The best exterior house paint would be a water-based one, also known as latex-based. Research shows that this expands and allows water vapor, produced from inside the house, to escape.
In contrast, oil-based paints, once dried, are inflexible and block the moisture in, which can result in cracks and blistering. Water-based paints are also better for the environment. Another factor in choosing a paint is picking one with a quality pigment, such as titanium dioxide. This means that fewer coats will be required. Other good indicators of a quality paint are a high percent of solids and an all-acrylic binder. For more information go to thisoldhouse.com.