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Amazon.com Providing temperature monitoring and total home comfort, the Honeywell RTH5100B Deluxe Manual Thermostat is compatible with most heating and cooling systems. This easy-to-use unit has a clear display, straightforward controls, and an attractive design that blends seamlessly with any decor. RTH5100B Deluxe Manual Thermostat At a Glance: Accurate temperature control of +/- 1° F Backlit display and soft-touch buttons Automatic changeover from heating to cooling--set it and forget it Range stops allow you to control maximum and minimum temperature settings Compatible with most heating and cooling systems 1-year warranty The large backlit display makes it easy to read the room temperature. View larger.Easy to Install and Operate The RTH5100B is an ideal thermostat for anyone who wants a basic battery-powered unit that achieves a consistent temperature range. The thermostat is incredibly easy to install, and its large backlit display and soft-touch keys make setting the time and temperature a cinch. Precise, Consistent Temperature Control The RTH5100B allows precise temperature control plus or minus one degree Fahrenheit, so you can create the atmosphere that's perfect for you. For further convenience, it features advanced temperature monitoring to minimize temperature swings, automatically shifting from heating to cooling when temperature set points are reached--a useful feature for climates with large temperature swings during the day. This model also features range stops that allow you to control the temperature range at which the thermostat can be set (40-degree to 90-degree heating range; 50-degree to 99-degree cooling range). Compatibility and Warranty Information The RTH5100B is compatible with single-stage heating/cooling systems and heat pumps without auxiliary heat. It is backed by a one-year warranty. What's in the Box Honeywell RTH5100B Deluxe Manual Thermostat; mounting hardware; warranty card; and manual. COMPATIBILITY 24-VOLT HEATING AND AIR CONDITIONING SYSTEMS:Single-Stage Heating and Cooling Multistage Heating and Cooling Heating OnlyCooling Only Furnace (Warm Air) Central Air ConditioningHeat Pump without Auxiliary HeatHeat Pump with Auxiliary Heat Hot Water Steam or Gravity 750 Millivolt Gas Fireplaces (24 Volt or 750 Millivolt) Electric Baseboard Heat (120 - 240 Volts) From the Manufacturer This attractive one-piece Honeywell digital non-programmable thermostat features advanced temperature monitoring to minimize temperature swings ensuring your complete comfort. The RTH5100B has a green backlight and easy soft touch key operation. This thermostat also keeps the temperature settings in case of a power outage. Simple peace of mind and total home comfort. Works on all central heating and cooling systems including heat pumps without auxiliary heat source.