Simple Steps to improve your home efficiency
The best advice here is to make sure your home is sealed. Transfer of air in and out of your home causes increased stress on the overall efficiency of the house. Especially the heating and cooling system. Not only that but it also effects your comfort.
My one critique is that they did not discuss insulation nearly enough. Current regulation for attic insulation is R-39. This too helps increase your efficiency AND comfort (ie. less hot and cold spots).