Portable air-conditioners are used to cool down a particular room in the house. they are on wheels and can move from room to room. these air-conditioners vent through hoses and out windows to the outside of the house. venting a portable air-conditioner through a casement window is similar to venting it through any other type of window.. Most portable air conditioner units come with a kit that allows you to run the hose through a window, but you can also find these kits at heating and air conditioning parts stores. 1. Set the portable air-conditioner about 5 feet in front of the casement window and make sure the electrical cord is long enough to reach the closest outlet. measure the width of the window installation kit and crank open the casement window so the kit can fit vertically in the window..
