How To Protect Your AC Unit From Rain

May 19, 2025

Rain is inevitable in the Pacific Northwest, but that doesn’t mean your AC is immune to damage. While most units can handle normal rainfall, heavy storms, pooling water, and flooding can take a toll on your system.

Knowing how to protect your AC unit from rain can help extend its lifespan and prevent expensive repairs. And if rain damage does occur, our professionals can get your system back on track. At Blue Flame Heating, Air & Electric, we provide expert air conditioning services, including AC repair, energy-efficient installations, and maintenance to keep your unit running smoothly no matter what the weather throws your way. Call 206-388-5667 or schedule service online today!

Can Rain Damage an AC Unit?

While AC systems are designed to withstand normal rainfall, excessive moisture can cause problems over time. Knowing how to protect an AC outdoor unit from rain can help prevent damage caused by:

Flooding: Standing water can damage electrical components.
Storm debris: Leaves, branches, and dirt can clog the system.
Corrosion: Prolonged moisture exposure can rust internal parts.

Regular AC maintenance and repairs help catch early signs of water damage, ensuring your AC runs efficiently and lasts longer. Professional tune-ups can also help identify other potential issues before they become expensive repairs.

With Blue Flame, you can enroll in one of our Pro Service Plans to effortlessly schedule routine maintenance, provide priority services, and give you more savings when repairs are necessary.

How To Protect Your Outdoor AC Unit From Rain

Want to learn how to protect an AC compressor from rain? Here are our top four tips for protecting your outdoor AC unit.

1. Inspect & Clear the Area Around the Unit

Keeping the space around your AC unit clear helps prevent rain-related damage. Trim back shrubs, remove leaves, and clear away debris that could block airflow or get inside the system. Regular inspections ensure nothing restricts the unit, reducing the risk of clogs, corrosion, or unnecessary wear over time.

2. Elevate the Unit (in a Flood-Prone Area)

Heavy rain can lead to flooding and water damage if your AC unit sits in a low-lying area. Installing the unit on a raised platform or concrete pad helps keep it above standing water. This simple step protects electrical components and prevents long-term issues caused by excess moisture.

3. When and How to Cover the AC Unit

Covering your AC unit can help during extreme storms, but improper coverage can do more harm than good. Never use plastic wraps or tarps, which trap moisture and cause corrosion. Instead, secure a breathable, manufacturer-approved cover with plywood for protection from debris and high winds. Always remove covers promptly to prevent moisture buildup.

4. Secure Electrical Components

Water and electricity don’t mix, so protecting your AC’s electrical components is important. Check for frayed or damaged wires and ensure all connections are secure. A surge protector can help safeguard the system from lightning strikes. If you’re unsure about your system’s safety, a professional inspection is the best option—contact us today.

How to Protect a Window AC From Rain

Dealing with a window AC? No problem. Learn how to protect a window AC from rain in three easy steps.

1. Seal the Edges

A properly sealed window AC unit helps prevent leaks and humidity buildup. Ensure a tight fit by checking for gaps around the edges where rain could seep inside. Adding insulation or weather stripping can improve the seal, keeping moisture and humidity out and helping your unit run more efficiently.

2. Use a Cover (Carefully)

A breathable fabric cover can help protect your window AC from debris, but avoid anything that traps moisture, which can lead to rust and mold. If possible, remove and store the unit indoors during heavy storms or winter to prevent long-term weather damage.

3. Check for Water Damage After Rain

After heavy rain, inspect your window AC for signs of water damage. Look for rust, mold, or water pooling inside the unit, which can lead to performance issues. If you notice any problems, schedule service online or call 206-388-5667 for professional assistance.

What Materials Should Be Used to Cover an AC Unit?

Choosing the right materials is key to preventing damage when covering your AC unit. The wrong cover can trap moisture, leading to rust, mold, and corrosion. Here are the best options for protection:

Breathable, weather-resistant materials: Manufacturer-approved covers allow airflow while keeping debris out.
Plywood: A sturdy option for shielding the unit during major storms. Secure it properly to prevent wind damage.
Avoid plastic tarps: These trap moisture, creating the perfect environment for rust and mold to develop inside the unit.

For custom solutions or additional protection, it’s best to get professional advice—contact us to find the best option for your AC.

When Should You Call a Professional?

While routine maintenance can help protect your AC, some situations require expert attention. If your unit has been exposed to severe weather or isn’t working as it should, it’s time to call a professional. Signs you may need service include:

After heavy storms or flooding: Water damage can affect electrical components and overall performance.
Unusual sounds: Grinding, buzzing, or rattling noises may indicate internal damage.
Reduced cooling efficiency: If your AC isn’t keeping your home as cool as usual, there could be underlying issues.
Visible corrosion: Rust on components can lead to long-term damage if not addressed.
Visible damage: Dents, bent fins, or broken parts can impact efficiency and lead to further issues.

If your AC is already showing signs of trouble, our team is ready to help. Schedule an AC repair service today to get your system back on track.

Blue Flame is Here to Help

AC units are built to handle the elements, but proactive protection is the best way to avoid costly repairs. From heavy storms to long-term wear, knowing how to protect an AC unit from rain and taking the right precautions can keep your system running efficiently for years to come.

At Blue Flame, our certified HVAC professionals provide expert inspections, repairs, and maintenance to keep your AC in top condition. If your unit has been through severe weather or just needs a routine checkup, we’re ready to help. Plus, check out our special offers for more savings on essential services.

For reliable AC services, call 206-388-5667 today. Our experts are here to keep your system running smoothly, no matter the weather.