Add a storm door on the front of your house. Better yet add two, put the other one on the back door as well. But don’t just purchase any storm door; make sure you buy the kind with the disappearing screen. The one that I love is a full glass version which means that you get the maximum amount of glass window. When I lower the top glass panel I then have half glass and half screen. That way, not only will your new investment help insulate your front door and decrease the amount of leakage around your door, but every day for the next couple of months that the weather is beautiful, open up those two doors, drop the screens and enjoy cooling your house with that amazing clean air from outside. You can purchase doors that have removable panels of glass that you then replace with a full screen panel. This gives you more area for allowing the breezes to blow. For me, I have found that if I have to remember to change out and store the unused panel, I probably won’t get it done in a timely manner and will then miss out on the spring and fall breezes. I also like the option of closing the glass panel throughout the unbearable hot months of summer. I do open it up on mornings when the temperatures outside are cooler than the inside, flush the heat out of the house and then close it back up. It is good to get some fresh air into the house from time to time, especially as we begin to build our houses tighter and tighter. So when the temperature permits, forget that air conditioner, fresh air is better.