Updated October 2026
Data from the official Ecobee and Sonoff sites.
2026 verdict
If the reading has to be visible on the device and not only in an app, the Sonoff SNZB-02DR2 AirGuard TH wins this matchup.
It is a standalone Zigbee and Bluetooth sensor with a 3.6 inch LCD, measuring temperature and humidity with alerts, six months of history and a 2 year warranty, and it works with any Zigbee hub as well as Alexa, Google Home and SmartThings. The Ecobee SmartSensor counters with a longer rated battery, a 3 year warranty and occupancy detection, but it is tied to an ecobee thermostat and measures no humidity. Pick the Sonoff for a general-purpose, screen-first sensor, and the Ecobee to add room awareness to an ecobee system.
vs
Winner
$14.90
Also sold in packs
- Pack of 2$28.90$14.45 per unitYou save $0.90Buy
- Pack of 2€28.90€14.45 per unitYou save €0.66Buy
- Pack of 2£24.77£12.38 per unitYou save £0.77Buy
- Pack of 2Buy
- Pack of 2Buy
- Pack of 29% OFF€29.14€32.06€14.57 per unitYou save €0.92Buy
- Pack of 2Buy
- Pack of 2Buy
- Pack of 2€34.02€17.01 per unitYou save €4.62Buy
- Pack of 2Buy
- Pack of 2Buy
News by email
Still comparing? Get what's new by email
New releases and the smart home news worth knowing, in your inbox.
No spam. Unsubscribe in one click.
| Feature | Ecobee SmartSensor | Sonoff SNZB-02DR2 AirGuard TH | Winner |
|---|---|---|---|
| Price | $97.95 | $14.90 | Sonoff SNZB-02DR2 AirGuard TH |
| Rating | 4.6 | 4.4 | Ecobee SmartSensor |
| Warranty | 3 years | 2 years | Ecobee SmartSensor |
| Connectivity | Other | Bluetooth, Zigbee | Sonoff SNZB-02DR2 AirGuard TH |
| Screen | NO | YES | Sonoff SNZB-02DR2 AirGuard TH |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Sonoff SNZB-02DR2 AirGuard TH |
| Alerts | Temperature Alerts | Temperature Alerts, Humidity Alerts, Low Battery Alerts | Sonoff SNZB-02DR2 AirGuard TH |
| Sensors | Temperature, Occupancy | Temperature, Humidity | Tie |
What the differences mean
What it senses
The Sonoff SNZB-02DR2 AirGuard TH reads temperature and humidity and keeps history with dew point and VPD. The Ecobee SmartSensor reads temperature and detects occupancy, which is a different pair of senses: one measures the air, the other measures whether the room is in use.
Standalone or accessory
The Sonoff SNZB-02DR2 AirGuard TH works on its own in Proximity Mode over Bluetooth and joins any Zigbee hub for the full feature set. The Ecobee SmartSensor has no Wi-Fi, Bluetooth, Zigbee, Z-Wave or Thread and talks only to an ecobee thermostat over a proprietary radio.
Display
The Sonoff carries a 3.6 inch LCD showing the live reading and the 24-hour highs and lows. The Ecobee SmartSensor has no screen, so its reading exists on the thermostat, in the app or in an automation.
Battery and warranty
The Ecobee SmartSensor runs on a single CR2477 rated for about five years and carries a 3 year warranty. The Sonoff SNZB-02DR2 AirGuard TH uses two AAA cells, for which Sonoff publishes no rated life, and carries a 2 year warranty.
Smart home reach
On a gateway the Sonoff SNZB-02DR2 AirGuard TH answers Alexa, Google Home and SmartThings and reaches Apple Home and Matter through Sonoff's bridges. The Ecobee SmartSensor integrates through its thermostat, which supports HomeKit, Alexa, Google Home, SmartThings and Home Assistant, but the sensor itself is not exposed and there is no Matter.
Which one to buy if
- you want humidity as well as temperature
The Sonoff SNZB-02DR2 AirGuard TH measures humidity; the Ecobee SmartSensor does not.
- you want the number on a screen in the room
Its 3.6 inch LCD shows the reading and 24-hour highs and lows, while the Ecobee has no display.
- you already own an ecobee thermostat and want room priority
The Ecobee SmartSensor adds occupancy detection so the thermostat averages or prioritises the rooms people are in.
- you want a battery you rarely think about
The Ecobee's single CR2477 is rated for about five years, far longer than the Sonoff cells follow in practice.
- you want a sensor that works with any Zigbee hub
The Sonoff SNZB-02DR2 AirGuard TH joins Zigbee2MQTT, ZHA or any Zigbee 3.0 coordinator, with no brand lock-in.
$97.95
- + Rating: 4.6
- + Warranty: 3 years
- - Price: $97.95 vs $14.90
- - Connectivity: Other vs Bluetooth, Zigbee
Winner
$14.90
- + Price: $14.90
- + Connectivity: Bluetooth, Zigbee
- + Screen: YES
- - Rating: 4.4 vs 4.6
- - Warranty: 2 years vs 3 years
What owners say
Owners of both sensors like how quickly they pair and how effectively they fix a room that never matches the rest of the house, and both groups say setup takes only a few minutes. Ecobee SmartSensor owners single out the occupancy detection that stops the system conditioning empty rooms and the single CR2477 cell rated for around five years, while a few in large multi-story homes report spotty range to a thermostat two floors away and find the price high for what is a small puck. Sonoff SNZB-02DR2 AirGuard TH owners talk up the big 3.6 inch display readable from across a room, the AAA cells, the temperature and humidity alerts and the six months of history with a free CSV export, while noting that settings only apply after the button on the back is pressed and that the app can lag behind the screen. Only the ecobee group reports a range limitation; only the Sonoff group reports the configuration quirk.
Frequently Asked Questions
Which is better overall: Ecobee SmartSensor or Sonoff SNZB-02DR2 AirGuard TH?
For a general-purpose sensor, the Sonoff SNZB-02DR2 AirGuard TH: it reads temperature and humidity, has a 3.6 inch screen, alerts, history and any-hub support. The Ecobee SmartSensor is the better choice only inside an ecobee system, where its occupancy detection and five-year battery make it a strong companion.
What is the biggest difference between the Ecobee SmartSensor and the Sonoff SNZB-02DR2 AirGuard TH?
The Ecobee SmartSensor is a closed accessory that measures temperature and occupancy for an ecobee thermostat, while the Sonoff SNZB-02DR2 AirGuard TH is a standalone Zigbee sensor that measures temperature and humidity and shows them on its own display.
Does the Sonoff SNZB-02DR2 AirGuard TH work with ecobee thermostats?
No. The Sonoff SNZB-02DR2 AirGuard TH joins a Zigbee network and works with Alexa, Google Home, SmartThings and Home Assistant, or with Apple Home and Matter through a Sonoff bridge. It has no ecobee integration.
Does the Ecobee SmartSensor measure humidity?
No. The Ecobee SmartSensor measures temperature and detects occupancy, and it does not measure humidity, air quality or pressure. The Sonoff SNZB-02DR2 AirGuard TH is the one of the pair that reads humidity.
How long does each battery last?
The Ecobee SmartSensor runs on a single CR2477 rated for about five years. The Sonoff SNZB-02DR2 AirGuard TH runs on two AAA cells and Sonoff publishes no rated life for it, so owner experience varies.
Who should buy which one?
Buy the Sonoff SNZB-02DR2 AirGuard TH for a screen-first temperature and humidity sensor that works with any Zigbee hub. Buy the Ecobee SmartSensor to add occupancy-based room priority and a long-life battery to an existing ecobee thermostat.
Our store on AmazonShop our ideas on AmazonLists of the smart home setups we would put together ourselves, ready to add to your Amazon cart.Shop on AmazonFull comparison table
Compare all 36 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.
- 36 Temperature & Humidity Sensors
- 43 specs compared
- 39 filters
- Temperature & Humidity Sensors
Smart Wireless Thermometer Hygrometer
4.7(921)$18.99 - Temperature & Humidity Sensors
SNZB-02UL AirGuard E-Ink TH
4.7(118)$24.90 - Temperature & Humidity Sensors
Nest Temperature Sensor
4.6(16.6K)£44.56 - Temperature & Humidity Sensors
SmartSensor
4.6(8.8K)$97.95 - Temperature & Humidity Sensors
Meter Pro
4.6(719)$19.99 - Temperature & Humidity Sensors
15% OFFMeter Plus
4.5(3.6K)$15.29$17.99 - Temperature & Humidity Sensors
Hygrometer Thermometer H5104
4.5(2.1K) - Temperature & Humidity Sensors
Multipurpose Sensor
4.5(366)$37.99 - Temperature & Humidity Sensors
Nest Temperature Sensor (2nd gen)
4.4(1.3K)$39.98 - Temperature & Humidity Sensors
SNZB-02DR2 AirGuard TH
4.4(684)$14.90 - Temperature & Humidity Sensors
23% OFF
Smart WiFi Indoor Thermometer
4.4(164)$11.49$14.99 - Temperature & Humidity Sensors
23% OFFSTH0B Smart Thermometer Hygrometer
4.4(164)$11.49$14.99 - Temperature & Humidity Sensors
BLU H&T ZB
4.4(138)$22.99 - Temperature & Humidity Sensors
BLU H&T Display ZB
4.4(73)$25.99 - Temperature & Humidity Sensors
SNZB-02WD
4.3(581)$19.90 - Temperature & Humidity Sensors
Emerson Room Sensor
4.3(357)$45.88 - Temperature & Humidity Sensors
Meter
4.2(15.3K)$13.99 - Temperature & Humidity Sensors
15% OFFIndoor/Outdoor Thermo-Hygrometer
4.2(10.2K)$12.74$14.99 - Temperature & Humidity Sensors
Temperature and Humidity Sensor
4.2(5.6K)$19.98 - Temperature & Humidity Sensors
LCD Smart Temperature Humidity Sensor
4.2(3.4K)$15.90
- Air Quality Monitors
8% OFFSmart Thermostat Premium
4.3(4.2K)$239.97$259.99 - Cameras
SmartCamera
4.0(1.3K)£140.04 - Doorbells
25% OFFSmart Doorbell Camera
4.1(1.1K)$119.99$159.99 - Door & Window Sensors
17% OFFSmartSensor for Doors & Windows
4.2(1.3K)$49.99$59.99 - Temperature & Humidity Sensors
SmartSensor
4.6(8.8K)$97.95 - Thermostats
5% OFFSmart Thermostat Enhanced
4.4(3.7K)$189.98$199.99 - Thermostats
Smart Thermostat Essential
4.2(1.9K)$139.00 - Thermostats
8% OFFSmart Thermostat Premium
4.3(4.2K)$239.97$259.99
- Air Quality Monitors
SAWF-07P Air Quality Monitor
3.8(198)$39.90 - Air Quality Monitors
SAWF-08P Air Quality Monitor
4.3(174)$49.90 - Buttons
RM433R2 Remote Controller
4.2(15)€16.95 - Buttons
SNZB-01P Zigbee Wireless Switch
4.2(976)$16.90 - Cameras
CAM GlassView
3.9(59)$34.90 - Cameras
Cam Outdoor DUO
4.2(4)$79.90 - Cameras
Cam Slim Gen2
4.4(182)$19.90 - Cameras
30% OFFGK-200MP2-B
4.0(149)$6.99$9.99 - Displays
NSPanel Pro Gen2
3.2(11)£128.49 - Displays
NSPanel Pro
4.0(78)$129.90 - Dongles
Dongle Lite MG21
4.5(469)$24.90 - Dongles
Dongle Max
4.3(652)$42.90 - Dongles
Dongle Plus MG24
4.6(716)$35.90 - Dongles
Dongle Plus PP10
4.5(102)$35.90 - Dongles
Dongle-PZG23
4.6(180)$39.90 - Dongles
Z-Wave 800 PoE Dongle Max
4.2(31)$44.90 - Dongles
ZBDongle-E
4.7(3.8K)$24.90 - Dongles
16% OFFZBDongle-P
4.6(5.7K)$33.52$39.99 - Door & Window Sensors
DW2-WIFI
3.6(153)$12.90 - Door & Window Sensors
SNZB-04 ZigBee Wireless Door/Window Sensor
3.7(101)