How to Mount Curtains on Aluminum Windows

Measure the width of the inside of your window opening.

Purchase a spring-loaded curtain rod, also known as a tension rod, at your local hardware or home improvement store. These rods come in a variety of sizes, so choose the one designated for the width of your window.

Thread your curtains onto the spring-loaded curtain rod.

Hold the rod up with the front side of the curtains facing you. Push the ends of the rod toward the center. The spring inside the rod will collapse the rod, making it shorter.

Place the rod into the window opening with the rod ends near the top of the window opening. Let go of the rod ends. The rod will try to return to its original length until the rod ends reach the side of the window openings. The pressure of the internal spring will keep the rod in place, holding up your curtains.