Honeywell Home
Honeywell Home T9 Smart Thermostat
$209.99
Released 2019
Best Smart Thermostats · head-to-head
Honeywell Home T9 Smart Thermostat vs Sensi Touch 2 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.
Emerson Sensi
Sensi Touch 2 Smart Thermostat
$209.99
Released 2023
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Honeywell Home T9 Smart Thermostat | Sensi Touch 2 Smart Thermostat |
|---|---|---|
| US price | $209.99 | $209.99 |
| Brand | Honeywell Home | Emerson Sensi |
| Released | 2019 | 2023 |
| Display | Graphical color touchscreen, 4.92 in H x 3.7 in W | Color touchscreen (size not specified on product page); Sensi app control available |
| Sensors included | Includes one wireless SmartRoom sensor (temperature + humidity); up to 20 additional SmartRoom sensors supported | Built-in temperature; compatible with Sensi Room Sensors and Outdoor Sensors (sold separately) for temperature and humidity monitoring |
| Geofencing | Yes | Yes |
| Hvac compatibility | Up to 2H/2C conventional systems; up to 3H/2C heat pump systems; 24V low-voltage | Universal: single-stage 1H/1C, multi-stage 2H/2C, heat pump 4H/2C; 24V low-voltage systems |
| C wire required | No | No |
| Voice assistants | Amazon Alexa, Google Assistant, Apple HomeKit, Microsoft Cortana, Samsung SmartThings, IFTTT, Ring | Amazon Alexa, Google Assistant, Samsung SmartThings (no Apple HomeKit) |
| Energy reports | Yes | Yes |
| Release | 2019 | 2023 |
Sources — Honeywell Home T9 Smart Thermostat: honeywellhome.com (verified 2026-06-15). Sensi Touch 2 Smart Thermostat: sensi.copeland.com (verified 2026-06-15).
What's the difference between the Honeywell Home T9 Smart Thermostat and Sensi Touch 2 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 Sensi Touch 2 Smart Thermostat Color touchscreen (size not specified on product page); Sensi app control available
- Sensors included: Honeywell Home T9 Smart Thermostat Includes one wireless SmartRoom sensor (temperature + humidity); up to 20 additional SmartRoom sensors supported vs Sensi Touch 2 Smart Thermostat Built-in temperature; compatible with Sensi Room Sensors and Outdoor Sensors (sold separately) for temperature and humidity monitoring
- Hvac compatibility: Honeywell Home T9 Smart Thermostat Up to 2H/2C conventional systems; up to 3H/2C heat pump systems; 24V low-voltage vs Sensi Touch 2 Smart Thermostat Universal: single-stage 1H/1C, multi-stage 2H/2C, heat pump 4H/2C; 24V low-voltage systems
- Voice assistants: Honeywell Home T9 Smart Thermostat Amazon Alexa, Google Assistant, Apple HomeKit, Microsoft Cortana, Samsung SmartThings, IFTTT, Ring vs Sensi Touch 2 Smart Thermostat Amazon Alexa, Google Assistant, Samsung SmartThings (no Apple HomeKit)
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.
Sensi Touch 2 Smart Thermostat
Three whitelisted testers (TechHive, Pro Tool Reviews, Reviewed) rate the Sensi Touch 2 among the best simple smart thermostats, praising its responsive touchscreen, easy app-guided installation (Pro Tool Reviews clocked ~10 minutes), and support for remote room sensors that average temperatures across the home. All three note it requires a C-wire. Reviewed lab-tested it on a simulated HVAC system with a NIST-calibrated thermometer but published no accuracy figure; its main criticism is the lack of machine learning at a premium price. (3 sourced reviews, 2 lab-tested.)
Praised: Intuitive, responsive touchscreen and easy-to-use app/interface; Fast, DIY-friendly installation guided by the app; Supports remote room sensors for whole-home temperature averaging.
Flagged: C-wire required; Remote room sensors not included (~$40 each); No Apple HomeKit support.