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Temperature & Humidity Sensors · Head to head

Ecobee SmartSensor vs Nest Temperature Sensor (2nd gen)

Full Smart Temperature/Humidity Sensors comparison in 2026

Updated October 2026
Data from Amazon and official Ecobee and Google sites.
2026 verdict
Even though both are thermostat accessories, the Ecobee SmartSensor is the more capable room sensor of the pair, because it detects occupancy as well as temperature.
Ecobee SmartSensor
Winner
Ecobee SmartSensor
$74.99$99.9925% OFF
Buy on Amazon USACheck price
It also carries a 3 year warranty against 1 year, a rated 5 year battery against 3 years, temperature alerts and support for Google Home, Alexa, Apple HomeKit, SmartThings and Home Assistant through the ecobee system. The Nest Temperature Sensor (2nd gen) is the lower priced of the two and the smaller one at 37 g, and it reports temperature alone to a Nest Thermostat, with Google Home as its only platform. Neither measures humidity or has a screen. The thermostat on your wall decides this: the Ecobee SmartSensor works only with ecobee thermostats, and the Nest Temperature Sensor (2nd gen) only with Nest.
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FeatureEcobee SmartSensorNest Temperature Sensor (2nd gen)Winner
Price$74.99$39.98Nest Temperature Sensor (2nd gen)
Rating4.64.4Ecobee SmartSensor
Warranty3 years1 yearEcobee SmartSensor
Battery Life5 years3 yearsEcobee SmartSensor
IntegrationsGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home AssistantGoogle HomeEcobee SmartSensor
SensorsTemperature, OccupancyTemperatureEcobee SmartSensor
AlertsTemperature AlertsNoneEcobee SmartSensor
ConnectivityOtherBluetoothTie
ScreenNONOTie

What the differences mean

Occupancy detection

The Ecobee SmartSensor detects whether someone is in the room, so an ecobee thermostat can focus on occupied rooms. The Nest Temperature Sensor (2nd gen) reports temperature only.

Which thermostat it needs

The Ecobee SmartSensor talks to ecobee thermostats over a 915 MHz radio, and the Nest Temperature Sensor (2nd gen) connects only to a Nest Thermostat. Neither works on its own or with the other brand.

Battery and warranty

The Ecobee SmartSensor is rated for 5 years on a CR2477 coin cell and carries a 3 year warranty. The Nest Temperature Sensor (2nd gen) is rated for 3 years on a CR2 cell and carries 1 year.

Platforms

Through the ecobee system the Ecobee SmartSensor reaches Google Home, Alexa, Apple HomeKit, SmartThings and Home Assistant. The Nest Temperature Sensor (2nd gen) is a Google Home device only.

Which one to buy if

What owners say

Owners of both sensors describe the same win: a thermostat that stops misreading the house and keeps the room people are actually in comfortable, and both groups call pairing quick. Ecobee SmartSensor owners add the occupancy detection, which they use to stop conditioning empty rooms, and a coin cell that rarely needs replacing; their complaints are spotty range across large multi-story homes and a price that feels high for a small puck, since several are needed. Nest Temperature Sensor (2nd gen) owners report lower bills from scheduling by room, and their warnings are about compatibility, with UK buyers finding it would not pair with their Nest Learning Thermostat, and pairing that sometimes hangs.

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.

  • Ecobee SmartSensor
  • Nest Temperature Sensor (2nd gen)

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Frequently Asked Questions

Which is better overall: Ecobee SmartSensor or Nest Temperature Sensor (2nd gen)?

The Ecobee SmartSensor. It adds occupancy detection, temperature alerts, a longer rated battery and a 3 year warranty. The Nest Temperature Sensor (2nd gen) is the lower priced option and the right one if your thermostat is a Nest.

Can I use the Ecobee SmartSensor with a Nest Thermostat?

No. The Ecobee SmartSensor pairs only with ecobee thermostats, and the Nest Temperature Sensor (2nd gen) only with Nest Thermostats.

What is the biggest difference between the Ecobee SmartSensor and the Nest Temperature Sensor (2nd gen)?

Occupancy. The Ecobee SmartSensor detects whether a room is in use, while the Nest Temperature Sensor (2nd gen) only reports temperature.

Do either of these sensors measure humidity?

No. Both the Ecobee SmartSensor and the Nest Temperature Sensor (2nd gen) measure temperature only, and neither has a display.

Who should buy the Ecobee SmartSensor?

Ecobee thermostat owners who want to balance temperature between rooms and skip conditioning the ones nobody is using.

Who should buy the Nest Temperature Sensor (2nd gen)?

Nest Thermostat owners who want the thermostat to follow the temperature of a specific room, at a lower cost.

Full comparison table

Compare all 36 Temperature & Humidity Sensors side by side

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