Robertshaw RS9220 Pro Series programmable thermostat fits 24 Vac multi-stage systems up to 2 heat / 2 cool, including central gas, electric or oil furnaces and 750 millivolt. It needs 24 Vac system power with batteries in the front-load compartment. Install takes minutes on the universal sub-base with large terminal blocks.
It runs a preset energy-saving schedule with 7-day programming. The 4.6-square-inch blue backlit display stays easy to read. Set it once and use the filter reminder and adjustable swing, calibration, and setpoint limits room by room. Heat-only setups work; 120/240V electric baseboard does not.
RS9220 highlights
2 Heat / 2 Cool control
Handles multi-stage heating and cooling for balanced temperatures.
Universal sub-base
Large terminal blocks speed wiring during replacement.
Blue backlit display
4.6-square-inch screen reads clearly in low light.
