"It is very unlike me to go back and review a product, but I can't say enough about this one. I have 4 dogs, 3 golden retrievers and a black lab....ages 14, 11, 4 and 2. I was skeptical about whether I could get my older dogs to use dog doors. I read a review of another customer who said, "you CAN get an old dog to do new tricks." I will second that! It took a little work (and plenty of dog cookies,) but all 4 of my dogs use the doors freely. I have a large fenced-in yard, and my girls now have the freedom to go in and out as they please. The doors are very weather-tight. I checked them with a candle when I installed them, and they don't draw a draft. Once in awhile I have to put the aluminum doors in when we have storms or big wind, but it's rare. I'm so relieved that they now can do as they please when I'm away at work. They are exhausted in the evenings, and that's a good thing!"