Control your home on HomePod
If you have smart home accessories such as lights, thermostats, and window shades, HomePod acts as a home hub, letting you control those accessories with your voice when you’re at home or with the Home app on iPhone, iPad, Mac, or Apple Watch when you’re away from home. With HomePod, you can trigger your accessories automatically, based on time of day, your location, or the action of another accessory, such as a sensor. Set up these accessories in the Home app on your iPhone or iPad and they will automatically work with Siri on HomePod.
The requests and automations that work with HomePod depend on which smart home accessories you’ve set up using the Home app. For details, see the Home app 
section in the iPhone User Guide or iPad User Guide. For more information about smart home accessories, see the Home app webpage or tap Discover at the bottom of the Home app.
Control Apple TV using Siri on HomePod
You can use Siri on HomePod to turn on your Apple TV, start playing a favorite show, and control playback while you watch.
Siri: Ask Siri something like:
“Watch ‘Ted Lasso’ on the Living Room Apple TV.”
“Pause the Living Room Apple TV” or “Rewind the Living Room Apple TV 30 seconds.”
“Turn on English subtitles on the Living Room TV.”
“Turn off the Living Room Apple TV.”
If your connected display supports HDMI CEC, the Apple TV will also turn the connected display on or off.
Note: If the Apple TV and HomePod are both configured to the same room in the Home app, you don’t need to specify which Apple TV HomePod should control.
Control accessories using HomePod
Siri: Ask Siri something like:
“Turn on the porch light.”
“Turn off the lights in here” or “Turn off the lights in the bedroom.”
“Set the good night scene.”
“Turn on the lights at sunset everyday.”
“Is the porch light on?”
“Is the front door locked?”
To allow others to control HomePod using the Home app on their own devices, invite them to share your home, which you do in the Home app on your iPhone or iPad. For details, see Invite others to control accessories in your home in the iPhone or iPad User Guide.
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.
Ask Siri something like “What’s the temperature in here?” or “What’s the humidity in the basement?”
Note: Temperature and humidity sensing is optimized 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.