I previously had a door insert unit. It worked, but made my door unusable and wow was it cold from the elements here in Wisconsin. I bought two of the wall entry units and they have been very weather tight. These have two flaps, plus a gap between so creates an air gap. Works very well for us!!
Solved the problem of my dogs waking me up in the night to go out! Installed in the wall between the house and the garage (there's another *** door in the garage pedestrian door). Installation was difficult and I did hire that out rather than listen to my husband swear. Worth the price and found it on overstock for significantly less than anywhere else, including amazon. I have 3 dogs--one is 100lbs and quite tall. The large door was plenty big.
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