The Bryant Evolution Connex thermostat is fully loaded! It has virtually all of the features of the Preferred thermostat but adds to them while maintaining ease of programming. Capable of controlling up to eight zones with programming for each; allows you to manually adjust the fan speed for quieter “fan on” operation; you can program the fan to run at certain times at a certain speed; outdoor temperature will display with a sensor installed; has an “unoccupied” mode for energy savings when you are not home; error notification when something goes wrong with your heating or cooling equipment; the feature list is long! This is one of the finest thermostats on the market today.