The Common Maker provides a common ‘C’ connection for thermostats.
The Model 1000 provides an additional control wire to any system.
The Model 3000 provides two additional control wires to any system.
The Model 5000 provides three additional control wires and a common ‘C’ connection to a thermostat.
The Model 7000 extends the wiring between a heat pump, indoor unit, and thermostat when upgrading from an air conditioner.
The Model 9000 extends the wiring between a heat pump and indoor unit when upgrading from an air conditioner.