Honeywell Home
Honeywell Home T9 Smart Thermostat
$209.99
Released 2019
Best Smart Thermostats · head-to-head
Honeywell Home T9 Smart Thermostat vs GE Cync Smart Thermostat
A sourced, side-by-side comparison. GE Cync Smart Thermostat is cheaper at $119.99. Every spec and price links to its source.
GE Cync
GE Cync Smart Thermostat
$119.99Cheaper
Which is better: the Honeywell Home T9 Smart Thermostat or GE Cync Smart Thermostat?
On the specs we track, they're closely matched. The GE Cync Smart Thermostat is the cheaper at $119.99.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Honeywell Home T9 Smart Thermostat | GE Cync Smart Thermostat |
|---|---|---|
| US price | $209.99 | $119.99 |
| Brand | Honeywell Home | GE Cync |
| Released | 2019 | — |
| Display | Graphical color touchscreen, 4.92 in H x 3.7 in W | Backlit LCD display (always on); button and app control (Control Type: Buttons and App) |
| Sensors included | Includes one wireless SmartRoom sensor (temperature + humidity); up to 20 additional SmartRoom sensors supported | No remote sensor included (package contains 1 thermostat); Cync Room Temperature Sensors sold separately |
| Geofencing | Yes | — |
| Hvac compatibility | Up to 2H/2C conventional systems; up to 3H/2C heat pump systems; 24V low-voltage | Most residential 24V heating and cooling systems; designed for C-wire systems, Power Extender Kit (PEK) included for homes without a C-wire; 3- and 4-wire installation options |
| C wire required | No | No |
| Voice assistants | Amazon Alexa, Google Assistant, Apple HomeKit, Microsoft Cortana, Samsung SmartThings, IFTTT, Ring | Amazon Alexa, Google Assistant (Google Home) |
| Energy reports | Yes | Yes |
| Release | 2019 | — |
Sources — Honeywell Home T9 Smart Thermostat: honeywellhome.com (verified 2026-06-15). GE Cync Smart Thermostat: gelighting.com (verified 2026-07-10).
What's the difference between the Honeywell Home T9 Smart Thermostat and GE Cync Smart Thermostat?
Where the two actually differ on the specs we track (4 of 7). Matching specs are omitted.
- Display: Honeywell Home T9 Smart Thermostat Graphical color touchscreen, 4.92 in H x 3.7 in W vs GE Cync Smart Thermostat Backlit LCD display (always on); button and app control (Control Type: Buttons and App)
- Sensors included: Honeywell Home T9 Smart Thermostat Includes one wireless SmartRoom sensor (temperature + humidity); up to 20 additional SmartRoom sensors supported vs GE Cync Smart Thermostat No remote sensor included (package contains 1 thermostat); Cync Room Temperature Sensors sold separately
- Hvac compatibility: Honeywell Home T9 Smart Thermostat Up to 2H/2C conventional systems; up to 3H/2C heat pump systems; 24V low-voltage vs GE Cync Smart Thermostat Most residential 24V heating and cooling systems; designed for C-wire systems, Power Extender Kit (PEK) included for homes without a C-wire; 3- and 4-wire installation options
- Voice assistants: Honeywell Home T9 Smart Thermostat Amazon Alexa, Google Assistant, Apple HomeKit, Microsoft Cortana, Samsung SmartThings, IFTTT, Ring vs GE Cync Smart Thermostat Amazon Alexa, Google Assistant (Google Home)
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
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.
GE Cync Smart Thermostat
No sourced tester review yet.