It was promised for years and it finally happened. The first smart consumer thermostat that supports remote temperature sensors, the Honeywell Home T9, is now finally HomeKit compatible.

Control the Honeywell Home T9 smart thermostat with Siri

Resideo, which owns the Honeywell Home brand, promised HomeKit support for the T9 two years ago. The company already supports Apple's smart home system in its T5 thermostat, also known as the Lyric T5. The device does not work with external sensors.

Adding HomeKit support to the T9 thermostat is huge. The sensors, according to most reviews, are very good and can even measure humidity as well as temperature. Nest and ecobee remote sensors have no support for measuring humidity. They help make sure you feel comfortable in the room you are in, not just where the thermostat is installed.

Now that HomeKit support is available, users will be able to control their Honeywell Home T9 thermostat using Siri or the Apple Home app. This opens up the possibility of using automation to adjust the temperature or just ask Siri to do it for you.

Will it matter, because Resideo should adopt the matter?

Of course, when the new Matter standard is released in 2022, this HomeKit support may not be so important. Resideo is on the board of the Connectivity Standards Alliance, which oversees Matter. Smart thermostats are in the first Matter specification, so it's quite likely that the Honeywell Home T9 will accept the standard as well.

In the meantime, however, Siri enthusiasts with T9 thermostats will be able to use the voice assistant to keep their homes warm and fresh just before the launch of Matter.