Air Conditioner Covers - Outdoor Winter Breathable Top Cover - 32x32 - Black PremierAcCovers provide top protection during winter with its tight breathable mesh and does not cause rusting of your ac unit. This top cover is NOT waterproof. We also sell Premier waterproof covers. Highly resistant to sunlight, mold, mildew, and temperature extremes. Full 5 year manufacturer's waranty. 100 percent satisfaction guarantee.