Came out to perform preventative maintenance on heat pump system. Discussed with customer about maintenance, filters, and any issues. Inspected air ranger filter, uv bulb and HEPA filter. HEPA filters will need to be changed in the attic, and we need to order more air Ranger filters for customer. I let customer know that we will order all filters needed and come back to replace them. I inspected the blower assembly, heating elements, wiring, and overall condition. Cycled emergency heat and checked amps on heating elements. Checked heat pump operation and pressures. Overall system is operating properly at this time.