Fast-Stat Common Maker Thermostat Wire Extender (adds A Common ‘C’ Connection)

The Common Maker adds a common C connection to a thermostat cable with 2 or more wires. A common connection allows the thermostat to operate without batteries or power stealing circuits. Compatible with all major name brand Wi-Fi thermostats and HVAC equipment, including furnaces, air handlers, zone valves, zone controllers, millivolt systems, and more.Operates over the existing 2-wire thermostat cableProduct is only to be installed by a qualified heating and cooling technicianAdds a common C connection to any popular Wi-Fi thermostatSome installations may require a 24-Volt transformer to be installed