imagine iso like water... and the pot like salt... it will only hold so much in suspension before it becomes supersaturated...
as it becomes more saturated it becomes a mixture of the water / salt
so at that point your "water" isnt as "strong" anymore youve lost concentration and therefore...
they dont make a mini split large enough for the application you are wanting, you would need at least a 3 tonne air handling unit to cool 12k sealed.
as for the other comment, look up a ballast flipbox. simple as that, they are a ready made thing