Extreme Weather Door by PetSafe - In hot or cold climates, this door saves energy while giving your pal his freedom. If you live in a location with an extreme climate, you’ll love this door. This 3-flap pet door keeps extreme hot and cold weather out of your home while giving your pet the freedom to come and go. This well-designed door has a maximum energy efficiency that’s 3-½ times higher than the standard single-flap pet doors.