Device profile · Specifications & compatibility
Sensi Smart thermostat
Sensi · Thermostats · Model ST55
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- Sensi Smart thermostat lists Google Home; Alexa; Home Assistant.
- Check which functions the integration exposes; app compatibility does not mean every device feature is available through voice control.
Browse more from Sensi or explore all thermostats in our catalog.
- Recorded year
- 2016
- Recorded warranty
- 3 years
- Dimensions
- 150 x 95 x 25 mm
- Weight
- ?
The details that shape your choice
Sensi Smart thermostat Quick Features
Start with these specifications, then check the full details and conditions below.
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From specification to decision
Sensi Smart thermostat: Capabilities And Limitations
Based on listed specifications, not hands-on testing. Manufacturer sources are linked where checked.
What it offers
A Home Assistant integration is listed, providing an integration path to verify for the exact model. Check the exact integration and firmware. A catalog integration label does not establish local control, official support or available entities.
View Home Assistant details →A screen is listed, providing an on-device interface to investigate. Check which readings or controls are available on the device without opening an app.
View Screen details →
What to consider
Apple Home support is listed as unavailable; do not assume the device appears directly in Apple Home. Sensi lists the Sensi smart thermostat as not compatible with Apple HomeKit. Some earlier ST55 units shipped with HomeKit hardware, but a unit that shows version 33 (Menu, then Mode) is not compatible, and HomeKit cannot be added by a software or firmware update.
View Apple Home details →External temperature-sensor support is listed as unavailable; check where the controlling temperature is measured.
View External Temperature Sensors details →Matter is listed as unsupported; check another documented integration if Matter is essential to your setup.
View Matter details →
Questions About Sensi Smart thermostat
Does Sensi Smart thermostat work with Google Home?
Yes, according to the listed specifications. Check which functions the integration exposes; app compatibility does not mean every device feature is available through voice control.
View Google Home specifications →Does Sensi Smart thermostat work with Alexa?
Yes, according to the listed specifications. Check which controls are exposed to Alexa and whether an account link, hub or compatible Echo is required.
View Alexa specifications →Does Sensi Smart thermostat work with Apple Home?
No, according to the listed specifications. Check the model, firmware, exposed controls and any additional hardware requirements. Sensi lists the Sensi smart thermostat as not compatible with Apple HomeKit. Some earlier ST55 units shipped with HomeKit hardware, but a unit that shows version 33 (Menu, then Mode) is not compatible, and HomeKit cannot be added by a software or firmware update.
View Apple Home specifications →Does Sensi Smart thermostat support external temperature sensors?
No, according to the listed specifications. Check the supported sensor models and whether their readings control the heating system or only appear in the app.
View External Temperature Sensors specifications →Does Sensi Smart thermostat work with Home Assistant?
Yes, according to the listed specifications. Check the exact integration and firmware. A catalog integration label does not establish local control, official support or available entities.
View Home Assistant specifications →Explore the full picture
Sensi Smart thermostat Specifications
Recorded catalog values. Expand notes for qualifications; unknown values are not treated as missing features.
0 of 43 fields matched to manufacturer documentation. Source checks apply only to the named model and stated scope. Other fields remain catalog data. How we verify specifications →
Included Accessories2 fields
| Trim Plate | No |
|---|---|
| Temperature Sensor | No |
Integrations7 fields
| Google Home | Yes |
|---|---|
| Alexa | Yes |
| Apple Home | NoDetails & conditionsSensi lists the Sensi smart thermostat as not compatible with Apple HomeKit. Some earlier ST55 units shipped with HomeKit hardware, but a unit that shows version 33 (Menu, then Mode) is not compatible, and HomeKit cannot be added by a software or firmware update. |
| SmartThings | Yes |
| Home Assistant | Yes |
| Matter | No |
| External Temperature Sensors | No |
Connectivity6 fields
| 2.4 GHz Wi-Fi | Yes |
|---|---|
| 5 GHz Wi-Fi | No |
| Bluetooth | No |
| Z Wave | No |
| Zigbee | No |
| Thread | No |
Display6 fields
| Screen | Yes |
|---|---|
| Screen Type | LED |
| Color Screen | No |
| Touch Screen | No |
| Screen Size | 5" |
| Screen Resolution | Not recorded |
Alerts4 fields
| Temperature Alerts | No |
|---|---|
| Air Quality Alerts | No |
| Fire Alerts | No |
| Intrude Alerts | No |
Features8 fields
| External Temperature Sensors Selection | No |
|---|---|
| Energy Savings | Yes |
| System Health Monitor | No |
| Display Time | Yes |
| Display Temperature | Yes |
| Display Weather | NoDetails & conditionsThe manual lists what the wall unit shows: Wi-Fi status, time, keypad lockout, battery level, set temperature and room temperature. Local weather is a feature of the Sensi app, not of the thermostat display. |
| Voice Control | Yes |
| Speaker | No |
Scheduling3 fields
| Manually | Yes |
|---|---|
| Automatically | Yes |
| Suggestions | No |
Sensors7 fields
| Proximity Motion | No |
|---|---|
| Occupancy | No |
| Temperature | Yes |
| Humidity | Yes |
| TVOC | No |
| CO₂ | No |
| Ambient Light | No |
How this device compares
Sensi Smart thermostat vs Other Similar Models
Statistical context from 22 thermostats in this catalog. These figures describe our recorded data, not independent measurements.
Recorded feature coverage
Humidity: 18 of 22 known answers are Yes
Sensors: 82% among explicit Yes/No answers; 0 of 22 devices have no resolved answer. Check the specifications for this model’s conditions.
Recorded feature coverage
Display Time: 18 of 21 known answers are Yes
Features: 86% among explicit Yes/No answers; 1 of 22 devices have no resolved answer. Check the specifications for this model’s conditions.
Recorded feature coverage
2.4 GHz Wi-Fi: 21 of 22 known answers are Yes
Connectivity: 95% among explicit Yes/No answers; 0 of 22 devices have no resolved answer. Check the specifications for this model’s conditions.
Brand representation in this directory
4 of 22 models are from Sensi
Counts thermostats listed here, not sales or market share. Catalog inclusion does not imply a recommendation.
Side-by-side specification comparison
Compare Sensi Smart thermostat vs Similar Thermostats
See how Sensi Smart thermostat stacks up against other thermostats in this catalog. Compare specifications, compatibility and pricing.
Catalog specifications have not all been independently checked against manufacturer sources. Read our data and evidence methodology.