The one key difference is, in cold climates we heat our spaces and any heat that "leaks out" or is otherwise incidental is absorbed by the cold outside. In the

The one key difference is, in cold climates we heat our spaces and any heat that "leaks out" or is otherwise incidental is absorbed by the cold outside. In the hot climates, we cool our spaces, but in the process we pump extra heat outside, making it warmer when it's already too warm.