Add Yahoo as a preferred source to see more of our stories on Google. Hand holds a phone with the Nest app next to a Nest thermostat on a screen indicating HVAC running time - oasisamuel/Shutterstock ...

The biggest problem for people was the app, where more than half of the issues were reported. Others couldn't log in and some ...

Changes in the temperatures outside may have you fiddling with the thermostat inside. During certain seasons, you may want to set your thermostat to a specific temperature to save on your energy costs ...