Work Performed: Follow-up combustion analysis on 2016 Daikin two-stage furnace after previous maintenance. Technician was concerned about higher CO readings during testing. Using a calibrated combustion analyzer, readings were taken and results showed approximately 85 ppm CO and 110 ppm CO air-free. Checked gas pressures, temperature rise, and overall combustion characteristics — all found to be within normal range for this Daikin model. Results: In my experience, these combustion levels are acceptable for this type of Daikin furnace, as Daikin and Goodman models are known to produce slightly higher CO readings while still operating safely and efficiently. Furnace is operating normally at this time and performing well after maintenance. Additional: Estimated client for a new Sensi Wi-Fi thermostat upgrade.