Casement Windows are still one of the most popular replacement window choices. Casement Windows have a hinge on the side allowing the window to swing all the way open for maximum ventilation. This is unlike double hung or sliding windows that typically can only open halfway. Casement Windows are opened and closed with a crank handle. A few possibly negative things to consider about Casement Windows include having a fully exposed screen from the inside, having your window subjected to the elements when it is fully swung open, and potential problems with working mechanical parts.