You can share control of your Apple HomeKit home with anyone who has a valid iCloud account. These people will then be able to control all HomeKit accessories paired with the Home.
To use the Station accessory in the Home app, users do not need to have a Netatmo account.
Invitations to a HomeKit home can only be sent from the Home app.
For more information on using the Home app, go to the Apple Support page.
Updated