Performed semiannual maintenance on three AC systems: two heat pumps and one straight cool unit. Inspected all Performance, Mechanical and Safety systems. I did install an Ecobee thermostat for homeowner to allow him to use the thermostat wirelessly. We also adjusted the downstairs Ecobee we installed to ensure proper dehumidification on the system. The Aprilaire 310 filter is clean. No other major issues found, and everything is working at this time.