We come home after work and sometimes our house is 60 degrees. We turn the Honeywell dial thermostat from "Heat" to "Off" and back to "Heat" and the Carrier 58SXA080 furnace starts fine and warms the house to 70 degrees. This was happening once a month, but now it is happening almost daily. I replaced the thermostat with the same model except for the back plate thinking the mecury switch was bad. But this did not help... Thanks. -Tom