Windows and doors that hardly ever move tend to seize up. Hinges rust, frames swell slightly, locks stiffen, and rubber seals stick. The day you suddenly need that window open—for ventilation, cleaning, or smoke—it refuses to budge or makes alarming cracking sounds.
By opening and closing rarely used windows and doors once in a while, you keep the mechanisms alive. You can spot early issues: a bit of rust, a tight latch, a squeaky hinge. A drop of oil or a small adjustment now prevents full-on repairs later.
It’s similar to starting a parked car occasionally instead of leaving it dead for a year. Movement keeps things functional.