![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. :
![Google Nest Power Connector - Nest Thermostat C Wire Adapter - C Wire Adapter for Smart Thermostat - Nest Thermostat Accessories - Walmart.com Google Nest Power Connector - Nest Thermostat C Wire Adapter - C Wire Adapter for Smart Thermostat - Nest Thermostat Accessories - Walmart.com](https://i5.walmartimages.com/seo/Google-Nest-Power-Connector-Nest-Thermostat-C-Wire-Adapter-C-Wire-Adapter-for-Smart-Thermostat-Nest-Thermostat-Accessories_cfa6d5a6-cd77-4b1d-861d-307213b7ccf6.25de13c376683a62a9cd075397a2bc99.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
Google Nest Power Connector - Nest Thermostat C Wire Adapter - C Wire Adapter for Smart Thermostat - Nest Thermostat Accessories - Walmart.com
![Thermostats 24 Volt Transformer C Wire Power Adapter for Nest, Ecobee, Honeywell WiFi Thermostats, Power Supply for Nest Hello, Ring Smart Doorbells Chime - Amazon.com Thermostats 24 Volt Transformer C Wire Power Adapter for Nest, Ecobee, Honeywell WiFi Thermostats, Power Supply for Nest Hello, Ring Smart Doorbells Chime - Amazon.com](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/71qO0x7bNcL.jpg)