Work Performed: Replaced client-supplied carbon filter. Supplied and installed a new Lennox UV bulb and Lennox photocatalytic cartridge to restore optimal air purification performance. Also replaced the existing thermostat and set up a new Honeywell thermostat, confirming proper system operation and calibration. Results: All components are installed and functioning correctly. Verified thermostat settings and system response. Furnace and air purification system are operating normally. Client considering joining comfort club.