Human beings aren’t the only ones to suffer during summer temperature spikes. Animals housed in outdoor pens or buildings open to the fresh air can also fall prey to heat stroke when they don’t have adequate cooling. Evaporative swamp coolers can provide relief for dogs, horses, and other animals housed in stables, kennels, and outdoor pens. Using only fresh air and water to create cool, moist air, these units are extremely durable, feature casters for easy transporting and placement, and are easy to maintain.