If your house is like mine you have some rooms that run a little hotter than others (especially if you have servers running). Because of this the need to monitor temperature readings in rooms became a little more important, now there’s a multitude of different ways to tackle this problem but this is by far the cheapest (although more time consuming on the front end) and doesn’t require any cloud services to keep it running. I’d be unfair if I didn’t mention some other good alternatives that use Zigbee/ZWave if you don’t want to go through all this (these are not affiliate links, im not that important).