Q&A for How to Open a Stuck Window

Spray the lock with WD-40 or similar product and let it sit for 24 hours. You could also see if the lock is attached to the window or frame and unscrew or otherwise remove the entire lock.

You could, of course, but you would have to replace the entire window, and you're risking an injury and/or property damage.

Follow the steps in the article. If nothing works, call a professional to fix it.

Probably not a lock. Check to make sure there isn't something in the channel, or that its screwed shut. Your window may have two thumb latches on top, and one at the bottom that has to be lifted slightly like a car door before it will open. Sometimes offices and hotels will install a metal clamp to keep the Windows from opening, but these are usually visible.

Anything that is long and metal should be able to do the job. Try a screwdriver.

Make sure there is nothing in the rail, or that it's not screwed open. Then lubricate the entire channel. Lift the window slightly and make sure it's straight in the frame before carefully closing it.

Remove the nail or staple, then refasten the frame using a small screw that doesn't restrict the rail. Lubricate the entire rail and channel afterward.