A Honeywell programmable thermostat can save you significant money off your energy bill. You set it up to adjust the temperature when you are away or asleep---times when you don't necessarily need to heat or cool your home to optimum comfort---and your heating and cooling equipment runs less. This one-piece thermostat has one easy program for all days of the week (4 periods - wake, leave, return, sleep). Simple and effective use and performance. Sleek one piece design. All control buttons on face of the product with a display that shows current and set temperatures.Precise temperature control of /-1 F. Basic One Programmable with 4 programmable periods per day. Vertical positioning for easy upgrade from standard manual thermostats. One touch hold. Honeywell 1 Week Basic Programmable Thermostat. Works with low volt heating/cooling systems including millivolt & heat pumps without auxiliary heat; Easy to install.