You can also just use one of these kits to add a C wire to your thermostat.
24Volt Doorbell Transformer, C - Wire Adapter Thermostat, Compatible with Nest,Honeywell,and Ecobee Smart WiFi Thermostat, Nest Hello Ring Video Doorbell https://www.amazon.com/dp/B07RXL53K5/?tag=atomicindus08-20