Evidently the air conditioning is doing the best it can since you say the air is very dry but still too warm.Humid 80+ would be even more uncomfortable than dry 80+ temperatures.Some fans for air movement and cool drinks are probably the easiest short-term solution.
Portable air conditions only add to the overall enviroment’s heat if they can’t exhaust the heat outside.
Twice I have had portable units rented by an employer because the main air conditioning was broken;and I thought those portables worthless:made a lot of noise and darn little comfort.WE ended up with a pedestal fan and drinking lots of ice-cooled water until the permanent unit was replaced.
Do you have static electricity problems? That could be very bad for the servers.Seriously.And could be a lever to have building management seek solutions.
I know of past workplaces where the air conditioning was only installed after computerization! Before computers the workers just had to sweat.
It could be the A/C controller is set up poorly and just needs a knowledgeable person to adjust it.I don't mean the wall controls but the main system controller which is likely computerized,unless really old.
Unless the unit is sized wrong for that building or has failed components,it is most likely adjusted improperly.