HomeX Logo

Sorry, the web browser you're using is not supported by this website.

Please use Google Chrome, Firefox, Safari, or another browser to access homex.com. Thank you.

Skip to main content

We use cookies to enhance your experience. For details on how we use cookies, collect data, & how to manage your consent please see our Cookie Policy & Privacy Policy.

Ask us anything

What is the C wire on a furnace?

The wire is an additional wire that can be used to provide a return channel for 24V continuous power supply for any application. It is usually used to provide a return channel for thermostat power supply. C represents for ordinary.

Home-x logo

Let's Get It Fixed!

Our virtual experts can diagnose your issue (for free!) and resolve simple problems.

Call 1 (855) 466-3948Call now

RATE

Link copied to
clipboard.

Shop Recommended ProductsShop HomeX Recommended Products

RELATED QUESTIONS