I have a question about the operation of a White Rodgers 1 F87-361 prgrammable digital thermostat. It operates a gas furnace/a/c in a converted garage we use as a family room. Here's the issue. If I set back the temperature at night to say 64* from 69*, and ramp it back up in the morning back to 69*, the thermostat will not "catch-up" to the proper temperature, and the furnace will continue to run until the temperature well exceeds 69*. The furnace won't stop until the thermostat temperature reading finally gets to 69*. But by then, it's roasting, since the actual temperature (actual readings with a digital thermometer) show temperature far above 69*, and it feels it). This happened with a prior White Rodgers 1 F87-361 that contractor replaced because he thought it may have been faulty. Same thing with the new one. Once the room temperature and the thermostat temperature balance out, it works fine. I can also tell you years ago I had a mechanical thermostat and this was never a problem. I was able to even shut off the furnace, and ramp it up manually the next morning and it would always stop at the correct temperature. What's going on here? What I've done in the meantime is stagger the upward temperature. I set it to go to 66* and then a half hour later to 69* in order to minimize the excessive heat. Sorry for the long thread, but I just don't think the thermostat should operate that way.