Performed 3 system maintenance on Rheem heat pumps. We performed the outdoor checks in cooling because it was 75 degrees outside. We were only able to change 1 of the 3 filters due to the customer not having the correct sizes. We checked amps, capacitors, filters, refrigerant, electrical, drains, and safeties. The systems are performing within manufacture specifications currently, but are in need of cleanings to maintain proper operation. Recommendations 1. We recommend chemically cleaning the indoor evaporator coils to promote better heating/cooling temperature transfer. This will better the efficiency, air quality, and minimize the chance of failure. 2. Similar to the indoor evaporator coil the outdoor coils need to be chemically washed as well. The better the equipment breathes the better it operates. 3. The return cavities on the basement unit and main floor unit both have a bunch of dust and hair inside of it. This makes the filter, blower, and evaporator coil become dirty