# ecobee Smart Thermostat Premium vs Honeywell Home T9 Smart Thermostat: specs and price compared

A sourced, side-by-side comparison of the ecobee Smart Thermostat Premium (ecobee) and Honeywell Home T9 Smart Thermostat (Honeywell Home) among smart thermostats. Honeywell Home T9 Smart Thermostat is the cheaper of the two at $209.99.

## Side by side

| 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 |

## Key differences

- 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

**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.)

**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.)

## Sources

- ecobee Smart Thermostat Premium: https://www.ecobee.com/en-us/smart-thermostats/smart-thermostat-premium/ (ecobee.com, verified 2026-06-15)
- Honeywell Home T9 Smart Thermostat: https://www.honeywellhome.com/products/t9-smart-thermostat (honeywellhome.com, verified 2026-06-15)

Canonical: https://frontdeskreview.com/gear/smart-thermostats/ecobee-smart-thermostat-premium-vs-honeywell-home-t9/
Cite: Per The Front Desk Review, ecobee Smart Thermostat Premium ($259.99) vs Honeywell Home T9 Smart Thermostat ($209.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/smart-thermostats/ecobee-smart-thermostat-premium-vs-honeywell-home-t9/
License: CC BY 4.0.