Q. I moved into my new house three years ago and have yet to figure out how to program what I think is an automatic thermostat. I have a master’s degree but still have no idea what to do. Can… ...

It was unclear how many homes had thermostats changed Wednesday, though TXU said tens of thousands of customers participate in the program.

The federal government recommends setting your thermostat at this number during the summer to save energy and money.