During the first 5 years I had my cat, we lived on the third story of an old house in downtown Ann Arbor. The house did not have central air conditioning and my window unit only cooled one room. To keep the breeze flowing and my cat entertained I made a catio (cat + patio) to hangout a windows just like my window a/c unit. It was a great success and every winter I could cut the zipties and easily store the catio.
I am currently in the process of building my second catio for my new residence. This one will not be made out of wire shelving and instead look more like a a/c window unit.
Below are some photos I took of the first catio.
He's not angry, just purring.
Catio materials: Wire shelving, outdoor zip ties,plastic end caps, and a sample carpet square.
My catio is designed like a window a/c unit. The top and bottom lips hold the catio onto the window.