Air movement is one of the most effective methods of cooling birds during hot weather. As air moves over a bird's hot body, heat is removed from the bird, making it feel cooler. The greater the amount of air movement, the greater the cooling effect produced. The cooling produced by air movement is real. Birds will not only think the house is cooler when exposed to air movement during hot weather, but they will continue to eat and grow as if the air temperature really is ten degrees lower than it... actually is.