Maisonette Cat House | Great deals on Outdoor Cat House
Deluxe Heated Insulated Outdoor Cat House Shelter Bed | eBay
Cassette Frutta, Cassetta Frutta, Seghetto Elettrico - Fai da Te Mania
Weather changes quickly and can be rather nasty here in Ontario. There were times our cat didn't make it home before lights out and got stuck outside...
Cedar Outdoor Cat House Shelter: LEFT SIDE, SQUARE enter
How to make an insulated cat bed\house (outdoor or indoors)
Outdoor cat house Great deal>>>>>>>>>> http://amzn.to/1OToGqA
Could stack these for multiple cats. I don't know about the window in the summer but it would be good for winter.
Creative way to give your cats the outdoor space they desire. - repinned by CatGenie
My husband built one of these for our feral cat "Ghost Cat". He, and the other strays, have used it every winter and on rainy days. It is easy to make and they seem to like it.