Use this window air conditioner cover to protect your air conditioner from dust and moisture during the offseason. Heavy 4gauge vinyl outdoor cover helps conserve energy by keeping drafts from entering the house. Adjustable nylon cords included. Large 27" long x 27" wide x 21" high. Medium 28" long x 21" wide x 21" high. Small 18" long x 20" wide x 20" high.