and access panel, then restore power to the unit.