ecobee
ecobee Smart Thermostat Premium
$259.99
Released 2022
Best Smart Thermostats · head-to-head
ecobee Smart Thermostat Premium vs Honeywell Home T9 Smart Thermostat
A sourced, side-by-side comparison. Honeywell Home T9 Smart Thermostat is cheaper at $209.99. Every spec and price links to its source.
Honeywell Home
Honeywell Home T9 Smart Thermostat
$209.99Cheaper
Released 2019
Which is better: the ecobee Smart Thermostat Premium or Honeywell Home T9 Smart Thermostat?
On the specs we track, they're closely matched. The Honeywell Home T9 Smart Thermostat is the cheaper at $209.99.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | ecobee Smart Thermostat Premium | Honeywell Home T9 Smart Thermostat |
|---|---|---|
| US price | $259.99 | $209.99 |
| Brand | ecobee | Honeywell Home |
| Released | 2022 | 2019 |
| Display | 4-inch full-color LCD touchscreen, 540x540 pixels | Graphical color touchscreen, 4.92 in H x 3.7 in W |
| Sensors included | Built-in temperature, humidity, occupancy (radar), proximity; includes one SmartSensor (temperature + occupancy) in box; up to 20 additional sensors supported | Includes one wireless SmartRoom sensor (temperature + humidity); up to 20 additional SmartRoom sensors supported |
| Geofencing | Yes | Yes |
| Hvac compatibility | Most 24VAC systems: conventional 2H/2C, heat pumps 2H/2C + 2 stage AUX, boilers, PTACs, fan coil units (up to 3 fan speeds); Power Extender Kit included | Up to 2H/2C conventional systems; up to 3H/2C heat pump systems; 24V low-voltage |
| C wire required | No | No |
| Voice assistants | Amazon Alexa (built-in), Apple Siri (via HomePod/HomePod mini), Google Assistant, Samsung SmartThings, IFTTT | Amazon Alexa, Google Assistant, Apple HomeKit, Microsoft Cortana, Samsung SmartThings, IFTTT, Ring |
| Energy reports | Yes | Yes |
| Release | 2022 | 2019 |
Sources — ecobee Smart Thermostat Premium: ecobee.com (verified 2026-06-15). Honeywell Home T9 Smart Thermostat: honeywellhome.com (verified 2026-06-15).
What's the difference between the ecobee Smart Thermostat Premium and Honeywell Home T9 Smart Thermostat?
Where the two actually differ on the specs we track (4 of 7). Matching specs are omitted.
- Display: ecobee Smart Thermostat Premium 4-inch full-color LCD touchscreen, 540x540 pixels vs Honeywell Home T9 Smart Thermostat Graphical color touchscreen, 4.92 in H x 3.7 in W
- Sensors included: ecobee Smart Thermostat Premium Built-in temperature, humidity, occupancy (radar), proximity; includes one SmartSensor (temperature + occupancy) in box; up to 20 additional sensors supported vs Honeywell Home T9 Smart Thermostat Includes one wireless SmartRoom sensor (temperature + humidity); up to 20 additional SmartRoom sensors supported
- Hvac compatibility: ecobee Smart Thermostat Premium Most 24VAC systems: conventional 2H/2C, heat pumps 2H/2C + 2 stage AUX, boilers, PTACs, fan coil units (up to 3 fan speeds); Power Extender Kit included vs Honeywell Home T9 Smart Thermostat Up to 2H/2C conventional systems; up to 3H/2C heat pump systems; 24V low-voltage
- Voice assistants: ecobee Smart Thermostat Premium Amazon Alexa (built-in), Apple Siri (via HomePod/HomePod mini), Google Assistant, Samsung SmartThings, IFTTT vs Honeywell Home T9 Smart Thermostat Amazon Alexa, Google Assistant, Apple HomeKit, Microsoft Cortana, Samsung SmartThings, IFTTT, Ring
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
ecobee Smart Thermostat Premium
Three whitelisted testers (Tom's Guide, TechHive, Reviewed) rate the Ecobee Smart Thermostat Premium a top-tier smart thermostat. Reviewed lab-tested temperature accuracy against a NIST-certified thermometer; Tom's Guide and TechHive evaluated it hands-on qualitatively. All praise the premium redesign, easy app-guided install, broad smart-home compatibility, and the included occupancy-sensing SmartSensor. Shared gripes: a weak built-in speaker, a limited air-quality sensor, and a high price. (3 sourced reviews, 1 lab-tested.)
Praised: Premium redesign — zinc body, glass display, responsive larger touchscreen; Broad smart-home compatibility (Alexa, Siri/HomeKit, Google, SmartThings, IFTTT); App-guided installation is quick and easy.
Flagged: Built-in speaker sounds weak/tinny; Air-quality sensor is limited — no particulate readings, cannot trigger HVAC fan; Expensive / premium price.
Honeywell Home T9 Smart Thermostat
Two whitelisted testers (TechHive, Tom's Guide) reviewed the T9 hands-on in 2019 and rate it a strong, sensor-focused smart thermostat, though neither ran lab benchmarks. Both praise best-in-class remote sensors and easy setup; both flag the missing onboard motion sensor and a less-intuitive app. All six quoted lines verified verbatim against the source text. (2 sourced reviews.)
Praised: Best-in-class remote sensors with long range and quick responsiveness; Easy setup and a bright, responsive touchscreen.
Flagged: The thermostat unit itself has no built-in motion sensor; No auto-away/occupancy triggering and no built-in Alexa speaker or behavior learning; Companion app is less intuitive than Ecobee's and has minor glitches.