Check the listing for details. Indoor Window Double Insulation AC Covers by ALPINE HARDWARE (21" x 13" x 3.5"). Condition: New. Listed at 13.67 USD. Indoor Window AC Covers by ALPINE HARDWARE - Double Insulation Air Conditioner Cover (White, 21" x 13" x 3.5") Alpine Hardware offers an indoor window air conditioner cover. Construction: Alpine Hardware's indoor window ac cover is made of a white polyester with elastic edges that are pvc-lined to make sure the fit is tight and snug. Features: -Reduces heating costs in the winter significantly. -Protects the inside of the air conditioner from debris. -Protects from winds and drafts outside, so they don't come inside. -Works with any name brand window air conditioning unit. Available Sizes -16"long x 13"high x 3.5"deep. -21"long x 13"high x 3.5"deep. -25"long x 16"high x 3.5"deep. -28"long x 20"high x 3.5"deep. QUALITY GUARANTEE: Alpine Hardware is backed by a 5-year warranty. Alpine Hardware gives a 100% satisfaction guarantee if you are unsatisfied for any reason. You may also check Our Other Items Procedure: You will be notified on the day that your goods have been dispatched via e-mail. Once you receive your goods, please inspect them for any damage during transit, and report the said damage within 24hrs via e-mail. If all is well please leave feedback, so we are aware that you have received your goods. Please note that if there are any problems, contact us first via e-mail giving full details of any problem along with your user ID Warranty: After receiving the item, you have 30 days to contact us about a factory defect or if something was damaged during shipping. You will have the option if something is damaged or has a factory defect to get a replacement or your money back. If the item doesn't work for your intended use, you have 7 days from when you received the item to get a refund. The item must be returned unharmed and return shipping is paid by the buyer. Please contact us before returning as we need to know you are returning the item.