Emerson Sensi 1F87U-42WF Smart Programmable Wi-Fi Thermostat, 4H/2C

The Sensi™ Thermostat from White-Rodgers connects wirelessly to the home's Wi-Fi router with no accessories or gateway needed. The Intuitive SensiApp makes thermostat programming and operation simple for the homeowner. For most applications, no "C" wire is required. Servicing contractor contact information resides in the SensiApp. One smartphone or tablet can control multiple thermostats.