Justin--we invested in a Port-a-Cool last spring, with the same question--would it work in Iowa. Our conslusion: yes, to a certain extent. We did not buy the biggest one available,possibly a mistake. Plus, we had 6 heifers under fans--probably asking too much of a medium sized unit. Add the fact that we had more humidity last summer than I can remember and you have sort of an unfair test! My conclusion: yes, they can help--the question remains, are they worth the cost for use in this part of the country... In all honesty, I think we had just as much luck growing hair with lots of fans and well regulated misters, but we are going to give the Port-a-Cool another try... If you do buy one, buy a BIG one!