If you have small windows, consider replacing them with larger windows. And if the whole house is too much to take on at once, concentrate on the sunniest side first.
And if you have an especially beautiful view, like a lake or woods or large meadow, consider converting entire sections of wall into windows to bring nature inside. It will completely change the feel of your home, both inside and out.
Enjoy the view!
Source: Michelle Schwake for Stafford Family Realtors