![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. :
![Installing new Amazon smart thermostat from a RWG non-smart Honeywell...I have a C wire but on the HVAC there are already 2 wires (red and blue) in the C connection on the Installing new Amazon smart thermostat from a RWG non-smart Honeywell...I have a C wire but on the HVAC there are already 2 wires (red and blue) in the C connection on the](https://preview.redd.it/s6hk8xkhg9y71.jpg?width=3180&format=pjpg&auto=webp&s=bf0d76a458c03c2c838e10db30c7f164c4bf0701)
Installing new Amazon smart thermostat from a RWG non-smart Honeywell...I have a C wire but on the HVAC there are already 2 wires (red and blue) in the C connection on the
![Questions about how to wire a new honeywell smart thermostat to replace old...lots of wires at furnace : r/hvacadvice Questions about how to wire a new honeywell smart thermostat to replace old...lots of wires at furnace : r/hvacadvice](https://preview.redd.it/yvqvwi63z8871.jpg?width=3024&format=pjpg&auto=webp&s=c217b2d47a9997e7c693d232b083312df3719d1b)
Questions about how to wire a new honeywell smart thermostat to replace old...lots of wires at furnace : r/hvacadvice
![KING ES230-R MAX22 Electronic Line Voltage Non-Programmable Thermostat, 3- Wire, 208/240V, 22A - Programmable Household Thermostats - Amazon.com KING ES230-R MAX22 Electronic Line Voltage Non-Programmable Thermostat, 3- Wire, 208/240V, 22A - Programmable Household Thermostats - Amazon.com](https://m.media-amazon.com/images/I/619dPEb8t-L._SY350_PKmb-play-button-overlay_.jpg)