I know, my smart plug reports around 60€ a month of costs. Most of it comes from the massive amount of hard drives, I try to pay most of it myself with money from side projects. Anyway, I couldn't find rentable dedicated servers with this much storage for less than 50€ a month, the upfront costs of new, energy efficient and powerful hardware is too much, and I truly enjoy running these servers myself.

About the noise, my room has a small mechanical room and that's where the servers are located, the noise can't be heard from the rest of the room.