The Custom skill allows you to voice control your Ambi Climate in Comfort mode similar to the way you'd use the app. This requires you to invoke the skill by adding "tell/ask Ambi Climate" and to specify a room.
You can switch on to Comfort mode, give feedback and also switch off.
Click here to see known custom skill commands.
Custom Action is also able to recognize the voice of the user. If you have setup your Google Home Assistant, you can share the device to your family members. As long as their phone is on the same WiFi network as that of the device, they will be able to search and link to it. Follow the setup steps to link the Custom Action and their Ambi Climate app account. Don't forget to have them train their voice models!