Another noob question: see the attached image of my thermostat. Would it be possible to switch it for a smart one? What would I have to check? If it is possible, what would you recommend? If is don't want any 3rd party app or account?
This. But...
The smart thermostat will come with a c wire. It's an adapter that can plug into a normal outlet and then run to your thermostat. Depending on your level of DIY, you can hide the wire (or the entire adapter) inside the wall to make it prettier.