Certified Refurbished Amazon Smart Thermostat

I hate the term refurbished. it may mean something with refrigerators, or car parts. but with such electronics, it is a non-term. Why? because there is nothing to refurbish. Such devices have no replaceable parts. I finally got one of the many refurbishers to explain to me how they refurbish such equipment. In this case it was a motherboard, which again has no replaceable part. They admitted that all they can do is clean it up, make sure all the sockets work, and it posts. I am sure it is a similar process for all such electronics. Most of the time when electronics are returned and there is no obvious flaw, they are intermittent or one of many functions may not work. And refurbishers NEVER check all of the functions! Such was the case with this thermo. It seemed to work OK, and, yes it was wired correctly, but the cooler never came on. everything else worked well. Contacted Amazon, they sent out another one, this time just plain used, like new. Plugged it in, boom! everything worked. Went back and forth a couple of times (is just a plug in mounting) just to make sure and the results were the same. New one worked, this one didn't. Just wanted to put a bit of clarity out there...