The CT80 is a dynamic large display touch screen thermostat with 7-day programming capability. The CT80 works with nearly every HVAC system - including traditional furnaces and heat pumps. Can control 3 stages of heat and 2 stages of cool. This allows for more precise temperature regulation and less fluctuation with today's most sophisticated HVAC systems. True Auto mode to switch automatically between heat and cool depending on environmental factors. The CT80 can control an external air baffle. Can also control an external humidifier AND de-humidifier. You can program up to 7 independent periods per day. Can monitor and control your HVAC system based on humidity as well as temperature. The CT80 is backed by our 365-day a year call center if you have any trouble with your installation. You must have either power from the furnace ("C" or "Common" wire) or an external transformer to power the thermostat in order to run the Wi-Fi module. Connect to Wi-Fi - Use the iOS app or, use your computer