Honeywell Home
Honeywell Home T9 Smart Thermostat
$209.99
Released 2019
Best Smart Thermostats · head-to-head
Honeywell Home T9 Smart Thermostat vs Mysa 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.
Mysa
Mysa Smart Thermostat
—
Released 2025
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Honeywell Home T9 Smart Thermostat | Mysa Smart Thermostat |
|---|---|---|
| US price | $209.99 | — |
| Brand | Honeywell Home | Mysa |
| Released | 2019 | 2025 |
| Display | Graphical color touchscreen, 4.92 in H x 3.7 in W | LED display with touch buttons (temperature up/down, mode left/right) |
| Sensors included | Includes one wireless SmartRoom sensor (temperature + humidity); up to 20 additional SmartRoom sensors supported | Temperature (±0.5°F accuracy), humidity (±2%), light sensor, proximity sensor |
| Geofencing | Yes | Yes |
| Hvac compatibility | Up to 2H/2C conventional systems; up to 3H/2C heat pump systems; 24V low-voltage | Most 24V central HVAC: gas/oil/electric furnaces, central AC, heat pumps with AUX heat; single and multi-stage conventional and heat pump; C-wire required or adapter available |
| C wire required | No | Yes |
| Voice assistants | Amazon Alexa, Google Assistant, Apple HomeKit, Microsoft Cortana, Samsung SmartThings, IFTTT, Ring | Matter certification expected 2026 for Alexa, Google Home, Apple HomeKit; no current native integration documented |
| Energy reports | Yes | Yes |
| Release | 2019 | 2025 |
Sources — Honeywell Home T9 Smart Thermostat: honeywellhome.com (verified 2026-06-15). Mysa Smart Thermostat: getmysa.com (verified 2026-06-15).
What's the difference between the Honeywell Home T9 Smart Thermostat and Mysa Smart Thermostat?
Where the two actually differ on the specs we track (5 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 Mysa Smart Thermostat LED display with touch buttons (temperature up/down, mode left/right)
- Sensors included: Honeywell Home T9 Smart Thermostat Includes one wireless SmartRoom sensor (temperature + humidity); up to 20 additional SmartRoom sensors supported vs Mysa Smart Thermostat Temperature (±0.5°F accuracy), humidity (±2%), light sensor, proximity sensor
- Hvac compatibility: Honeywell Home T9 Smart Thermostat Up to 2H/2C conventional systems; up to 3H/2C heat pump systems; 24V low-voltage vs Mysa Smart Thermostat Most 24V central HVAC: gas/oil/electric furnaces, central AC, heat pumps with AUX heat; single and multi-stage conventional and heat pump; C-wire required or adapter available
- C wire required: Honeywell Home T9 Smart Thermostat false vs Mysa Smart Thermostat true
- Voice assistants: Honeywell Home T9 Smart Thermostat Amazon Alexa, Google Assistant, Apple HomeKit, Microsoft Cortana, Samsung SmartThings, IFTTT, Ring vs Mysa Smart Thermostat Matter certification expected 2026 for Alexa, Google Home, Apple HomeKit; no current native integration documented
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.
Mysa Smart Thermostat
No sourced tester review yet.