When reading the product description it said it was designed for windows 27” and wider. Our windows, in every room in our house, are 27”. But when we tried to put the bed up we had to slightly bend the bed like it was 2” wider than our windows. So it kept popping the suction cups off the window. The only way my cat can use it is having it lodged behind and on top of our dog’s kennel (it’s a good thing they like each other).