Check the temperature and humidity of a room
HomePod mini and HomePod (2nd generation) have a temperature and humidity sensor, so you can ask about the temperature and humidity in the rooms where they’re placed.
Say something like “Hey Siri, what’s the temperature in here?” or “Hey Siri, what’s the humidity in the basement?”
Note: Temperature and humidity sensing is optimised for indoor domestic settings, when ambient temperatures are around 15º C to 30º C and relative humidity is around 30% to 70%. Accuracy may decrease in some situations where audio is playing for an extended period of time at high volume levels. HomePod requires some time to calibrate the sensors immediately after starting up before results are displayed.