Performed water heater tune up. Flushed water heater. Performed cooling tune up. Flushed drain line. Cleaned condenser coil. Checked all major components and system operation. Air filter 100% impacted and in need of changing ASAP. Found blower wheel slightly impacted, evaporator coil clean. Recommend Teflon treatments for both blower and coil. No flood protection besides pan float, recommend wet switch flood protection unit to prevent costly water damage. No power surge protection inside or out, recommend power surge protection units for indoor and outdoor unit to protect motors, compressor and board from power surge damage. Found Schrader valve weeping, tightened it and it is no longer leaking. Found system refrigerant charge low, charged with 1lb of R410a. Recommend Air Scrubber to clean and sanitize the air and surfaces in home.