Use geo-fencing to optimize your smart thermostat use

I was just thinking about this idea the other day. You are driving home and you know it takes 15 mins to cool down your house. So once you drive through your geofence your Nest starts to cool the house so its perfect when you get home. Genius!!! Well Done.
Really easy to use product with a nice design. Geofencing can be inaccurate so be sure to setup a slightly bigger area. It's useful because you don't have to set it up each time you leave the house.