Sudden changes are indeed worse than gradual changes. There are so many different setups that saying use/don't use misters, fans, evap, a/c or whatever isn't always appropriate. Those are all ideas that may or may not work for a particular situation. A yard with many huge shade trees has very different needs than one with no natural shade. Sun reflected off a block wall is different than overhead sun. Providing what your animals need to survive during weather extremes does not make them weaker. Providing cooling of some sort during 114 degree days is no different than providing an enclosed coop or barn for shelter during 0 degree weather.