Our 7-Day Programmable Thermostat RTH7500D is simple to use and has the features you appreciate most, including a large backlit display that's easy to read, even in dimly lit rooms and hallways. Smart Response Technology automatically adjusts the heating/cooling of your home, so you're comfortable at your programmed times. Other features help this thermostat provide comfort, control and convenience. It's also compatible with virtually all system types. If you're installing the thermostat yourself, the install should go smoothly.