My idea was to add a relay between the humidifier control box and the solenoid that opens the water valve. I figured if I hooked the relay up to the furnace's blower control, then the humidifier could ...

The way we control the speed of fan motors or pump motors has tremendously changed in the past two decades with the introduction of variable-frequency drives (VFDs), aka variable-frequency controllers ...

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 ...