Last night, DH came to me and asked if I thought that the radiator in the bathroom was running really hot. It seemed like it was so I looked at the thermostat and it was set for 64 degrees. Looked at the thermometer on our clock and it said 76 degrees. DH went to bed and I kept track, noticing that the furnace was running way too often and the radiators were not cooling down. I turned the thermostat down to 52 degrees and finally the radiators started cooling off. When I went to bed, the thermometer read 64 degrees. Just now looked at it and it was down to 59 degrees which is a little cool so I turned the thermostat back up to 60 which may trigger the furnace running near continuously again. What is happening with the thermostat?