Hi Millie,
Thanks for reaching out to us and welcome to the community! We're excited to see that you're sharing your Nest home. I'm happy to look into this issue for you.
Creating a PIN and Lock
When you lock your Nest thermostat in Heat mode or Cool mode, you’ll set a temperature range after you create a four digit PIN. Anyone can turn the thermostat’s ring to change the temperature within the range you’ve set, but they won’t be able to set the temperature outside of your range or change any of your settings. Here is how to lock/unlock your thermostat.
Inviting users to your Google Home
If you sign into the Nest app with a Google Account, you can manage home members in the Home app. Keep in mind that only home members who also sign in with a Google Account will be able to see your Nest products in the Nest app.
Family accounts let other people share access to your home and your Nest products in the Nest app. Depending on the level of shared access you choose, people you invite can add, remove, and control Nest products in the Nest app. You can customize access privileges for them through this guide.
There isn't a guest mode yet available on the thermostat itself, but we will send your feedback onto our developers. 🙂
Let us know if we can help with anything else.
-From Garrett DS, Community Specialist.
