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c Wire Adapter for Smart Thermostat, 24 Volt Transformer (26Ft Cable) Compatible with Ecobee, Nest and Honeywell Smart WiFi Thermostat, Ring Nest Hello Skybell August Doorbell - - Amazon.com
![furnace - Connected C-Wire (previously unused) to thermostat, but still no power? - Home Improvement Stack Exchange furnace - Connected C-Wire (previously unused) to thermostat, but still no power? - Home Improvement Stack Exchange](https://i.stack.imgur.com/zx9IU.jpg)
furnace - Connected C-Wire (previously unused) to thermostat, but still no power? - Home Improvement Stack Exchange
![Honeywell Home C-Wire Power Adapter Selectable-flexible 24-Volt Programmable Thermostat Square in the Programmable Thermostats department at Lowes.com Honeywell Home C-Wire Power Adapter Selectable-flexible 24-Volt Programmable Thermostat Square in the Programmable Thermostats department at Lowes.com](https://mobileimages.lowes.com/productimages/8c7492bd-e872-4ab6-8554-e23ac9317504/48529131.jpg?size=mpdhi)