You can control it from anywhere with the Google home app – whether you're on an errand or on vacation.
You can even change the temperature without getting off the couch or out of bed. Just say, "hey Google, turn up the heat."
The Nest Thermostat is designed to work without a C wire in most homes, But for some systems, including heating-only, cooling-only, zone-controlled, and heat pump systems, you'll need a C wire or other compatible power accessory