^ Some areas of Ohio get past 95F peak in summer. It doesn't seem wise to risk thousands in equipment and electrical setup just to avoid an air conditioner in *most* cases, except that in this case, the load is not something a mere window unit A/C can handle, nor some consumer grade window box fan either.
A window AC unit (or even a portable AC unit) isn't going to have the capability to handle the heat. This is why I suggested just running box fan in a window or two or better would be to install a couple wall mounted exhaust fans w/ shutters up high on the walls to expel the heat.
While 95F is substantially hot it's only ~25F warmer than "controlled room temperature". CPUs and GPUs are designed to run upwards of 70C (158F) or higher. A better solution would be to just upgrade the heatsink/cooling solution of the hardware to better handle the warmer ambient temperatures.
Otherwise, you're looking at installing a central air system heavy enough to handle the power load.
I really appreciate everybody's input! Maybe 5 systems with 3 cards each would be more reasonable. That would probably keep it at a point where a good size window air conditioner could properly cool it. It does get fairly warm where I'm at in the summer, but I ran some PC's in my non air conditioned garage and it seemed to run okay. Of course having a bunch in a closed shed is a totally different situation.
I've lived in Biloxi, MS and now I live in High Point, NC. Both locations I have had ample amounts of systems running throughout the year in a non-air conditioned garage without issue.
The heatsink/cooling solution on these were a lot better than normal though. For example. I ran 2 - 3, 4P AMD G34 systems. These were rack mounted motherboard w/ 4 CPUs per board. Instead of using the passive heatsinks the 2U chassis came with (or the active heatsinks some of the 3U systems had) I removed them and installed Coolermaster 212+ coolers in a dual fan configuration. This kept the temperatures in check during the 100F+ days.
In your situation though; you could easily install some wall mounted exhaust fans to help with that. The garages were not used to park cars, so they stayed closed 99% of the time. Since they were attached garages, cutting a hole in the wall for an exhaust fan was out of the question. A detached shed, on the other hand, would be more fitting for a wall mounted (or 2 or 3) exhaust fans.
100A service should be able to handle 10x 3950x systems with 4x 3080 tiered GPUs. As someone else mentioned 100A service is 240V x 100A which is 24k watts (but you shouldn't go over around 75 - 80% of that) so you're looking at around 19k of useable watts. Go big, or go home. LOL
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