Network switch and dustproof enclosure in the ceiling.

[Arthur]

Yes, the atmosphere has a lot of water in it. Again, a change in temperature can cause the moisture to condense.

As you know, water itself is a very weak conductor of electricity. It is the impurities in water that conduct electricity, resulting in shortcircuits. Not the H2O itself.

I have seen a PC run underwater. Pure, distilled and deionised water. Ordinary tap water is choc-full of minerals and is ionised, so should never be brought anywhere near electricity.

Oops. Sorry for going off topic.

 

[MagicDude4Eva]

As long as he gets a switch which has passive cooling via the case. Switches generally run at 60-70 degrees. It will die if it runs over 80 for a long period and then might even become a fire hazard in the roof.

I was thinking of something like this: https://www.amazon.com/AC-Infinity-AIRPLATE-Cooling-Cabinets/dp/B009CO543S (works very well for AV cabinets - I use the version with a thermostat to control the fans)

 

[access]

have you tried powerline networking

 

[bigboy529]

have you tried powerline networking

Not personally but from what I read it's quite hit and miss, works great for some and not for others.
To run Ethernet cable threw my home with points in most rooms will be cheaper than to try and achieve the same with powerline adaptors.