PremierAcCovers Matching Gray Air Conditioner Cover - Summer/All-Season Full Cover 28x28x28 Provides full protection from leaves, grass and debris buildup in your ac unit. PremierAcCovers Summer/Allseason full covers are made of heavy duty long lasting, open mesh material. Our summer/Allseason Air Conditioner Covers may be left on while the unit is running. Full 5 year manufacturer's warranty. 100 percent satisfaction guarantee