Updated September 2026
Data from Amazon and official Google and Sensi sites.
2026 verdict
The guest room that stays chilly overnight is a comfort job the Sensi Emerson Room Sensor can take on, humidity included.
It feeds a Sensi Touch 2 over Bluetooth, as that room's reference or averaged with the thermostat, and it carries a 3 year warranty against 1 year. The Nest Temperature Sensor (2nd gen) is the more affordable and the better reviewed, and it is the one documented for Google Home, but it reads temperature only and only for a Nest thermostat. Alexa, Apple Home, SmartThings and Matter are not supported on the Sensi sensor. Google Home and Home Assistant are not documented for it. Choose the Sensi Emerson Room Sensor with a Sensi Touch 2. Choose the Nest Temperature Sensor (2nd gen) with a Nest thermostat.
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| Feature | Nest Temperature Sensor (2nd gen) | Sensi Emerson Room Sensor | Winner |
|---|---|---|---|
| Price | $39.98 | $45.88 | Nest Temperature Sensor (2nd gen) |
| Rating | 4.4 | 4.3 | Nest Temperature Sensor (2nd gen) |
| Warranty | 1 year | 3 years | Sensi Emerson Room Sensor |
| Sensors | Temperature | Temperature, Humidity | Sensi Emerson Room Sensor |
| Connectivity | Bluetooth | Bluetooth | Tie |
| Screen | NO | NO | Tie |
| Integrations | Google Home | None | Tie |
What the differences mean
Humidity in the room average
The Sensi Emerson Room Sensor measures temperature and humidity and can be the room's primary reference or blended with the Sensi Touch 2. The Nest Temperature Sensor (2nd gen) measures temperature only. If the guest room feels clammy as well as cold, only the Sensi sensor can see the humidity.
Which thermostat it serves
These are not interchangeable accessories. The Nest Temperature Sensor (2nd gen) pairs only with a Nest thermostat and is listed for Google Home. The Sensi Emerson Room Sensor pairs only with a Sensi Touch 2 over Bluetooth. Neither has a display, and neither joins Zigbee, Wi-Fi or Matter.
Warranty, and what is not documented
The Sensi Emerson Room Sensor carries a 3 year warranty and the Nest Temperature Sensor (2nd gen) a 1 year warranty. The Nest sensor's battery is rated for 3 years on a CR2. The Sensi sensor's battery life is not documented. Alerts, automations and history are not documented for the Sensi sensor either. The Nest sensor has no alerts, automations or history of its own.
Platforms that are actually listed
Google Home is listed for the Nest Temperature Sensor (2nd gen) and is not documented for the Sensi Emerson Room Sensor. Alexa, Apple Home, SmartThings and Matter are not supported on the Sensi sensor. Home Assistant is not documented for it, and it is not supported on the Nest sensor. Do not treat the unknown rows as a loss for either side.
Which one to buy if
- the thermostat on the wall is a Sensi Touch 2
The Sensi Emerson Room Sensor is built for that thermostat and adds humidity the Nest sensor cannot read.
- the thermostat on the wall is a Nest
The Nest Temperature Sensor (2nd gen) is the accessory that thermostat accepts, with Google Home scheduling for one room.
- you want the longer warranty on a room sensor
The Sensi Emerson Room Sensor is covered for 3 years, against 1 year for the Nest Temperature Sensor (2nd gen).
- the guest room problem is temperature alone
The Nest Temperature Sensor (2nd gen) is the more affordable and the better reviewed way to give a Nest thermostat that room, and humidity is not part of the job.
- + Price: $39.98
- + Rating: 4.4
- - Warranty: 1 year vs 3 years
- - Sensors: Temperature vs Temperature, Humidity
Winner
- + Warranty: 3 years
- + Sensors: Temperature, Humidity
- - Price: $45.88 vs $39.98
- - Rating: 4.3 vs 4.4
What owners say
Owners of both are trying to stop one room from running away from the rest of the house, and both praise an easy install. Nest Temperature Sensor (2nd gen) owners talk about scheduling the bedroom at night and a living area by day, and about lower heating and cooling once empty rooms drop out of the schedule. A few mention a pairing hang, and UK buyers report units that would not join a regional Nest thermostat. Sensi Emerson Room Sensor owners, including one running a small business, single out evening out opposite ends of a building, and they note that it reads humidity as well as temperature. A minority report a pairing loop or a unit that died early, and one warns not to sync it straight out of a hot box.
Price history compared
Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.
- Nest Temperature Sensor (2nd gen)
- Sensi Emerson Room Sensor
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Frequently Asked Questions
Which is better overall: Nest Temperature Sensor (2nd gen) or Sensi Emerson Room Sensor?
The Sensi Emerson Room Sensor, on warranty and on sensing, because it reads humidity as well as temperature and is covered for 3 years. The Nest Temperature Sensor (2nd gen) is the more affordable and the better reviewed, and it is the one to buy when the thermostat is a Nest and temperature is the only reading you need.
Does the Sensi Emerson Room Sensor work with a Nest thermostat?
No. The Sensi Emerson Room Sensor connects over Bluetooth only to a Sensi Touch 2. The Nest Temperature Sensor (2nd gen) connects only to a Nest thermostat. They solve the same kind of hot-or-cold room, but they do not cross brands.
What is the biggest difference between the Nest Temperature Sensor (2nd gen) and the Sensi Emerson Room Sensor?
Humidity, and which thermostat they serve. The Sensi Emerson Room Sensor measures humidity and talks to a Sensi Touch 2. The Nest Temperature Sensor (2nd gen) measures temperature only and talks to a Nest thermostat, where Google Home is listed. Neither has a display.
Does either sensor work with Alexa or Apple Home on its own?
Alexa, Apple Home, SmartThings and Matter are not supported on the Sensi Emerson Room Sensor. The Nest Temperature Sensor (2nd gen) is listed for Google Home only, not for Alexa, Apple Home, SmartThings, Home Assistant or Matter. Google Home and Home Assistant are not documented for the Sensi sensor.
Who should buy the Sensi Emerson Room Sensor?
A Sensi Touch 2 owner who wants one room, or an average of several rooms, to include humidity as well as temperature. Let it acclimate indoors before the first sync. It has no screen, and its battery life is not documented.
Who should buy the Nest Temperature Sensor (2nd gen)?
A Nest thermostat owner who wants one room's temperature to drive Google Home schedules. It is rated for 3 years on a CR2 cell. It will not measure humidity, and buyers outside the US should confirm thermostat compatibility first.
Full comparison table
Compare all 34 Temperature & Humidity Sensors side by side
You are looking at two of them. The full table lines up all Temperature & Humidity Sensors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
- 34 Temperature & Humidity Sensors
- 43 specs compared
- 39 filters
YoLinkSmart Wireless Thermometer Hygrometer
10% OFF$16.14$14.48
GoogleNest Temperature Sensor
$39.00
EcobeeSmartSensor
$98.20
SwitchBotMeter Pro
$19.99
SwitchBotMeter Plus
15% OFF$17.99$15.29
GoveeHygrometer Thermometer H5104
$13.99
AeotecMultipurpose Sensor
$38.99
X-SenseSmart WiFi Indoor Thermometer
23% OFF$14.99$11.59
X-SenseSTH0B Smart Thermometer Hygrometer
23% OFF$14.99$11.59- Google
Nest Temperature Sensor (2nd gen)
$39.98 
SonoffSNZB-02DR2 AirGuard TH
$14.90
SonoffSNZB-02WD
$19.90
SonoffSNZB-02M AirGuard TH Pressure Sensor
$19.90
ShellyBLU H&T ZB
$22.99
ShellyBLU H&T Display ZB
$25.99
SensiEmerson Room Sensor
$45.88
SwitchBotMeter
$13.99
SwitchBotIndoor/Outdoor Thermo-Hygrometer
15% OFF$14.99$12.74
AqaraTemperature and Humidity Sensor
$19.98
SonoffLCD Smart Temperature Humidity Sensor
$15.90
CamerasGoogleNest Cam (outdoor or indoor, battery)
4.1(6,075)10% OFF$199.99$179.99
CamerasGoogleNest Cam Floodlight
4.3(1,901)8% OFF$279.99$257.99
CamerasGoogleNest Cam Indoor (Wired, 3rd Gen)
4.5(1,085)$124.54
CamerasGoogleNest Cam Outdoor (Wired, 2nd Gen)
4.4(787)25% OFF$199.99$149.99
CamerasGoogleNest Cam (indoor, wired)
4.4(5,413)$99.99
DisplaysGoogleNest Hub (2nd Gen)
4.2(1,148)$299.99
DisplaysGoogleNest Hub Max
4.2(223)$547.88
DoorbellsGoogleNest Doorbell (battery)
4.2(5,086)10% OFF$199.99$179.99
DoorbellsGoogleNest Doorbell (wired, 3rd Gen)
4.4(1,077)$193.59
DoorbellsGoogleNest Doorbell (wired, 2nd Gen)
4.4(1,130)$129.99
Door LocksGoogleNest x Yale Lock
4.2(2,025)$229.99
RoutersGoogleNest WiFi Pro
4.0(2,494)$199.99
Smoke & CO DetectorsGoogleNest Protect (Battery)
4.4(7,508)$406.99
Smoke & CO DetectorsGoogleNest Protect (Wired)
4.6(4,629)$449.99
SpeakersGoogleNest Audio
4.4(219)$119.99
SpeakersGoogleNest Mini (2nd gen)
4.3(2,154)$97.95- Temperature & Humidity SensorsGoogle
Nest Temperature Sensor (2nd gen)
4.4(1,327)$39.98 - Temperature & Humidity SensorsGoogle
Nest Temperature Sensor
4.6(16,633)$39.00 
ThermostatsGoogleNest Learning Thermostat (4th gen)
4.4(2,596)14% OFF$279.99$239.99
ThermostatsGoogleNest Learning Thermostat
4.2(358)
- Temperature & Humidity SensorsSensi
Emerson Room Sensor
4.3(352)$45.88 
ThermostatsSensiLite smart thermostat
4.0(2,344)$64.00
ThermostatsSensiSmart thermostat
4.4(23,058)20% OFF$129.99$103.83
ThermostatsSensiTouch 2 smart thermostat
4.3(1,247)$189.52
ThermostatsSensiTouch smart thermostat
4.5(14,212)11% OFF$179.99$159.99