- dark colors attract heat and are the best for winter or cold times
- more coats of paint can also attract heat
- light colors are ideal for summer because they don't attract too much heat
You also need to change your painting ideas if you live in a regularly hot or cold area. Obviously, if you are normally very hot, then dark colors will hinder you more than they will help you. This makes normally cold areas perfect for dark colors because the heat isn't really a problem.
One last thing you need to keep in mind is that your home may have a very specific color that makes it unique, so you don't want to change your entire house's design and style just to be more energy efficient.