RTH2410B1001THERMOSTAT 5-1-1 PROGRAMMABLE | Our 5-1-1-day programmable thermostat is known for being easy to use. It's designed specifically for low volt heating/cooling systems, including millivolt and heat pumps with or without auxiliary heat. It's also programmable, so you can program weekdays one way and create unique programs for Saturdays and Sundays. What's more convenient for you also helps save on energy costs.