

First of all, only jellyfin has any overhead worth mentioning. Video is big and takes big hardware if you’re doing anything except the bare minimum. Audio support is basically free in comparison.
I actually tried the jellyfin audio streaming before I switched to navidrome. It worked, but all the apps for it were complete shit, or incredibly feature poor. Also, it had terrible album identification support for my library.
I got a lot more luckier than you. I have a single floor, three bedroom place. All I needed to get my setup to an acceptable level was a programmable thermostat.
I set my temps for warmer in the afternoon, cooler in the evening/night, and semi-warm again in the morning. It’s not perfect, but it makes getting to sleep and waking up a lot easier.