RTH111 HEAT/COOL DIGITAL THERMOSTAT | The Honeywell RTH111B1024 digital non-programmable thermostat is designed for low volt heating and cooling systems, including millivolt and single stage heat pumps without auxiliary heat. This non-programmable thermostat offers precision comfort control via its large easy-to-read digital display. Advanced temperature controls and the ability to remember custom settings in the event of a power outage make this an extremely versatile thermostat, while the DIY installation and easily accessible battery compartment make installation a breeze.