It will probably run even in a Pi Model 1, it’s just going to be a bit slow to interact with, and you’re not going to be able to do anything more complicated like enable the voice support (which you probably don’t want anyway, because I think it’s dependent on internet access for that, and then we’re back to the same problem as Alexa, although I don’t use it myself so I can’t say for sure).
It will probably run even in a Pi Model 1, it’s just going to be a bit slow to interact with, and you’re not going to be able to do anything more complicated like enable the voice support (which you probably don’t want anyway, because I think it’s dependent on internet access for that, and then we’re back to the same problem as Alexa, although I don’t use it myself so I can’t say for sure).
Saving the idea for a spare weekend. Cheers!
For when you get bored:
https://www.home-assistant.io/installation/raspberrypi/