Tom, I've seen those ice-cooled heat exchanger units. A grow op of any decent size would eat a 5kg (10lb) bag of ice in very short order and the temperature isn't at all controllable.

These ice devices are only slightly better than evaporative or "swamp" coolers, which are of little to no use in a grow op as they dump lots of humidity into the air and lower temps only a few degrees.

Consideration #1 in a grow op is the ability to ventilate the space to get rid of waste heat from lighting, humidity transpired from the plants and to draw in fresh CO2 laden air.

If you can't ventilate a space adequately, you will always be dissatisfied with the quality and quantity of buds you pull out of it.