This unit along with the heated pad are a life saver for outdoor kitties and strays.  A stray in my neighborhood was afraid at first but I put feed in there for a few days and the cat went right in.  Stayed in there on rainy, cold days as well.  Love this and hope everyone taking care of strays will get one.  More than one cat can stay in this unit.  (The stray that used this condo is now adopted and stays indoors) .