Came out to perform preventative maintenance on AC/Heat pump. Customer met me outside home. We went over maintenance needed and discussed how system was doing for them. We were behind on the service, so I will provide both maintenances today. Customer needed a new filter, so I changed it. Inspected blower assembly, motor, coil, drains, electrical components, heating elements and overall condition of system. Returns are getting dusty, so I recommended customer have ducts cleaned soon. Customer had ducts cleaned about 10 years ago. Washed condenser coil. Checked thermostat operation, wiring, compressor, fan motor, capacitor, amps, temperatures and pressures. Cycled unit in emergency heat, heat pump, and AC. System is operating properly within manufacturing specs at this time.