As the hot summer sun starts to fade and the cooler temperatures of fall starts to settle in, residents of Wisconsin Rapids start preparing their homes and yards for the winter. For many, that leads to the question of whether they should cover their exterior air conditioning unit for the winter.

While it may seem like a good idea, the fact is there are multiple reasons why you shouldn’t cover your AC unit in the winter. On top of not being needed, covering your outdoor air conditioning equipment can even cause problems.

Here, the professionals at Rapids Sheet Metal Works Inc share five reasons why covering your air conditioning equipment doesn’t need to be on your fall to-do list and what you should do instead.

1. Your AC can Handle Snow

Outside AC units are supposed to withstand harsh weather conditions like snow in the wintertime. These units are built with solid materials and parts that can handle the outdoor elements without damage. The coils and fins of the unit are constructed to resist corrosion, and the housing is manufactured to protect the internal elements from moisture and debris.

2. Covered AC Systems may Encourage Mold Growth

One of the reasons you shouldn’t cover your air conditioner in the wintertime is because doing so can trap moisture—which is the opposite of what you want in your outdoor unit. That’s because allowing moisture to collect inside the unit produces the perfect conditions for mold and mildew to thrive.

Mold and mildew not only have an unpleasant smell, but they can also pose health risks, especially for individuals with respiratory issues or allergies. Additionally, the trapped moisture can corrode the internal components of the AC unit.

Instead of covering the unit, instead ensure proper drainage and keep the area around the unit clear of debris, allowing for efficient airflow and preventing moisture buildup.

3. A Covered Air Conditioner Can Host Animals

People aren’t the only ones who prepare for winter. Animals that live around your home are also searching for a warm, cozy place to crash for the wintry months. For many creatures, a covered air conditioner is an ideal winter dwelling.

Birds, mice, chipmunks and even rats often make winter dens inside covered air conditioners. Animals living in a covered AC unit can cause many problems. Rodents can chew through wires, insulation and other components, causing damage that may require pricey repairs. Debris animals bring into the AC to create a warm and comfortable nest can block airflow and ventilation, limiting the efficiency of the appliance and potentially causing it to overheat. Moreover, animal waste can result in unsanitary conditions and potent odors.

Leaving your air conditioner uncovered helps dissuade wildlife, because an uncovered AC gives them less shelter from cold weather than a covered unit. That’s better for your cooling system—and leaves you with less mess to clean up and things to repair when winter is over.

4. Covering Your Air Conditioner Restricts Airflow

Another reason it's better that you don't cover your AC unit in the winter is because a cover blocks airflow through the unit. Adequate airflow is vital for the AC system because it facilitates heat exchange and enables the unit to cool effectively. When airflow is constrained, the system has to work harder to reach the desired temperature, causing additional energy consumption and strain on the components.

In addition, if you use your air conditioning without knowing that the outside unit is covered or because you simply forgot, it could result in a range of problems. One issue is that the lack of appropriate airflow could cause the compressor to overheat, leading to its failure or damage.  That’s why it is essential to ensure the outdoor unit is free from obstructions and is not covered to maintain the best possible airflow.

5. AC Maintenance Is More Effective Than Covering Your Air Conditioner

The bottom line is, it's a whole lot more effective to do a little maintenance for your air conditioning unit than to cover your exterior AC unit.

There are a number of key maintenance projects you should prioritize to ensure optimal performance and longevity of your AC unit. First, it’s a good idea to check your outdoor AC unit regularly and remove any debris such as leaves, small branches and dirt to allow proper airflow. Second, check and clean the coils, fins and filters to make sure you don't see any dirt and dust buildup that would impede effective heat exchange or airflow.

Scheduled air conditioning maintenance not only enhances efficiency, but it also helps extend the unit's life span, decreases energy consumption and prevents costly repairs. Rather than using a cover, investing time and effort into routine air conditioning maintenance is a proactive plan of action that can greatly benefit your entire HVAC system in the long run.