
Covering your outside AC unit can make a big difference in its performance and longevity.
By protecting it from debris and weather, you can extend its lifespan by up to 10 years, as seen in the "Impact of Debris on AC Unit" section.
Regular cleaning is no longer necessary, saving you time and effort.
This also reduces the risk of costly repairs, as mentioned in the "Common AC Unit Issues" section.
Is Covering AC Harmful?
Covering your air conditioner can have some not-so-great consequences. Trapping moisture inside and restricting airflow can lead to rust and corrosion.
Rust and corrosion can cause significant damage to your unit. I've seen it happen to neighbors who didn't know the risks.
Mold growth is another issue that can arise from covering your air conditioner. Moisture trapped inside can create an ideal environment for mold to thrive.
Covering your air conditioner can't give absolute protection, so it's essential to consider its disadvantages. Consulting a technician for proper fitting can help minimize these drawbacks.
Two main shortcomings of using an AC cover are worth noting.
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Factors Affecting AC Performance
Direct sunlight can significantly impact your air conditioner's performance, especially if it's not in use during the summer. The heat from the sun can reduce the effectiveness of the condenser coils.
Air conditioners are built to withstand different weather conditions, but extreme elements like heavy snowfall or intense afternoon sun can still cause damage. This is why using a cover is recommended to protect your unit in such situations.
If your AC unit is prone to collecting dust and debris, regular maintenance is crucial. A smart AC controller can be a convenient solution for this, and it can work with various types of heat pumps.
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AC Risks and Dangers
Covering your outside AC unit can have some serious risks and dangers if not done properly.
Covering the outdoor unit can trap moisture inside, leading to rust, corrosion, mold growth, and other damage to your unit.
If you live in an area with heavy rain and snow, moisture is bound to get in even when covered, making it crucial to choose a breathable cover with side vents.
Choosing the wrong cover can cause mold, mildew, rust, and corrosion to develop, so it's essential to consult an air conditioner installation technician for proper fitting and the right cover.
Covering your AC unit can also be a problem if it also functions as a heat pump for your home, which can cause damage if not checked before covering.
If your AC unit turns on while covered, the copper coils inside won't cool down, leading to hot air being pushed back into your home and your air conditioner running for too long, overheat, and break down.
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Risks of Choosing an AC
Choosing an air conditioner cover may not provide absolute protection, and it's essential to consider the drawbacks. Covering your air conditioner can be a good idea in some cases, but it's not a foolproof solution.
Consulting an air conditioner installation technician can help minimize the risks associated with using an AC cover. This professional can assist in purchasing the right cover and ensure a proper fit.
Using an AC cover can lead to two main shortcomings: it may not provide the level of protection you need, and improper installation can cause more harm than good.
Mold and Mildew
Mold and mildew growth is a common issue that can arise when covering your air conditioner. Moisture can still find its way into the unit, even when covered, and can cause mold infestation and accelerate corrosion.
Using a non-breathable cover can trap moisture inside the unit, leading to mold growth, mildew, rust, and corrosion. This is a major concern, especially in areas with heavy rain and snow.
Choosing a breathable cover with side vents allows for proper ventilation and airflow, which helps prevent moisture buildup. This is a crucial factor in maintaining the performance and integrity of your AC.
Mold and mildew growth can hinder the HVAC system's airflow and impair the condenser's performance. This can lead to a range of problems, including reduced efficiency and potentially even complete system failure.
A breathable cover can help prevent moisture accumulation, but it's still essential to ensure proper ventilation and airflow. This can be achieved by using a mesh air conditioner cover that allows all necessary airflow while still protecting the unit from debris.
If you live in an area with high humidity, it's even more crucial to use a breathable cover to prevent mold and mildew growth. This will help maintain the performance and integrity of your AC, and prevent costly repairs down the line.
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Pest Infiltration
Pest infiltration is a real issue with AC units. Birds may build their nests inside the unit, causing costly repairs.
Mice can chew through wires and make their own nest, which is a nightmare to deal with. This can happen if you don't cover the unit during seasons with heavy debris and dirt.
Covering the unit during fall can help prevent these problems. However, you can also schedule maintenance with your technician to remove dust and cover the unit.
Using a cover that's designed to withstand weather and pests is crucial. The type of material and design can make a big difference in preventing damage.
If you live in an area with heavy storms during winter, covering the entire unit might be necessary. Otherwise, covering just the top might be sufficient.
Dangers Faced by Conditioner
Covering your air conditioner can be detrimental if not done correctly. It can trap moisture inside and restrict airflow, leading to rust, corrosion, mold growth, and other damage to your unit.

Using a non-breathable cover can cause the development of mold, mildew, rust, and corrosion. This is especially true in areas with heavy rain and snow.
Choosing a breathable cover with side vents allows for proper ventilation and airflow, preventing moisture buildup. However, this is only effective if the cover is designed to allow airflow.
If your air conditioner also functions as a heat pump, covering it can cause damage. This is because the unit will continue to run and heat up, potentially leading to a breakdown.
Leaving your air conditioner on while covered can cause the copper coils to overheat, leading to a breakdown. Shutting off your air conditioner when it's covered is a simple solution to this problem.
Pests and rodents can infiltrate your air conditioner if it's covered, especially during the fall and winter months. This can lead to costly repairs and damage to your unit.
Covering only the top of your air conditioner might be sufficient if you live in an area with mild winters. However, this may not provide enough protection against heavy storms.
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Using a mesh air conditioner cover can allow for airflow while still protecting your unit from debris and pests. This type of cover is ideal for areas with heavy tree coverage or frequent storms.
In areas with severe hailstorms, an armor top cover may be the best option. These covers have armor plates sewn into the top to protect against hail damage.
Top air conditioner covers may not provide as much protection, but they can still be beneficial during the spring and summer months. However, full AC covers are recommended for the fall and winter months to avoid damage from debris and pests.
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Why Cover Your AC?
Covering your AC can make a big difference in its lifespan and efficiency. You can save up to $32.76 per month by keeping your AC unit clean and running efficiently.
Using a cover can protect your AC from debris falling from gutters or trees, such as acorns, twigs, and leaves. A mesh cover allows for proper airflow, so you can leave it on while the unit is running.
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A mesh cover also protects your AC from the sun, which can make its job of cooling your house easier. This is beneficial for two reasons - your AC will remain looking like new and it will keep the unit cooler.
In areas prone to hailstorms, an Armor Top Cover may work best. These covers have four armor plates sewn into the top to protect from ice.
Covering your AC can also prolong its overall lifespan, saving you thousands of dollars. This is a big deal, especially when you consider that yearly air conditioner tune-ups and keeping it covered during inclement weather can save you up to $1,000 per year.
Covering AC Options
You can choose from a few options when it comes to covering your outside AC unit. One popular choice is a breathable and water-resistant cover, which can protect your unit from harsh weather conditions.
Breathability is key, so look for a cover made of a commercial-grade vinyl or high-quality polyester. Avoid plastic covers that can trap moisture and cause mold and mildew.
What to Consider When Buying a Cover
Consider the climate you live in and the conditions your air conditioner will face. Harsh winters, hailstorms, and trees and bushes nearby can all impact your cover's performance.
Look for a cover made of breathable materials, such as commercial-grade vinyl or high-quality polyester. This will help prevent trapped moisture from causing mold, mildew, rust, and corrosion.
Mesh vents are a must if you're covering your entire unit, as they allow air to circulate and moisture to evaporate. Without them, you're risking damage to your AC.
Measure your air conditioner carefully to ensure the cover fits correctly. An ill-fitting cover won't work as well and could let small rodents and insects in.
You can opt for a cover that's a bit larger than needed, but make sure it has a drawcord, elastic hem, and/or buckle straps to secure it in place.
Cover Alternatives
If you're in a pinch and can't get a cover, you can use plywood to protect your air conditioner from hail or blizzard damage.
You'll need to place the plywood on top of the unit and weigh it down with bricks or rocks to keep it in place. Plywood is breathable, so it won't cause mold or mildew inside the unit.
As soon as the storm is over, simply brush off the snow and ice and remove the plywood. This makeshift solution can be used in conjunction with a cover for extra protection.
If you're looking for a more decorative solution, consider building or buying an air conditioner screen. These screens will help block debris from the wind and can be paired with a top AC cover for a stylish protection solution.
Benefits of Covering AC
Covering your air conditioner can save you a significant amount of money on your electric bill. By keeping your AC unit clean and running efficiently, you can save up to $32.76 per month, which translates to a whopping $1,000 per year.
Using a cover will also prolong your unit's overall lifespan, saving you thousands of dollars in the long run. A simple, breathable cover made from plywood can be constructed to fit the top of the AC unit, allowing for continued airflow and protecting against damage from debris.
This type of cover is a great solution for protecting your air conditioner from limbs and other debris that may fall onto the outdoor unit during winter storms.
Protect Your Conditioner Safely This Winter
A simple, breathable cover can be constructed using just plywood to protect your air conditioner from damage caused by limbs and other debris that may fall onto the outdoor unit in a winter storm. Cut a sheet of plywood to fit the top of the AC unit only and secure it to the top of the unit for the cold winter months.
This type of cover allows for continued airflow in and out of the unit over winter so moisture doesn’t build up inside. You can remove it before summer comes and you need to run the air conditioning system again.
Using plywood to cover your air conditioner is a better solution than using commercial covers, which can trap moisture and cause mold and mildew to develop. Plywood is breathable enough to avoid these issues.
If you're short on time, you can also place plywood on top of the unit and weigh it down with bricks or rocks to keep it in place. This will protect your air conditioner from hailstorms or blizzards until you can get a proper cover.
Remember to brush off the snow and ice and remove the plywood as soon as the storm is over to ensure your air conditioner continues to function properly.
Conditioner Cost Savings
Covering your air conditioner can lead to significant cost savings. According to the Louisiana Cooperative Extension Service at LSU, you can save an average of $32.76 per month by keeping your AC unit clean and running efficiently.
Using a cover can also prolong your unit's lifespan, saving you thousands of dollars in the long run. By getting yearly air conditioner tune-ups and keeping it covered during inclement weather, you could save up to $1,000 per year.
Efficient air conditioners save money on electric bills, yearly maintenance, one-off repairs, and full replacement.
Frequently Asked Questions
Can we cover an AC outdoor unit when not in use?
No, covering an outdoor AC unit is not recommended as it can trap moisture and provide a shelter for pests, potentially damaging the unit
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