Warning: Nest (and similar connected appliances are surveillance systems sold as an appliance. The business model of Nest and similar connected devices is to get something into your home to collect and sell data on what you and your family do at home 24x7. If you like that kind of monitoring by strangers and the security risk that the data will be stolen someday and used to target you by criminals and hackers, buy it. Note that the worst data and network security risks these days come from the relatively immature "internet of things" devices like this that are not as well protected or patched as phones and computers.
If you can find a model that you are sure allows only you to connect to it, that might be safer. But then how would the vendor apply security patches ... ? Can of worms.
(full disclosure: I work for a software company, not a Luddite. I know how these people think.)
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