Type of Unit

• If the unit is a heat pump, which means it is a cooling and heating unit, you should not cover the unit. The central air system must remain uncovered all the time, even during the winter, because it remains in use during the winter to heat the home. If the unit isn't a heat pump, you can use a cover to prolong the life of the unit, but it must be done correctly.
  
  

Covering the Unit

• Covering the condenser the correct way provides protection from the elements, but the unit must be able to breathe so that the moisture can escape. If the cover is airtight or placed around the unit too tightly, the moisture won't be able to escape and can cause the unit to rust. Use a cover that fits the top and hangs down the sides but doesn't cover the coils completely. The size of the cover depends on the size of your unit.
  
  

Benefits of Using a Cover

• Using a cover to protect the central air conditioner prevents debris such as leaves and dirt from getting into the condenser coils and fan. This can prolong the life of the unit and make it easier to clean it in the spring before you turn it on for the season. Clean condenser coils and fans enable the unit to operate more efficiently and cost less to run than a dirty one.
  
  

Before Start-Up

• After winter, you should remove the cover and inspect the central air-conditioning unit for debris or dirt on the condenser coils, which would be minimal if you use a cover. If you do not use a cover, you must clean the dirt and debris from the coils, or the effectiveness of the unit is decreased.