 What you buy depends on a few factors, such as the size of the livestock and the space. Small units focus on a single animal, and larger coolers can bring relief to an entire stall of animals. It helps with not only keeping them a bit happy, but also it helps keep their production up, meaning they're going to keep gaining weight, they're going to keep producing milk, things like that, and their energy is going to be able to go into that production instead of trying to keep themselves cool.