Typically, what we run across is homeowners will call in and say that their thermostat’s not at the desired temperature that they want. What we find out when we go out there is that it’s typically not the thermostat at all. It’s a mechanical failure inside the furnace. A furnace that’s running more often than it should or not running as much as it should or making loud noises—those are typical signs that you probably got something wrong with your furnace
