How to Clean Your AC Condenser Coils

Efficiency starts outside, specifically with the metal cabinet housing your AC condenser coils. Over the course of a season, these fins act like a magnet for cottonwood, grass clippings, dust, and spiderwebs, creating a thick blanket of insulation that forces your compressor to work double-time just to maintain a comfortable temperature inside. Cleaning these coils is a rite of passage for every homeowner that directly impacts your electricity bill and the lifespan of your unit. When the air can pass freely through the fins, the heat exchange process operates as designed. A clean unit is a quiet, efficient unit that keeps your home cool without straining its internal components.

1. Kill Power First. Locate the electrical disconnect box near the unit and pull the lever to the 'off' position. This prevents the unit from kicking on while you are working and ensures your safety around water.
2. Remove Debris First. Use a soft-bristle brush or your hand to remove large leaves, sticks, or clippings from the exterior of the condenser unit. Clear at least two feet of space around the unit to ensure proper airflow.
3. Comb Fins Straight. Inspect the aluminum fins for any areas where they are bent or crushed. Use a fin comb to gently pull them back into an upright position to allow air to pass through freely.
4. Apply Cleaner Liberally. Spray a specialized foaming coil cleaner liberally over the outside of the coils. Let the foam sit for about 10 to 15 minutes so it can lift the grease and grime out of the inner depths of the fins.
5. Rinse Gently. Use a garden hose with a standard spray nozzle on a low-to-medium setting to rinse the cleaner away. Aim the water stream straight into the fins to avoid bending them and keep the pressure gentle.
6. Restore Power and Test. Once the unit is dry, return to the disconnect box and switch it back to the 'on' position. Wait a few minutes before turning the thermostat down to ensure the system cycles properly.