In a 102 degree temp the brood pen will sit at 91 degrees inside the brood pen area. Inside the whelping box in that temp, with 1 two inch duct was 87 degrees. A substantial change for the pup's living conditions. I have had numerous people come over and want to see my system at work. I am currently thinking of building pens with this feature, so I'm not willing to share my plans at this time. I will say it is very affordable, and with some thought can be easily done by someone else. Key words here are "copper piping", "old refrigerator", "water pump", and a "cooler"...from there you can use your imagination