The RTH111B Non-Programmable Thermostat offers simple and reliable temperature control. It features an easy-to-use digital display with soft-touch buttons that make adjusting your heating and cooling systems a breeze. Plus, the digital display only shows the information you need to make your home the desired temperature so its straightforward to adjust. Precise temperature control of +/- 1 degree Fahrenheit Easy-to-read digital display Simple, soft-touch buttons allow you to select the temperature quickly and easily Easy-access battery compartment and change battery reminder Set point is retained in memory in the event of a power outage Compatible with: heating, cooling and heat pumps without auxiliary heat options Does not work with electric baseboard heat (120-240 V), heat pumps with backup, or multi-stage heating/cooling Series Name: RTH111B Type: Thermostat Depth (Inches): 1.1 Height (Inches): 3.375 Width (Inches): 4.75 Auto System Change from Heat to Cool: No Backlit Display: No Cooling Only: Yes Display Type: Digital Heating Only: Yes High/Low Desired Temperature Limits: No Multi-Stage Heating and Cooling: No Shape: Rectangle Single-Stage Heating and Cooling: Yes Switching Mechanism: Electronic Temperature Displayed: Current room temperature Use with Electric Baseboard 120V-240V: No Use with Floor/Wall Furnace 24V or 750mV: Yes Use with Pellet Stove for mV Thermostats: No Use with Volt Gas Fireplace 24V or 750mV: Yes Voltage (Volts): 24 Warranty: 1-year limited Wiring Type: 2-wire Compatible with Central Air Conditioning: Yes Compatible with Heat Pump (No Aux./EM): Yes Compatible with Heat Pump (With Aux./EM): No Compatible with Hot Water: Yes Compatible with Steam or Gravity: Yes Compatible with Warm Air Furnace: Yes CA Residents: Prop 65 Warning(s): No Safety Listing: UL safety listing UNSPSC: 41112200