HA! I'm in Texas on the Gulf Coast and the first thing I though of was Air Conditioning installation.
My fishroom plans have been hijacked for the time being by a large injection of REALITY, but when I was actively in the planning stages I had plans to put a large compressor in the garage to run all the garage/air tools and to route a line into the fishroom via the attic. This would have done basically the same as your overhead installation, plus I wouldn't have to hear the compressor inside the house. Since all my water lines in the house are also routed through the attic, I had planned on tapping into those as well to have a direct access to water in the room.