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Deal-Breaker Comparison
| Attribute | Honeywell Home T6 Pro Z-Wave Thermostat | ecobee Smart Thermostat Premium |
|---|---|---|
| Local Control | +Local Control | −Cloud Only |
| Open API | +Open API | +Open API |
| Cloud Dependency | No Cloud Needed | Cloud Optional |
Overview
Honeywell Home T6 Pro Z-Wave Thermostat
The T6 Pro Z-Wave is the thermostat the local-control community keeps recommending when someone asks what actually works for years without drama. It has no Wi-Fi, no app, no account, and no cloud — just certified Z-Wave and physical buttons — built on Honeywell's decades of unglamorous HVAC control hardware. Note the model numbers: the long-recommended TH6320ZW2003 is discontinued; the current TH6320ZW2007 is the same thermostat with a newer Z-Wave chip, and everything here applies to both.
ecobee Smart Thermostat Premium
The ecobee Smart Thermostat Premium is the flagship of one of the two thermostat makers that have actually stayed the course in smart climate control. The Premium model wraps a responsive touchscreen in a zinc-and-glass housing, adds a built-in air quality sensor for VOCs and estimated CO2, includes a remote SmartSensor for occupancy and temperature in a second room, and doubles as a small smart speaker with Siri or Alexa onboard. It is a thermostat first, though, and the core job, running your HVAC reliably on a schedule, works whether or not the internet does.