White Rodgers 1F97391 Thermostat comes with everything you could want in a thermostat. Digital, seven day programmable, and with a humidistat, the 1F97-391 matintains coolness and warmth. AS PART OF THE COMFORT-SET 90 SERIES BY WHITE RODGERS, THIS THERMOSTAT IS DESIGNED WITH AN AUTOMATIC SETBACK DIGITAL PROGRAM USING MICROCOMPUTER TECHNOLOGY FOR JUST THE RIGHT CONTROLS, SO YOU WILL NEVER BE UNCOMFORTABLE! For use with a normal 24 Volt system, there is no need to worry if this thermostat will work with your home, but read the manual to avoid any problems! The manual bypass operation is another feature of the 1F97-391 that allows you to change and cater your thermostat to present needs and changes in your programming. Order the 1F97-391 today!