Outdoor Air Conditioner Covers - PremierAcCovers - Winter - Tight Breathable Mesh Top Cover - 24X24- Gray PremierAcCovers provide top protection during winter with its tight breathable mesh and does not cause rusting of your ac unit. This cover is NOT waterproof. We also sell Premier waterproof tops. Highly resistant to sunlight, mold, mildew, and temperature extremes. 5 year manufacturer's waranty. 100 percent satisfaction guarantee