First of all, Wayfair will advertise a warranty plan with this item on their website that doesn’t even exist. DO NOT buy the warranty plan. They’ll sell it to you and then say GE has their own plan. Why offer a warranty plan that doesn’t exist? As far as the product goes, the window installation piece isn’t adjustable and if you have a window smaller than 20 inches, it won’t fit and you’ll have to cut it.