

I think the best question to ask first is ‘what kind of server?’
A web server could run a reasonably busy low-tech web2.0 blog site on a phone, I think without breaking a sweat.
Other types of serving (media, especially) would be resource limited) maybe not.
And there is an important difference between ’novelty’ and ‘demo’. Even a novelty server can demonstrate new ways to think about tech. Maybe an author could host their book launch on such a setup, serving only a single file and showing that we don’t exactly need to involve Amazon. That’s where my head goes when thinking about these efforts.





This suggestion depends on your skill level and desire to be completely free of corporate bs.
The ‘smart’ is already in home assistant. You do not need a smart thermostat at all. Instead you need temperature/humidity sensors and actuators for your HVAC system. There are several decent smart climate control integrations already and a library for PID control if you want to make your own control automations.
Of all the smart things out there, a thermostat is completely unnecessary. The only solid reason to buy one is convenience, if one is just not into thinking about it too much.
If privacy and autonomy are a priority, however, this is low-hanging fruit to declare independence from corporates who like to rummage through your underwear drawer.