There is no better door for energy efficiency

I am an energy auditor, so when I began searching for dog doors and eventually found this one, I was intrigued. Well, I did my research and finally bought it and am well impressed. True, it is a little tougher, initially, to push open but not too tough for my medium sized dog to manage. More importantly though, the air seal is fantastic. What a simple yet extremely clever solution to the eternal drafty pet door problem.