Yes, you should clean both the inside and outside of your air conditioning coils to restore airflow and efficiency.

For a thorough cleaning start by turning off power to the unit at the breaker and confirm the system is fully de-energized. Remove any accessible panels and use a soft brush or a no-rinse coil cleaner labeled for aluminum coils to loosen surface grime on the outside coil fins, working top to bottom so runoff drains away from electrical components. For the inside coil walls, gently apply a foaming evaporator coil cleaner that clings to vertical surfaces, allow the dwell time recommended on the label, then rinse using low-pressure water from the drain pan side so you flush deposits toward the condensate outlet; avoid high pressure that can bend fins or damage delicate tubing. When the inner coil is not directly accessible, use a thin nylon coil cleaning brush or a coil cleaning spray with extension nozzle to reach between fins and into the cabinet without forcing components out of alignment. If you encounter persistent biological growth treat with an EPA accepted antimicrobial after cleaning, following safety directions and ensuring complete drying before reassembly. Reinstall panels, restore power, and run the system while checking for proper airflow and a steady condensate drain to confirm you removed restrictions.

Three common mistakes are using high pressure water which can deform fins and cause refrigerant line damage so always use low pressure and a fin comb to realign bent fins; neglecting the drain pan and condensate line which leaves moisture that feeds mold so flush the drain with a cup of white vinegar or a commercial drain cleaner and inspect the trap for blockages; and only cleaning the outside coil which leaves the inner heat exchanger fouled and reduces efficiency so make time to access and clean the evaporator as described or schedule a professional if access is restricted.

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