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We used Geek Squad to install our Nest bell and they were able to wire it to our original bell.
Sorry, there was a problem. Please try again later.The Nest Hello requires an existing chime and doorbell wiring in the home. IF the current doorbell in the home is no longer working, it's possible that a new transformer is needed. You can check for compatibility here: https://nest.com/support/article/How-to-tell-if-Nest-Hello-will-work-in-your-home
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