PetSafe Extreme Weather Energy Efficient Pet Door, Unique 3 Flap System, White, for Dogs and Cats
To increase the energy efficiency, the PetSafe Extreme Weather Pet Door has a system of 3 flaps. It is a design that is more energy efficient than a single flap pet door. Therefore, if you live in an area prone to extreme weather, then this could be a great addition to your pet.
Of the three flaps, the one at the center acts as an insulation for temperature control. It either keeps warm or cool inside your home, depending on whether it is hot or cold outside. The door is best used by dogs with a maximum weight of 100 pounds.