Thermwell Prods. Co. AC11H Quilted Indoor Air Conditioner Cover by Thermwell Prods. Co.. $17.13. 2 piece plastic and fabric cover. Plastic liner stops drafts and keeps dust and dirt out. Use installation tape (included) to secure plastic liner to interior window air conditioner unit. Quilted fabric cover fits over plastic liner and adds a finished decorative look. Color: Beige.