What exactly is the “Precondition for ETA” event in the Nest integration and how does it work?

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Posted 3 years ago

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Here are the basics: when chosen, the “Precondition for ETA” Nest event instructs your car to ping the Nest throughout your ride home, and based upon how far away you are, the Nest will begin to warm/cool your home to the desired temperature just in time for your arrival. We like to call it "just in time heating.”

So if I create a rule using the “Precondition for ETA” Nest event, will it always assume that I’m driving home? If you were to choose the "Anywhere" location option, then yes, the rule will assume that you're headed back home (no matter where your location might be). But this is when the filters for ignition on in a certain area and for certain days/times come in handy. If you regularly drive from your office to home (Monday-Friday), you can set up a rule specifically for that. It's important to note that there is a "failsafe" in place. Every time the "Precondition for ETA" rule is triggered, you'll receive a text message, and if you reply with “UNDO” (as the text message explains), it will be cancelled. 
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