Hi, if you have My ecobee Device, you can use one of my complimentary smartapps at my github which will achieve this use case and more.
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the smartapp is called WindowOrDoorOpen and it can set your thermostat(s) to away or turn it off (not recommended for locations where a ST outage could cause mold b/c of high humidity).
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You can specify the number and frequency of notifications (for your open contacts) and if you want you can also add verbal notifications with your ST connected speakers.
My Ecobee device has many other features, see my thread under:
See my github at:
You can download My ecobee Device at my store:
www.ecomatiqhomes.com/store
Regards