Nest Learning Thermostat 3rd Generation base - Google Store
No C-wire? Install a Nest thermostat at your own risk – Smart Thermostat Guide
Wiring , I ordered the base model nest thermostat and below is my current setup , I purchased this 24v transformer off Amazon to do c wire and the instructions says RH
Google Nest Thermostat - Smart Thermostat for Home - Programmable Wifi Thermostat - Charcoal - - Amazon.com
How to tell which Nest thermostat you have - Google Nest Help