For this job, I worked on a evaluation on this gas furnace system. System was tested and everything was working in great condition, however the thermostat was not changing temperature. I tested the house temperature next to the thermostat with my syvrometer and showed the customer that her thermostat was showing a wrong temperature. I offered the customer to replace the thermostat however she mentioned her son will do it for her. Thank you for Choosing Comfort Experts, Have a great day!