The fan center’s purpose is to control when the indoor fan turns on. Before the integrated gas control board, the indoor fan on gas and oil furnaces would either turn on at the same times as the heat ...

Also there is a heat anticipator built into the thermostat. It is essentially set on the current draw from the gas valve and the extra current used by the additional coil on your relay could screw ...

Bob is a service technician who is well trained and nationally certified. However, he has sometimes suffered from the same confusion that all technicians occasionally do — the facts that he gathers ...