The power question at our upstate NY vacation cottage is as important to us as the temperature in the winter. We use an Acu-rite hub and remote sensor system that lets us check the temperature online at any time via an Acu-rite website. We have two sensors inside and one outside. The site sends us alerts if either of the two sensors inside drop below our set limit, the sensors report a low battery, or if it hasn't heard from the sensors for couple of hours. Our two daughters live within a few miles of the cottage, so we can ask them check it out if we get an alert and take appropriate action. They check on the cottage once a week or so anyway.