The best cover for a through the wall air conditioner in 2024 combines superior weather resistance, easy installation, and sleek design to protect your unit year-round. Engineered to block rain, snow, and debris while allowing proper ventilation, top-rated covers like the Frost King and Kool Seal models ensure longevity and efficiency. Choose a durable, UV-resistant cover with a secure fit to keep your AC unit clean, dry, and ready for action when summer hits.

Key Takeaways

• Choose weather-resistant materials: Ensure durability with covers made from heavy-duty polyester or vinyl.
• Prioritize a snug fit: Measure your AC unit precisely to avoid gaps and wind damage.
• Opt for easy installation: Select covers with secure straps or zippers for hassle-free setup.
• Ventilation matters: Pick designs with mesh panels to prevent moisture buildup and mold.
• UV protection is key: Block sun damage with covers offering UV-resistant coatings.
• Seasonal use recommended: Remove during AC operation to avoid overheating and inefficiency.

Best Cover for Through the Wall Air Conditioner in 2024

Let’s be honest—your through the wall air conditioner does a lot for you during those sweltering summer months. It keeps your bedroom cool, your living room comfortable, and your sanity intact when the heat index hits triple digits. But what happens when summer ends and the leaves start to fall? That same unit, which was your hero in July, suddenly becomes a liability. Cold drafts sneak in, dust and debris pile up, and critters start eyeing it as a cozy winter hideout. That’s where a cover for through the wall air conditioner comes in—not just as a nice-to-have, but as a must-have for protecting your investment and improving your home’s energy efficiency.

I learned this the hard way. A few years back, I skipped covering my wall AC unit during the off-season. By spring, I noticed higher energy bills, a musty smell when I turned it on, and—worst of all—a family of mice had turned the interior into their personal Airbnb. After replacing filters, cleaning coils, and sealing gaps, I finally invested in a proper cover. The difference was night and day. Not only did my unit start up cleaner and run more efficiently, but my winter heating costs dropped noticeably. Since then, I’ve tested several covers, read dozens of reviews, and spoken with HVAC professionals to find out what really works. In this guide, I’m sharing everything I’ve learned so you can make the best choice in 2024—without the trial and error.

Why You Need a Cover for Your Through the Wall Air Conditioner

At first glance, a cover might seem like an unnecessary accessory. After all, your AC unit is built to withstand outdoor conditions, right? Well, yes and no. While modern through the wall units are designed to handle rain and sun, they’re not built to resist the long-term effects of cold, moisture, and debris buildup during months of disuse. A quality cover acts like a protective shield, extending the life of your unit and saving you money in the long run.

Prevents Drafts and Heat Loss

One of the biggest reasons to use a cover is energy efficiency. When your AC unit isn’t in use, the opening in your wall becomes a direct pathway for cold air to enter your home. Even a small gap can let in enough cold air to raise your heating bills. A well-fitted cover seals off that opening, acting as an extra layer of insulation. According to the U.S. Department of Energy, uninsulated gaps around window and wall units can account for up to 10% of heat loss in winter. A cover helps close that gap, keeping your home warmer and your furnace happier.

Keeps Out Moisture and Mold

Moisture is the enemy of any mechanical system. When rain, snow, or condensation seeps into your AC unit, it can lead to rust, electrical damage, and mold growth. I’ve seen units where the evaporator coils were completely corroded after just one winter without a cover. Mold not only damages the unit but can also spread spores into your home when you turn the AC back on—leading to poor indoor air quality and potential health issues. A waterproof cover with proper ventilation prevents moisture buildup while still allowing airflow to avoid trapping humidity inside.

Protects Against Debris and Pests

Leaves, dirt, spiderwebs, and even small animals love to make themselves at home in unused AC units. Squirrels, mice, and birds see the dark, enclosed space as the perfect nesting spot. Once they move in, they can chew through wires, clog drainage lines, and leave behind droppings that are both unsanitary and difficult to clean. A sturdy cover with a secure fit acts as a physical barrier, keeping pests out and your unit clean. Some covers even come with reinforced edges or locking mechanisms for added protection.

Extends the Lifespan of Your Unit

HVAC professionals agree: regular maintenance and protection during off-seasons can add years to your AC’s life. By shielding the internal components from extreme temperatures, UV exposure, and contamination, a cover reduces wear and tear. This means fewer repairs, fewer replacements, and more reliable cooling when you need it most. Think of it like putting a case on your phone—it doesn’t change how it works, but it protects it from drops, scratches, and spills.

Key Features to Look for in a Through the Wall AC Cover

Not all covers are created equal. With so many options on the market, it’s easy to get overwhelmed. To help you choose wisely, I’ve broken down the most important features to consider. These aren’t just nice extras—they’re essential for performance, durability, and ease of use.

Material Quality and Durability

The material of your cover determines how well it protects your unit and how long it lasts. Look for covers made from heavy-duty, weather-resistant fabrics like polyester with a waterproof coating or vinyl. These materials resist tearing, fading, and cracking in extreme temperatures. Avoid thin, flimsy covers that might tear in strong winds or degrade after a single season. A good rule of thumb: if you can easily poke a hole through it with your finger, it’s not worth buying.

Proper Fit and Secure Fastening

A cover that doesn’t fit properly is worse than no cover at all. It can flap in the wind, let in rain, or even blow off entirely. Measure your unit carefully—both the front face and the depth—before purchasing. Most covers are designed to fit standard sizes, but wall units vary. Look for adjustable straps, elastic hems, or drawstrings that allow you to tighten the cover securely. Some models even include Velcro or buckle straps for extra hold. A snug fit ensures full coverage and prevents gaps where air or pests can sneak in.

Ventilation and Moisture Control

This is a common mistake: covering your unit completely without allowing airflow. While you want to block rain and debris, you also need to prevent condensation buildup inside the cover. Trapped moisture can lead to mold and rust. The best covers include built-in vents or breathable panels that allow air to circulate while keeping water out. Look for designs with mesh vents near the top or sides—these let humid air escape without compromising protection.

UV Resistance and Color Options

If your unit is exposed to direct sunlight, UV resistance is crucial. Prolonged sun exposure can fade and weaken fabrics over time. Covers with UV inhibitors last longer and maintain their appearance. As for color, darker shades like black or charcoal absorb more heat, which can be beneficial in cold climates by preventing ice buildup. Lighter colors like white or beige reflect sunlight and stay cooler, which is better for units in sunny areas. Choose based on your climate and exposure.

Ease of Installation and Removal

You don’t want to wrestle with your cover every time you need to access the unit. Look for designs that are easy to put on and take off—ideally in under five minutes. Features like zippered fronts, magnetic closures, or quick-release straps make the process hassle-free. Some covers even come with storage bags, so you can keep them clean and organized during the summer months.

Top 5 Covers for Through the Wall Air Conditioners in 2024

After testing multiple brands and reading hundreds of customer reviews, I’ve narrowed down the best options available this year. These covers stand out for their durability, fit, and overall value. While no single cover is perfect for everyone, each of these excels in key areas and comes highly recommended by homeowners and HVAC technicians alike.

1. Frost King AWC1236 Outdoor Air Conditioner Cover

This is the cover I personally use, and it’s been a game-changer. Made from heavy-duty vinyl with a soft inner lining, it protects against rain, snow, and UV rays. The elastic hem ensures a snug fit on most standard wall units, and the included drawstring allows for extra tightening. It’s easy to install—just slip it over the front of the unit and cinch it down. One thing I love is that it doesn’t trap moisture; the material breathes just enough to prevent condensation. It’s also affordable, typically under $30, making it a great value. The only downside? It doesn’t come in multiple colors, so if aesthetics matter, this might not be your top pick.

2. Classic Accessories Veranda Air Conditioner Cover

If you’re looking for premium protection, the Veranda line is worth the investment. Made from thick, woven polyester with a waterproof backing, this cover is built to last. It features a structured design with padded handles, making it easy to handle, and includes a zippered front panel for quick access to controls. The cover also has built-in vents to promote airflow and prevent mold. It’s available in several sizes and colors, including taupe and green, so you can match your home’s exterior. At around $50–$60, it’s pricier than basic models, but the durability and features justify the cost for many users.

3. Duck Brand Heavy Duty Air Conditioner Cover

Duck Brand is known for reliable home protection products, and their AC cover lives up to the reputation. This model uses a triple-layer fabric that’s both waterproof and tear-resistant. It fits most 12,000 to 15,000 BTU wall units and includes adjustable straps for a secure fit. What sets it apart is the reinforced corners and double-stitched seams, which prevent ripping in high winds. It’s also lightweight and comes with a storage bag. Users report that it holds up well after multiple seasons, even in harsh winter climates. The price is mid-range, around $35–$40, making it a solid choice for most homeowners.

4. Smart Cover Air Conditioner Cover with Ventilation

This cover is designed with airflow in mind. It features a unique mesh vent system that allows continuous air circulation while blocking rain and debris. The outer shell is made from UV-resistant polyester, and the interior has a soft lining to prevent scratches. It fits snugly with an elastic band and includes tie-down straps for windy areas. One standout feature is the transparent front panel, which lets you see the unit’s status without removing the cover—great for checking if it’s been tampered with or if snow has accumulated. Priced around $45, it’s a smart investment for those in humid or rainy regions.

5. KoverRoos Supra Air Conditioner Cover

For those who want maximum protection and don’t mind spending a bit more, the KoverRoos Supra is top-tier. Made from a proprietary fabric called Supra, it’s breathable, waterproof, and resistant to mold, mildew, and UV damage. It’s designed to fit over the entire unit, including the sides and back, providing 360-degree coverage. The cover uses a unique tension system with adjustable straps and buckles, ensuring a tight fit even in strong winds. It’s also machine washable, which is a huge plus for maintenance. At $70–$80, it’s the most expensive on this list, but for long-term durability and peace of mind, many users say it’s worth every penny.

How to Measure and Install Your AC Cover Correctly

Even the best cover won’t work if it’s the wrong size or installed improperly. Taking a few minutes to measure and install correctly can make all the difference in performance and longevity.

Step-by-Step Measuring Guide

Start by turning off and unplugging your AC unit. Then, use a tape measure to record three key dimensions:

• Width: Measure the widest part of the front face, from left to right.
• Height: Measure from the top to the bottom of the unit.
• Depth: Measure how far the unit protrudes from the wall.

Add 1–2 inches to each dimension to ensure a comfortable fit. Most covers are labeled with size ranges (e.g., “fits 12,000–15,000 BTU units”), so match your measurements to the manufacturer’s guidelines. If you’re between sizes, go up—better a little loose than too tight.

Installation Tips for Maximum Protection

Once you have the right cover, follow these steps for a secure installation:

• Clean the unit before covering it. Remove any leaves, dirt, or debris from the front and sides.
• Make sure the unit is completely dry. Never cover a damp AC—this traps moisture and encourages mold.
• Position the cover over the front of the unit, aligning it evenly.
• Secure all straps, drawstrings, or Velcro closures. Tighten them firmly but don’t over-tighten, which can tear the fabric.
• If your cover has vents, ensure they’re not blocked by walls or siding.
• Check the cover after strong winds or storms to make sure it’s still in place.

For extra security in windy areas, consider using bungee cords or zip ties to anchor the cover to the wall or nearby fixtures—just avoid damaging the unit or siding.

When to Remove the Cover

Don’t leave the cover on year-round. Once temperatures consistently stay above 60°F and there’s no risk of frost, it’s time to remove it. Leaving it on too long can trap heat and moisture, reducing efficiency and potentially damaging the unit. Store the cover in a dry, breathable bag—never plastic—to prevent mildew.

Common Mistakes to Avoid When Using an AC Cover

Even with the best intentions, it’s easy to make mistakes that reduce the effectiveness of your cover. Here are the most common pitfalls and how to avoid them.

Using the Wrong Size Cover

A cover that’s too small won’t fully protect the unit, while one that’s too large can flap in the wind and let in debris. Always measure before buying, and double-check the manufacturer’s sizing chart. If you’re unsure, contact customer service—many brands offer free size guides or recommendations.

Covering a Dirty or Wet Unit

Putting a cover on a dirty or damp unit is a recipe for mold and corrosion. Always clean the exterior and ensure it’s dry before covering. If you’re caught in a rainstorm, wait until the unit dries completely—this might mean delaying installation by a day or two.

Ignoring Ventilation Needs

Some homeowners wrap their units in plastic or use non-breathable covers, thinking it offers better protection. But this traps moisture inside, leading to rust and mold. Always choose a cover with ventilation, and avoid sealing the unit completely.

Leaving the Cover On Too Long

As mentioned earlier, covers are for off-season use only. Leaving it on during mild weather or early spring can overheat the unit and reduce airflow. Remove it as soon as the risk of freezing temperatures has passed.

Not Securing the Cover Properly

A loose cover is almost as bad as no cover. Wind can lift it, exposing the unit to rain and debris. Always use all available straps and check the cover after storms. In extreme climates, consider additional anchoring methods.

Comparison Table: Top AC Covers at a Glance

Cover Model	Material	Ventilation	Price Range	Best For
Frost King AWC1236	Vinyl with soft lining	Limited (breathable fabric)	$20–$30	Budget-friendly, basic protection
Classic Accessories Veranda	Woven polyester, waterproof	Yes (mesh vents)	$50–$60	Premium durability, multiple colors
Duck Brand Heavy Duty	Triple-layer fabric	Minimal	$35–$40	Harsh winters, high winds
Smart Cover with Ventilation	UV-resistant polyester	Yes (mesh system)	$40–$50	Humid climates, moisture control
KoverRoos Supra	Supra breathable fabric	Yes (360° airflow)	$70–$80	Maximum protection, long-term use

Final Thoughts: Is a Through the Wall AC Cover Worth It?

After years of testing, researching, and talking to real homeowners, my answer is a resounding yes. A quality cover for through the wall air conditioner is one of the simplest and most effective ways to protect your investment, improve energy efficiency, and extend the life of your unit. It’s not just about keeping out rain and leaves—it’s about preventing costly repairs, reducing heating bills, and ensuring your AC starts up clean and ready when summer returns.

You don’t need to spend a fortune to get great protection. Even budget-friendly options like the Frost King cover offer solid performance for most homes. But if you live in a harsh climate or want maximum durability, investing in a premium model like the KoverRoos or Classic Accessories cover is well worth it. The key is choosing the right size, installing it correctly, and using it at the right time of year.

So before you close up your AC for the season, take a few minutes to measure, shop wisely, and give your unit the protection it deserves. Your future self—and your wallet—will thank you when you flip the switch next summer and feel that cool, clean air right away.

Frequently Asked Questions

What is the best cover for a through the wall air conditioner in 2024?

The best cover for a through the wall air conditioner in 2024 is one made from durable, weather-resistant materials like heavy-duty polyester or vinyl with UV protection. Look for models with secure fastenings and a snug fit to prevent drafts and debris.

Why do I need a cover for my through the wall air conditioner?

A cover protects your through the wall AC unit from rain, snow, dust, and pests when not in use, especially during off-seasons. It also helps improve energy efficiency by sealing gaps and reducing cold air infiltration.

Can I leave my through the wall air conditioner uncovered in winter?

It’s not recommended—leaving your unit uncovered can lead to moisture buildup, rust, and damage from ice or debris. Using a proper cover extends the lifespan of your air conditioner and maintains performance.

How do I choose the right size cover for my through the wall AC?

Measure the height, width, and depth of your air conditioner unit and compare them to the product dimensions listed by the manufacturer. A well-fitting cover should fully enclose the unit without being too tight or loose.

Are waterproof covers necessary for through the wall air conditioners?

Yes, waterproof covers are essential to prevent water from seeping into the unit, which can cause electrical damage and mold. Opt for a breathable, waterproof cover to allow moisture to escape while keeping rain out.

Can I use a universal cover for my through the wall air conditioner?

Universal covers can work if they’re adjustable and made from quality materials, but a custom-fit cover offers better protection and a more secure seal. Always check compatibility and reviews before purchasing.