![HQRP 24V AC Adapter Transformer Works with Ecobee Nest Honeywell Emerson Ecobee4 Smart WiFi Thermostat C-Wire, 25ft Cable : Amazon.ca: Tools & Home Improvement HQRP 24V AC Adapter Transformer Works with Ecobee Nest Honeywell Emerson Ecobee4 Smart WiFi Thermostat C-Wire, 25ft Cable : Amazon.ca: Tools & Home Improvement](https://m.media-amazon.com/images/I/71xYPyjsBxL.jpg)
HQRP 24V AC Adapter Transformer Works with Ecobee Nest Honeywell Emerson Ecobee4 Smart WiFi Thermostat C-Wire, 25ft Cable : Amazon.ca: Tools & Home Improvement
![Old thermostat works, but I can't get the Honeywell T9 to work. T9 require C Wire that was not in the wall. I added C wire & RC wire via plug-in 120v Old thermostat works, but I can't get the Honeywell T9 to work. T9 require C Wire that was not in the wall. I added C wire & RC wire via plug-in 120v](https://i.redd.it/qgn9tccrp6a91.jpg)
Old thermostat works, but I can't get the Honeywell T9 to work. T9 require C Wire that was not in the wall. I added C wire & RC wire via plug-in 120v
![Advice on how to wire a 4 wire RGWY wifi thermostat to an old hvac with no c wire? - Home Improvement Stack Exchange Advice on how to wire a 4 wire RGWY wifi thermostat to an old hvac with no c wire? - Home Improvement Stack Exchange](https://i.stack.imgur.com/j5dG1.jpg)
Advice on how to wire a 4 wire RGWY wifi thermostat to an old hvac with no c wire? - Home Improvement Stack Exchange
![Wasserstein 24V Transformer & C-Wire Adapter Compatible with Wyze Video Doorbell Pro/Wyze Thermostat, Google Nest Thermostat, Blink Video Doorbell and Amazon Smart Thermostat : Amazon.ca: Tools & Home Improvement Wasserstein 24V Transformer & C-Wire Adapter Compatible with Wyze Video Doorbell Pro/Wyze Thermostat, Google Nest Thermostat, Blink Video Doorbell and Amazon Smart Thermostat : Amazon.ca: Tools & Home Improvement](https://m.media-amazon.com/images/I/61lu8mui0RL.jpg)