It often does not work. It's scheduled to be at 63 degrees until 5:30am. I sometimes awaken at 5am, run the app to set it to 68, and it says "offline". So I need to go downstairs to adjust the thermostat manually. Sorry I bought it. LATER: Tried all suggestions. Rebooted the router and Nest thermostat. It's always been about 10 feet from the router. Same 'Offline' problem. Maybe I got a lemon. Hugely disappointed and am looking to replace it with something that works.