Honeywell TH8321WF1001 Touchscreen Thermostat Wifi Vision Pro 8000 with Stages upto 3 Heat / 2 Cool 3H/2C heat pump or up to 2H / 2C conventional Remote comfort control via computer, tablet or smartphone 7-Day Multiple Day Programming or Non-Programmable Requires 'C' common wire for operation Must be installed by a licensed HVAC technician