Premier White 7 Day Programmable Chronotherm IV Plus Deluxe Thermostat Full 7-day program capability; different schedules and temperature setpoints may be selected for everyday to fit any schedule. Use with 24 Vac single-stage heating and cooling systems Powered direct from 24 Vac transformer Copy key makes programming easier and faster Daylight Savings Time (DST) key for quick change in and out of Daylight Savings Time. Easy temporary temperature setpoint changes for current period, vacation hold (1 to 255 days) or indefinite hold adds to your comfort and energy savings. Frequently used keys are located by the Liquid Crystal Display (LCD) for quick and easy access to information. Attractive styling complements any decor to the homeowner’s delight. Back lighting the large display makes the LCD very easy to read. Configurable features: F or C temperature display Automatic or manual changeover Electric or conventional heat fan operation Adjustable heating cycle rate. Minimum off time for cooling compressors and heat pumps helps protect and extend the equipment life. Adaptive Intelligent Recovery control brings the room temperature to temperature setpoint at the programmed time, maximizing comfort and energy savings. Setpoints are permanently held in memory and retained during power outages for increased installer and homeowner convenience. White color