Carrier Dual fuel system. On arrival today temperature is cold enough that only the furnace is operating. And on arrival today furnace is maintaining temperature. Outdoor temperature sensor determines whether the unit operates with heat pump or outdoor unit. However, technician did observe the furnace fail to stay lit. Cleaned flame sensor and vacuumed out condensation lines. Furnace is now lighting and staying lit. I am somewhat interested in checking the refrigerant side of the system/heat pump. Office will schedule a return visit on warmer day, so that refrigerant level can be inspected and performance of heat pump. As for potentially relocating the thermostat, I have uploaded photos and I am going to talk to service to manager. As to whether relocating thermostat, or possibly, adding some manual, dampers could help balance temperature between the dining/sunroom and living room..