The Aqara Climate Sensor W100 strikes an impressive balance between precision, versatility, and ease of use. It features a bright and responsive 3.4-inch LCD display that delivers realtime temperature and humidity readings, allowing you to check indoor conditions at a glance.
Adding to its appeal, the device includes three programmable buttons, ideal for adjusting HVAC settings or triggering smart home scenes with a simple tap, double tap or long press.
Table of contents
Thanks to native support for both Thread and Zigbee, the W100 integrates seamlessly with Matter enabled ecosystems. Whether you’re using Apple HomeKit, Home Assistant, or Google Home, it offers a smart, energy-efficient way to automate climate control across your home.
Aqara Climate Sensor W100 Thread or Zigbee?
Out of the box, the W100 operates over Thread, making it fully Matter-compatible. This enables wide ranging platform support and future proof connectivity.
However, if you’re already invested in the Aqara ecosystem, switching to Zigbee unlocks additional capabilities, such as remote thermostat control, multi room climate monitoring, and finer control over sensor behaviour.
Our own Aqara setup is powered by the superb Aqara M3 Hub [affiliate]. For the Aqara W100 we opted for a slightly different approach only using Matter over Thread.
That said, opting for Zigbee offers one particularly bonus with the ability for the display to show a second set of data. This could be a readings from another Aqara sensor or even the local weather. This is ideal for keeping additional tabs on others area of the home such as our personal favourite, the Greenhouse.
Aqara W100 Apple HomeKit Integration
Adding the W100 to Apple HomeKit is straightforward (see our guide, Getting Started with Apple HomeKit).
It’s worth noting that the Matter QR (and Aqara) QR codes are under the backplate of the device. There is an also a copy of the Matter code in the manual which I cut out and attached to the back of the device with clear tape for future convenience.
Once paired, the W100 appears in the Apple Home App as two separate accessories: one for the climate data and another for the programmable buttons. 3 buttons, 9 permutations, press, double press and long press. Temperature and humidity readings are clearly visible at the top of the respective room’s control view.
Aqara W100 Home Assistant Integration
You can pair the Aqara W100 directly with Home Assistant. if you have already added it to Google Home or Apple Home begin by placing it into pairing mode.
In my case, HomeKit the system generates a pairing code, copy this. Then, in the Home Assistant Companion App, navigate to Devices > Matter > Add New Device, and select “Add a device already set up.” When prompted, enter the copied pairing code.
The Aqara W100 shares battery level information over Matter as well, allowing us to create custom battery alerts through Home Assistant automations.
Aqara Climate Sensor W100 Triple Smart Buttons
The W100’s three physical buttons are a standout feature. Fully Matter-compatible in HomeKit, they support smart scene activation or individual device control.
Each button supports three types of press: single, double, and long press, thus offering nine programmable actions in total.
Buttons One and Three are marked with + and – indicators, which is especially useful for thermostat adjustments. These symbols can be ignored for other applications / automations. Just be aware HomeKit reported the buttons is a slightly strange order, the middle button was 1, bottom 2 and top is 3.
The flexibility here is fantastic, the W100 is like a mini wall mounted control panel, better still the device can actually be easily wall mounted. We haven’t managed to use all nine slots yet, though it’s tempting to find new uses.
Our Aqara W100 Buttons
This is our initial permutation of button automations in HomeKit. We will find a routine for that unassigned option eventually.
| Button | Press Type | Action |
| One | Single | Lights to Low |
| Double | Lights to High | |
| Long Press | Lights Off | |
| Two | Single | Turn on TV and Apple TV |
| Double | Turn off TV and Apple TV | |
| Long Press | (Unassigned) | |
| Three | Single | Turn on Xbox and TV |
| Double | Turn off Xbox and TV | |
| Long Press | Turn off Xbox, turn on Apple TV |
Aqara Climate Sensor W100 Impressive Accuracy
The W100 delivers highly accurate climate readings: ±0.2℃ for temperature and ±2% RH for humidity. It’s a real advantage having the data displayed on a screen.
The W100 screen refreshes in real time to two decimal places, so there’s no need to reach for your phone or ask a voice assistant for updates.
I added the W100 to Home Assistant and compared its readings against another temperature and humidity sensor in the room. Running on battery power, the W100 reports updates when it detects stable changes in temperature or humidity.
In terms of tracking both metrics, the two devices showed consistent trend lines, confirming the Aqara W100’s accuracy.
Even at the largest points of difference, there was no real cause for concern. In fact, it’s impossible to say which of the two devices is displaying the truly accurate temperature. The fact is, at less than a degree of difference in temperature both can be relied on.
The key takeaway here is that the W100 accurately tracks the same trend line as my powered thermostat just a few meters away. Who is to say the wall mounted thermostat is accurate however. The fact the trends are the same and there is less than a degree difference I have full confidence in using W100 data to manage home automation triggers.
For example, I’ve now shifted control of the dehumidifier to the readings from the Aqara Climate Sensor W100. [Ad] I’ll continue fine tuning this automation over the next week or two, but I’m confident in the reliability of the W100’s data.
Aqara Climate Sensor W100 Conclusion :
With dual CR2450 batteries delivering up to 28 months of operation — whether you’re using Thread or Zigbee, the Aqara W100 [Ad] is a true powerhouse of data monitoring and control.
Zigbee users gain an extra advantage with the ability to customise reporting intervals, offering further optimisation for battery life. After just two days of testing, I’m seriously considering a full shift to Zigbee to take full advantage of these benefits.
Displaying real time data from two highly accurate climate sensors on a crisp, easily readable screen, the Aqara W100 [Ad] excels both as a sensor and a smart home controller. Its intuitive three-button, nine-option interface makes it a standout for anyone serious about comfort, automation, and energy efficiency.
We purchased our Aqara W100 from Amazon [Ad] on launch day, and it immediately impressed with its accuracy, design, and value for money, so much so that we ordered a second unit the very same day. For anyone looking to elevate their smart home environment, the Aqara W100 is a highly compelling choice.
Links:
The following are Amazon affiliate links and help cover the cost of running this website.
The Aqara W100 on Amazon
Aqara M3 Hub
New Aqara M100 Hub
Other Aqara Reviews:
The Aqara Smart Lock U200
Aqara Presence Sensor FP2
Aqara Roller Shade Driver
Discover more from The Smart Home Blog
Subscribe to get the latest posts sent to your email.
