Large Back-Lit Display Push Button Thermostat, 5-2 Day, 2H/1C

The S1-THEC21P5S thermostat offers basic operation of HVAC equipment with the ability to run a 5+2 day program at an affordable price. Operating on either 24V system power or 2 AA batteries (included), the S1-THEC21P5S is compatible with most equipment including millivolt systems. The front loading compartment makes battery replacements a snap.The separate RC and RH terminals allows easy retrofit on older systems with dual transformers. The extra large LCD display and the built in LCD backlight aids in readability in low light conditions.