Go for it! Building PCs is really enjoyable experience for me and you can tailor the hardware to your needs - more memory, stronger gpu, stronger CPU, etc. Big fans at low rpm is better than smaller fan at higher rpm - it's less noisy. I'd highly suggest looking into Noctua for fans and cooling(I'm not affiliated in any way) - they're slightly expensive, but they're silent and do a great job. Don't get a GPU with "turbo fan" - they're really loud. GPU with single fan (unless low-end) is also not worth it, usually. It's very important to me to get a NVME SSD - read/write speeds can go up to 7gb/s (gb, not gbit). Don't overlook the PSU (as many people do) - you might get all kind of weird issues like GPU Coil while, random restarts, etc. If you want to get fancy, you can get into liquid cooling. At this point it does not matter as much if you'll go with AMD or Intel. Have in mind that the newest gen AMD CPUs is using different CPU sockets, so you need to find a motherboard that maches it. At this point it's not worth getting DDR5 memory - much pricier for 2-4% performance difference.
Fellow PC builder here - Noctua fans are good but aren’t the only option. My Arctic fans are whisper silent and cost a third of the price of equivalent Noctua fans.
Hey! I've made https://github.com/deepsyx/home-automation about 2 year ago, it might give you some inspiration :) It controls the lights, ac, heater and displays the current temp on mobile app
Wow! I am sure that I would want to integrate some of the ideas from your project especially the servo motors and IR emitters since I don't want to replace the existing hardware in my house.
