No C-wire? Install a Nest thermostat at your own risk – Smart Thermostat Guide
How to Wire a Thermostat - The Home Depot
Hotop C Wire Adapter 24 Volt Transformer Compatible with Nest Honeywell Ecobee Emerson Sensi Smart WiFi (White) - Amazon.com
Google Nest Learning Thermostat - Smart Wi-Fi Thermostat Stainless Steel and Nest Temperature Sensor 2 Pack BH1252-US - The Home Depot
2-Wire heat only furnace for Nest E. The Nest is having problems staying powered. Can I use an external 24V power supply? How would I route the additional wires? https://www.amazon.com/dp/B07FT2RCG9/ref=tsm_1_tp_tc : r/ Nest
Install your Nest thermostat - Google Nest Help
How to wire and set up a Nest thermostat for 2 stage Daikin/Amana heat pump - YouTube
Installing a Nest Thermostat - YouTube
Nest Thermostat with 2 wires available. Can I still install the Nest power adapter ? : r/Nest
Nest Learning Thermostat Pro Installation & Configuration Guide