How do I send a notification about a temperature change?

Cupertino, November 12, 2021

New Homekit user here. I bought a room temperature sensor that is connected to Homekit. I would like to be notified on the iPhone whenever the temperature drops below a certain level. The notification could be an iMessage, push notification for the app, email, etc. This seems like an obvious use case, but after searching Google for a while and seeing the various limitations, I still don't see a way to do this. Can anyone suggest how to do this?

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