This device is used when a heat pump and gas furnace are paired together as heating equipment for the home. The device keeps the furnace from operating at the same time as the heat pump - only one or the other can run at a time. This is importatant so that the gas furnace doesn't run when the heat pump is on, which could damage the heat pump as well as cause it to operate improperly.
In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.