First Nest unit, installed about 5 years ago - working fine.Second Nest unit, installed six months ago to add control for another part of the house, and hot water - absolute pile of ****.The unit continually disconnects from WiFi, resetting doesn't help. I am very happy troubleshooting tech devices, but this one has minimal info to work with. Google support is non existent.Don't waste your money on a Google Nest. I am very happy with my Google Pixel phone, and have also had good experiences with Chromebooks, but this 'learning thermostat' is a good idea, badly implemented and then not supported.