Source 1 CTS-Series thermostats are suitable for residential gas/electric, heat pump, or multistage systems. They feature a highresolution color touchscreen user interface that can be customized to provide simple thermostat operation or to take advantage of a full range of programmability and display options, including personalized screen savers and wallpaper. Features: 8.1 sq. in. (4.3 in. diagonal) high-resolution color display with touchscreen control; Simple, plain text menus guide through setup and programming steps; Personalized screensavers and wallpaper; Meets California Title 24 specifications; Up to 4 stages heating and 2 stages cooling; Up to 7-day installer selectable programming; Auto changeover (switchable to manual); Built-in compressor protection (defeatable for zoning applications. Adjustable timers and deadbands; Setpoint limiting; Programmable fan; Auxiliary heat indicator; Auxiliary heat lockout; Fahrenheit/Celsius display; Choice of English, Spanish, or French; Service filter reminder; UV lamp replacement reminder; Energy usage information; Remote (hardwired) outdoor temperature sensor ready. Dual fuel capable.