You may have an issue with keeping the A/C on. I believe it turns off automatically if the doors are shut and no one is in the driver seat. This can be overridden with the mobile app, but I'm not sure how long that lasts.
The other thing to think about is that the A/C just pumps heat from the inside of the car to the inside of your garage. This will raise the temperature of the garage, and at some point the A/C may not be able to cope, if the heat has nowhere to escape to.
This. There are tricks but without them the AC will turn off after 15 minutes, or 30 minutes if using the app.