Here’s a short video showing our prototype preFree cooler. This is an outdoor unit with a pyramid of heat exchangers and fan to draw the air through. Water passes through the heat exchangers and is cooled to within 1-2 degrees C of ambient air temperature. This water is then returned to the heat exchanger on the inside unit. If we need 22 degree air inside, we need 21 degree water. To create 21 degree water with the preFree the outside air temperature would be 19-20 degrees. We can achieve such efficiency through the use of our patented megaChannel Heat Exchangers.