You should repaint the exterior of your home about every three to four years so your colors are bright and the paint is not coming off leaving you with an ugly scene. When painting your house, start off in the early morning where the paint will not dry too fast. If you are painting in temperatures over ninety degrees, your paint may dry too fast and leave streaks, you would benefit from painting from the early morning hours until about one oclock and then starting again after four when the high temperatures drop a bit.