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My air-conditioning system is so old that no modern thermostat is compatible with it. The control panel is a just a bunch of mains-voltage switches that turn the various parts on and off.
So I've been designing a PCB that just replaces the physical switches with a bunch of relays, controlled by an ESP8266 or similar. But it's taken me three years to get to this point because I lack the electronics expertise to not set something on fire, or blow it up!
Ultimately, I stumbled across a company in Norfolk that makes exactly what I've been trying to design, but with all the fancy stuff like snubbers for inductive loads, etc. So I bought one a couple of weeks ago and I've been working on the software since then.
At this point, I can control all functions from my phone when I'm on the local network (you can see part of the interface in one of the photos), but the next steps are a Google Assistant integration and some extra features like humidity triggering, auto-off when no one is in the house, etc.