Eval- customer called in because he smelled smoke, when I arrived he told me about it and noticed that the thermostat was reading 77 when it was set for 75 Upon thorough evaluation, there were no signs of burnt wires, checked out thermostat and upon satisfying temperature, system wouldn’t cut off Replaced thermostat, system would shut off and on Customer had personal UV bulb and replaced for him System is operational Thank you for choosing Comfort Experts, have a great day