Electronics › Smart Home & Security
T9 Smart Thermostat
Smart thermostat with remote temperature sensor
Mid-range · middle third of smart home & security
Quick take
In short: what each side says
AI panel · Buyers — each opened up in full further down ↓
Best on Perplexity (avg #6.0), weakest on Claude (#8.0)
Owners love the remote sensor's ability to balance room temperatures and the convenient app control, but the display's excessive brightness and limited scheduling flexibility (can't combine time…
All sides but one land high — Holds up — with one check: owners score display brightness weakest.
Main competitors
Top rivals in Smart Home & Security.
The verdict
What the panel makes of it.
The T9 earns solid buyer approval for its remote sensor that balances temperatures across rooms and straightforward app control, though the overly bright display and inability to combine scheduling rules frustrate some owners. At $150–$190, it delivers practical smart heating for households that prioritize room-by-room comfort over advanced automation.
Act one
What the machines think.
Several AI models read the category and place this product — model by model, list by list, over time.
Model by model?
How each AI sees it.
Best on Perplexity (avg #6.0), weakest on Claude (#8.0) Averaging across the AI panel, T9 Smart Thermostat sits around #7.0 this snapshot.
Grok
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Didn’t rank T9 Smart Thermostat this snapshot.
GPT
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Didn’t rank T9 Smart Thermostat this snapshot.
AI Mode
Didn’t rank T9 Smart Thermostat this snapshot.
Rank trajectory?
Weeks of movement.
Act two · ★ new
What the people say.
The same product, judged by the owners who bought and filmed it — what they praise, what they knock, who it's for.
What buyers say?
What Google knows about it.
Beyond the video critics, Google pools 3,273 buyer ratings of the T9 Smart Thermostat from across retailers — a far wider, if blunter, jury. Here’s the shape of that opinion.
3,273 ratings · 7 written
across 1 retailer
What owners single out
The display brightness issue that divides buyers directly mirrors the critic's design complaint about the screen being too bright even at minimum setting.
In their words
“This was pretty easy to install, the remote sensor works great. I had a room that was always too cold during winter or too hot during summer. After installing this, the temperature in that room was able to be maintained at what I set the thermostat too. Also love how I could use my app to control this. They could work on the documentation a little better. My old thermostat had a W O/B on the same ”
chorobe · verified purchase · resideo.com
“I live in Anchorage, AK and my house is forced air. I installed the T9 with remote sensor Jan 2025. It is currently the end of Feb 2025 and it's been working reliably every day. Reason for 3 stars is due to the programming options. Setup through the app was very easy. My issue is you have to choose to run it on a time schedule or run it in geofence mode. You cannot run both at same time. Which is ”
Montana P. · verified purchase · resideo.com
as of July 10 · 3273 buyer ratings?
Owner signals?
What owners flag months in.
Not the launch-day reviewers — the owners still posting months later, on the faults that keep recurring.
T9 not syncing to Resideo app cloud
Moderate severityOwners report the T9 fails to sync with the Resideo cloud app and gets stuck after integration attempts; the 4.0★ rating may understate this since it develops after weeks of use.
T9 becomes unresponsive after HomeKit setup
Moderate severityMultiple owners report the T9 freezes or stops responding after connecting to HomeKit, with some unable to establish the connection at all.
as of July 13 · 9 forum threads?
Frequent rivals?
What it competes against.
- ThermostatWyzeHoneywell Home leads 1–0 · 1 sharedRead
- S40 Smart ThermostatLennoxHoneywell Home leads 1–0 · 1 sharedRead
- Vivint Smart ThermostatVivintHoneywell Home leads 1–0 · 1 sharedRead
- Netatmo Smart ThermostatNetatmoHoneywell Home leads 1–0 · 1 sharedRead
- 8920W Wi-Fi ThermostatAprilaireHoneywell Home leads 1–0 · 1 sharedRead
- Wiser Smart ThermostatSchneider ElectricHoneywell Home leads 1–0 · 1 sharedRead
- XL824 Smart ControlTraneHoneywell Home leads 1–0 · 1 sharedRead
Alternatives by price · Same field?
Same field, less money.
The recap
Where it stands today.
- PositionBest rank #6 across 1 intent tracked (slipped 3 this week).
- FootprintStrongest in Best Smart Thermostats (#6).
- TraitsMost often described as “automation”.
- Closest rivalThermostat (1–0 across 1 shared intent).
- MakerBy Honeywell Home — see how it ranks across other intents on its brand profile.
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