The Ecobee smart sensors accompany the Ecobee thermostat that helps regulate the temperature in your home's rooms. These sensors also include moisture and motion detection, and each feature works independently with HomeKit. This allows these small wireless sensors to work with all the devices in your HomeKit home, enabling automation such as turning on your lights when motion occurs.
$ 79 at Amazon
The Eve degree is a portable powerhouse because it can accompany you inside and out thanks to its index of resistance to water IPX3. This beautiful sensor has a sleek industrial design and an easy-to-read LCD display that can show you the current temperature, humidity and atmospheric pressure of your environment. Eve Degree uses a direct Bluetooth connection to HomeKit and can be configured in seconds with a simple analysis of its HomeKit code.
$ 58 at Amazon
The Philips Hue motion sensor is our indispensable accessory for automatically switching on and off our lights, whether we are coming or going. It also happens to have a temperature sensor. Once your motion sensor is configured with HomeKit, the temperature sensor works like any other, allowing it to work with scenes or automations and can report status via Siri on demand. Zigbee connectivity to the Philips Hue hub makes this sensor robust in terms of reliability. In addition, it is quick to react and update the status of your home.
$ 40 at Amazon
The Smart Home temperature sensor from Aqara is an affordable option that has surprising benefits. This tiny sensor signals the temperature to the home application, as well as humidity and atmospheric pressure, all in a package that you can place just about anywhere. Even though the sensor itself has a low price, you will need the Aqara Smart Home hub to add it to HomeKit, which can prove to be cost effective if you need a lot of sensors for the home.
$ 19 at Amazon
The iHome Intelligent 5-in-1 Monitor combines, wait for it, five separate sensors in a small, neat device. The temperature, humidity, motion and light sensors are all available for use with HomeKit, and a sound sensor works with the iHome app and other products. A large LCD screen with built-in backlight gives you information at a glance, and Wi-Fi lets you take full advantage of your smart home.
$ 30 at Amazon
Although the name of Onvis SMS1 includes only the motion sensor, this little guy also has temperature and humidity sensors that work with HomeKit. The SMS1 works with 2 AAA batteries and lasts up to 15,000 hours, making it a game apart. This sensor is also one of the only accessories that use Bluetooth 5 for connectivity, allowing it to achieve shorter response times and greater reach.
$ 26 at Amazon