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You could certainly have 6.
Sorry, there was a problem. Please try again later.Hard maximum of 18 units per "home" and a maximum of two "homes" per email account in the app. You can mix AC powered and battery powered units up to a max of 18. The most i've personally done was 8, this was in a semi-commercial setting. As long as your wifi network has the same SSID across the entire house, it wont be a problem at all.
Sorry, there was a problem. Please try again later.At this time, you can add a total of 18 Nest Protects to one home within the Nest account, and each Nest account can have up to two homes on it. More details here: https://nest.com/support/article/Managing-multiple-homes-and-Nest-products-with-one-Nest-Account
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