I haven't really considered heat to be honest, I could have it in the garage but dust might be an issue as would extending a lot of cables.I have an 18U rack in the garage with my NAS and homelab kit in. It could theoretically house my UniFi gear in the same spot in the house but I was having heat issues with the cupboard door closed. Having the door open lost me wife points. Plus it wasn't particularly easy to get around the back of it.
It's in the under stairs cupboard at the minute, NAS just on the floor beside a 6u cabinet.
Maybe multiple locations is a good idea.
Cables being short means the patch panel and switch are best in that location, but then I could have my DM SE and NAS in the garage connected to the switch with a 10GB DAC.
The hardware that's more likely to need messing with is then easier to access in the garage as well.
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