NBC/hazmat suits for how weather

I was wondering if there were any types of protective suits that allow you to stay cool in a hot climate, or in my case in summer seeing as I would overheat at any temperature greater than 10 degrees.

Does anyone here have experience with or know of such suits and where to get them?

Since you have not seen any examples that is a good indication that they are not commercially available. I have never seen
such a product and the reason is clear. They require a refrigeration unit. For cold weather it is all about retaining the heat
so layering of clothing and the right clothing material do the job. Thus you have products of all types all of the place. Carrying
a refrigeration unit even if it is light still requires a power source. And that breaks the bank.

One of those portable fridge type jobs can likely be installed in a convenient backpack, but you are not going to be able to
carry a wall socket around you. Battery technology is woefully primitive and thus heavy since the stored electrons per
atom does not exceed 2. Carrying propane or some other combustible gas or liquid to run a thermally-driven cooling unit
is not all that practical either.

Your question is actually very relevant. We are headed for a climate regime where a large part of the tropics will have wet
bulb temperatures high enough to cause mammal mortality since the evapourative cooling no longer works. We already
see such incidents in India and elsewhere, when there are temperatures reaching 50 C coupled with high relative humidity.