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Most wall dog doors are, by design, more energy efficient than other styles. One reason is that many pet doors for walls come with two flaps, one on the interior side of the dog door and one on the exterior.
No matter how energy efficient a large dog door is designed, when your pet actually uses it you will lose energy. There is no way around that. So the bigger the pet door, the more energy you will lose.
If you need a big dog door and are concerned about energy efficiency then one of our large dog doors for walls may be your best bet.
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