We are in Texas, so the summer was really booger. All any of our calves had this summer was fans and misters. At several shows we had people ask if they had been in coolers, so yes the misters will work, but not on their own, even with the misters you need to rinse and work that hair at least once, if not twice a day. Some things to keep in mind with misters, if you have hard water, you may need to put a filter in the line just before the mister, those are tiny little holes in order to make that fine mist, and it doesnt take much at all to clog them. If they get clogged soak them overnight in vinegar, I also accidentally found that blade cleaning solution works really well to. If your misters run continuously then they tend to make a mess of your barn, which can counteract all the work to grow the hair, I put mine on timers and set them to run about 10-15 minutes every 20-30 minutes. It kept them cool and kept from making such a mess in the barn.