Cooling the server area 2.0

Years ago .. almost 10 !!! I did set up a cooling system for the server area, basically a under stairs area in garage. 

Is time to try to improve the system.

Server chronicles - HA temporary server (UPDATED)

Among many other services, my server hosts some HA services to control my X10 lights and some operations.
Since my glorious server need to be rebuilt and as usual I don't have time, I needed to find a quick solution for my X10 server.
I decided to use a spare Raspberry I have around and create a temporary HA server, until the main one will be restored.