Honeywell RTH3100C1002 Digital Heat/Cool Pump Thermostats•Easy to see read backlit display with soft-touch button interface•Quality temperature control for heat pump with auxiliary heat•Mercury free thermostat•For use with heat pumps only•Ships at 8.8-ouncesNeed more information on this product? Click here to ask.Dimensions: 2.25″ x 9″ x 7″.
From the Manufacturer
The RTH3100C1002 Digital Heat Pump thermostat provides precise temperature control with digital accuracy. This model has a green backlight and is exclusively for Multistage Heat Pump Systems (Heat Pumps with and Auxiliary heat source).