Some communicating thermostats are also smart thermostats, but the terms do not refer to the same capability. Do Nest, Ecobee and Lyric thermostats work with communicating systems? Yes, but only if the system is wired to function as a non-communicating system. There are no third-party thermostats that work with communicating HVAC systems.
Other models like the Ecobee Smart Thermostat and the Honeywell Prestige series (including the newly announced Honeywell Wi-Fi Smart Thermostat) offer similar features like internet connectivity via Wi-Fi, mobile apps for remote management, and "learning" features that let it auto-program itself based on your habits.
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