I’m planning to build several WiFi connected devices for home automation: an AC remote control and air quality sensors. These devices would send data and be controlled through a local server. I’m considering two approaches: running custom software on a server PC (hardware to be determined) or integrating with Home Assistant’s protocols and purchasing their hardware. Would using Home Assistant be excessive for this use case?


Adding to this, I recommend a used mini PC. There’s lots of cheap used office hardware out there on eBay that is more powerful, more serviceable, and more flexible than the hardware they sell or a raspberry pi.
Companies are throwing away old hardware (like 8th/9th gen Core i5) that’s perfect for running Home Assistant. See if there’s an e-waste recycler near you - they might let you buy an old system for a nominal fee.
While there are some problems with used minipcs (notably drivers), i don’t think they are relevant if it is only going to be used as a Home Assistant
That’s a good point. This can help me with things like adding a DNS server (I’m assuming pi-hole can be run standalone on a mini PC)
I bought a used mini PC and then set up Proxmox. This little thing is a lot more capable than the Raspberry I used before and it runs my complete home lab, excluding my NAS.