. from settling on your air conditioner coil. Covering your air conditioner for the winter will keep off whatever dust and pollutants accumulate along with your snow. Just remember...Air Design, Valley Stream NY 516-825-5066 home about us products finance calculator clean water testimonials contact us Frequently Asked Questions How often should I get my... equipment to operate at its most efficient, as it was designed to do. Do I need to cover my outside air conditioning unit in the winter? It s always a good idea to keep dirt, leaves, etc...