I work in the IT field.I troubleshoot exactly the issues you have with heat and your equipment. Lucky for you, over the past several years I have had a growing interest in homesteading and off grid living. I cam across this idea on how to cool a structure passively. I guess the best way to describe it is thermal venting.

You will need several parts to make it work.

1. Some kind of adjustable vent near the roof of the structure.
2. Burry a 8" diamiter PVC pipe, make it maybe 100' long, in the ground, deep enough that the ground stays a constant temp regardless of season. The PVC will enter near the base or floor of the building.

The idea is that as air heats it rises to the roof and is vented. The air flow out creates enough suction to draw cool air into the building from the underground PVC pipe, thus cooling the building. Very simple , non electrical solution to your heat problem. It might work best if the underground pipe is level or slightly angled down to the building as cold air moves down slope better as it is heavier than hot air.