Here are four AC maintenance tasks that can keep the outdoor unit clean:
Removing debris/foliage: Trim back or clear the area of shrubs or flowers that can restrict airflow to the unit. Physically remove any leaves or other debris that has accumulated near the base of the unit or is clinging to the side of the unit.
Vacuum the coil fins: Your dealer will turn off the system either at the thermostat, the power cutoff near the outdoor unit, or the breaker box. Once they have ensured the system is disconnected from power, they will vacuum the coil, which wraps around most of the outside of the unit using a soft bristle brush attachment. Most AC coils are composed of refrigerant tubing and thin metal “fins” that bend easily. Your dealer will be careful not to bend the fins as this can also restrict airflow and affect performance.
Cleaning the coil fins: Your dealer will turn off the system either at the thermostat, the power cutoff near the outdoor unit, or the breaker box. Once they have ensured the system is disconnected from power, they will clean the coil fins with heavy-duty coil-cleaning chemicals and using a garden hose (NOT use a power washer – too much pressure can bend or damage the fins), they will gently rinse dirt and debris from the coil starting at the top and moving down.
Cleaning the evaporator coil: The indoor evaporator coil also requires airflow for proper operation, but because it is typically difficult to access, we recommend leaving indoor coil cleaning to a licensed Carrier indoor comfort expert.