I am very satisfied with the heated kitty house. Have only had single digits so far this winter, nothing below zero, but one of my outdoor cats enjoys it every night. I modified the clear plastic door cover by cutting into thirds as colder temperatures the entry covers got pretty stiff and harder to push in or exit. The customer service folks are great. Had a zipper issue with the first one and they shipped me out a free replacement in a few days. I will buy another of these houses have no doubt.