![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
![Honeywell home ventilation system with no c wire for thermostat. How can I substitute the g for the c without blowing a fuse? - Home Improvement Stack Exchange Honeywell home ventilation system with no c wire for thermostat. How can I substitute the g for the c without blowing a fuse? - Home Improvement Stack Exchange](https://i.stack.imgur.com/nqLQO.jpg)
Honeywell home ventilation system with no c wire for thermostat. How can I substitute the g for the c without blowing a fuse? - Home Improvement Stack Exchange
![Amazon.com: Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat, 7 Day Programmable, Touch Screen, Energy Star, Alexa Ready, C-Wire Required, Not Compatible with Line Volt Heating Gray : Home & Kitchen Amazon.com: Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat, 7 Day Programmable, Touch Screen, Energy Star, Alexa Ready, C-Wire Required, Not Compatible with Line Volt Heating Gray : Home & Kitchen](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/81iSTdLWl4L.jpg)
Amazon.com: Honeywell Home RTH9585WF Wi-Fi Smart Color Thermostat, 7 Day Programmable, Touch Screen, Energy Star, Alexa Ready, C-Wire Required, Not Compatible with Line Volt Heating Gray : Home & Kitchen
![N1 Common C Wire Adapter AC Transformer 24V 500mA Universal Compatible With WIFI Smart Thermostat and Doorbells. Nest, Ring, Honeywell, Ecobee, Sensi - White, New - Walmart.com N1 Common C Wire Adapter AC Transformer 24V 500mA Universal Compatible With WIFI Smart Thermostat and Doorbells. Nest, Ring, Honeywell, Ecobee, Sensi - White, New - Walmart.com](https://i5.walmartimages.com/seo/N1-Common-C-Wire-Adapter-AC-Transformer-24V-500mA-Universal-Compatible-With-WIFI-Smart-Thermostat-Doorbells-Nest-Ring-Honeywell-Ecobee-Sensi-White-Ne_f8863ff8-f2ff-4a3d-9a67-38e8bdd5be59.6d13dff0e6b9cea7329179d188ec79bf.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
N1 Common C Wire Adapter AC Transformer 24V 500mA Universal Compatible With WIFI Smart Thermostat and Doorbells. Nest, Ring, Honeywell, Ecobee, Sensi - White, New - Walmart.com
![Substitute Extra Wire for C-Wire -- Install the Honeywell Wi-Fi smart thermostat with this video. - YouTube Substitute Extra Wire for C-Wire -- Install the Honeywell Wi-Fi smart thermostat with this video. - YouTube](https://i.ytimg.com/vi/O1ah91Gmnyk/maxresdefault.jpg)
Substitute Extra Wire for C-Wire -- Install the Honeywell Wi-Fi smart thermostat with this video. - YouTube
![Does anyone know I can install a smart thermostat without additional wiring? How can I tell if the blue wire is the C wire? It's an air handler for a/c only. : Does anyone know I can install a smart thermostat without additional wiring? How can I tell if the blue wire is the C wire? It's an air handler for a/c only. :](https://preview.redd.it/x4o2gcbyfym91.jpg?width=640&crop=smart&auto=webp&s=31429b7c9e94f8a7ccdf5cba3a8bf9bc94e7629e)
Does anyone know I can install a smart thermostat without additional wiring? How can I tell if the blue wire is the C wire? It's an air handler for a/c only. :
![Substitute G-Wire for C-Wire -- Install the Honeywell Wi-Fi smart thermostat with this video. - YouTube Substitute G-Wire for C-Wire -- Install the Honeywell Wi-Fi smart thermostat with this video. - YouTube](https://i.ytimg.com/vi/jyO2yLpu3jE/sddefault.jpg)
Substitute G-Wire for C-Wire -- Install the Honeywell Wi-Fi smart thermostat with this video. - YouTube
![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
![Substitute G-Wire for C-Wire -- Install the Honeywell Wi-Fi smart thermostat with this video. - YouTube Substitute G-Wire for C-Wire -- Install the Honeywell Wi-Fi smart thermostat with this video. - YouTube](https://i.ytimg.com/vi/TT4vbK1K1wo/maxresdefault.jpg)
Substitute G-Wire for C-Wire -- Install the Honeywell Wi-Fi smart thermostat with this video. - YouTube
![Best smart thermostat for my heating system? Looking for recommendations that will work for this system. It appears to be lacking a “c” wire and I do not see any other wires Best smart thermostat for my heating system? Looking for recommendations that will work for this system. It appears to be lacking a “c” wire and I do not see any other wires](https://preview.redd.it/ikgxuq2s5k981.jpg?width=640&crop=smart&auto=webp&s=fb3679648b5ff176cb622df1164203b584dd58e4)