Best Ways: How To Store Window Air Conditioner Properly

Knowing how to store window air conditioner units is important for keeping them working well season after season. The best way to store air conditioner units is to clean them very well, drain out any water, let them dry completely, wrap or cover window AC unit components, and put them in a safe, dry place like a garage or basement for winter storage air conditioner protection. This keeps the unit safe and prevents rust on AC unit parts, protecting AC during off-season months.

When summer ends, your window air conditioner unit has worked hard. It kept your home cool and comfortable through hot days and warm nights. Now, it’s time to think about putting it away for the colder months. Simply pulling it out of the window and sticking it in a corner is not the best plan. Proper winter storage air conditioner care makes a big difference. It helps your unit last longer. It also makes sure it works right when you need it again next year. Think of it like putting away your summer clothes. You wash them first, right? You don’t just shove sweaty shirts into a box. Your AC needs care too.

This guide will walk you through the steps for the best way to store air conditioner units. We will talk about cleaning, drying, wrapping, and finding the right spot. Follow these AC storage tips. You will keep your unit in great shape. This protects your investment and saves you money in the long run.

How To Store Window Air Conditioner
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Getting Ready to Store Your AC Unit

Before you even touch your AC unit, you need to get a few things ready. This will make the job easier and safer. Have your tools and cleaning stuff ready before you start. This saves trips back and forth.

Tools and Supplies You Will Need

You don’t need many fancy things. Most items you might already have around your house.

Gloves: To protect your hands from dirt and sharp edges.
Screwdriver: You might need this to take off panels or parts for cleaning.
Vacuum cleaner with brush tool: Good for getting dust out of fins and coils.
Soft brushes: Like an old toothbrush or a special fin comb.
Spray bottle: For cleaning solutions.
Mild soap or detergent: Like dish soap.
Water: To mix with soap and rinse.
Clean rags or towels: Many of them. You will need them for cleaning and drying.
Bucket: To hold water or cleaning solution.
Rust inhibitor spray (optional but helpful): To prevent rust on metal parts.
Plastic sheeting or a special AC cover: To cover window AC unit during storage.
Packing tape or strong string: To secure the cover or wrap window AC for storage.
Small container (like a plastic bag): To keep screws or small parts safe.

Gather everything in one place. This way, you won’t have to stop once you start working on the unit. Being prepared makes the job go faster.

Safety First Steps

Working with electrical items like AC units needs care. Always think about safety.

Unplug the unit: This is the most important step. Make sure the power cord is completely out of the wall socket. You don’t want any power going to the unit while you are cleaning or moving it.
Let it cool down: If the unit was running recently, give it some time to cool off before you start touching it.
Work in a well-lit area: You need to see what you are doing clearly to clean well and avoid mistakes.
If moving, get help: These units can be heavy. Don’t try to lift a large one by yourself. Ask a friend or family member for help to avoid back strain or dropping the unit.
Be careful of sharp fins: The metal fins on the coils are very thin and can cut you easily. Work carefully around them. Wearing gloves helps here.

Taking these simple safety steps protects you. It also protects your AC unit from damage.

The Big Clean: Clean AC Before Storing

Cleaning your AC unit before putting it away is a key step. It’s one of the most important AC storage tips. Dirt, dust, mold, and mildew can build up inside. Leaving them there all winter is bad. It can cause smells, damage parts, and make the unit work less well next year. A clean AC unit is a happy AC unit.

Taking Out the Air Filter

The air filter is usually easy to get to. It’s often on the front of the unit.

Find the filter: Check your owner’s manual if you’re not sure where it is.
Remove it carefully: It usually slides out or has clips you release.
Clean or replace: If you have a reusable filter, wash it with warm water and mild soap. Let it dry fully. If it’s a disposable filter, throw the old one away and plan to put a new one in next year before you use the AC again.

A dirty filter makes the AC work harder. Cleaning or replacing it is a simple first step.

Cleaning the Front Panel and Casing

The outside of the unit gets dusty and maybe a bit grimy.

Wipe it down: Use a damp cloth with a little bit of mild soap. Wipe the front grill and the outer case.
Clean the inside of the front panel: If you can take the front panel off (check your manual), clean the inside too. Dust gathers there.
Dry it well: Use a dry rag to wipe away moisture.

Getting the outside clean makes the unit look better. It also removes dust that could get inside later.

Cleaning the Cooling Coils and Fins

This part needs careful work. The coils and fins are where the air gets cooled. They get very dirty.

Locate the coils: There are coils on the front (evaporator, inside the room) and back (condenser, outside the window) of the unit.
Use a vacuum: Gently use a vacuum with a brush attachment to suck out loose dust and debris from the fins. Work slowly so you don’t bend the fins.
Spray with cleaner: You can buy special AC coil cleaner, or use a mix of mild soap and water in a spray bottle. Lightly spray the coils. Let it sit for a few minutes (check cleaner instructions if using a special one).
Rinse carefully: You can use clean water in a spray bottle to rinse the cleaner off. Be careful not to get too much water on electrical parts. Some coil cleaners do not need rinsing.
Straighten bent fins: If any fins are bent, you can gently try to straighten them with a fin comb or a thin, dull knife. Be very gentle.

Cleaning the coils is vital. It helps the unit cool air well and stops mold from growing. This is a key part of how to store window air conditioner units correctly.

Cleaning the Fan Blade

The fan moves the air over the coils. It can get dusty and dirty.

Find the fan: It’s usually behind the coils. You might need to look into the unit.
Wipe the blades: If you can reach the fan blades safely, wipe them with a damp cloth.
Use a brush: A small brush can help loosen dirt on the blades.
Be careful: Don’t bend the fan blades. This can make the fan unbalanced and noisy.

A clean fan moves air better. This makes the AC more effective.

Getting Rid of Water: Drain Water From Air Conditioner

Window AC units collect water. This happens as they cool the air. This water usually drips out the back while the unit is in the window. But when you take it out, there can still be water inside the pan at the bottom. You must drain water from air conditioner units before storing them. Leaving water inside is a big problem.

Why Draining is Important

Prevents mold and mildew: Water inside is a perfect place for mold and mildew to grow. This causes bad smells. It can also spread mold spores into your home when you use the unit again.
Prevents rust: Metal parts sitting in water will rust. Rust can damage the unit and make it break down faster. Preventing rust on AC unit parts is a major goal of storage.
Prevents freezing damage: If you store the unit somewhere cold, like a garage, any water left inside can freeze. Water expands when it freezes. This can crack the water pan or other parts of the unit.

How to Drain the Water

Tilt the unit: The easiest way is to tilt the unit carefully towards the back (the side that faced outside). You might need help with this as the unit can be heavy. Tilt it over a bucket or a drain.
Look for drain holes: Some units have specific drain holes or plugs. Check your manual. If it does, remove the plug to let the water flow out.
Let it sit and drain: Keep the unit tilted until no more water comes out. This might take a few minutes.
Wipe the pan: If you can access the water pan at the bottom, wipe it out with a dry cloth to get any last bits of moisture.

Make sure the unit is as dry as possible inside. This step is crucial for protecting AC during off-season storage.

Drying Time: Letting the AC Unit Air Out

After cleaning and draining, the unit will still be a little damp inside. You need to make sure it is completely dry before you wrap it up and store it. Any moisture left inside can cause problems later.

Why Drying is Key

Stops mold and mildew: Just like draining, drying fully prevents mold growth.
Prevents rust: Metal parts must be dry to avoid rust. Preventing rust on AC unit means making sure it’s fully dry.
Prevents smells: Moisture trapped inside can cause musty odors.

How to Ensure it’s Dry

Leave it open: If you removed the front panel or air filter, leave them off. This lets air get inside the unit.
Choose a good spot to dry: Put the unit in a place where air can flow around it. A garage or a porch on a dry day is good.
Give it time: Let the unit sit and air dry for at least 24 hours. More time is better, especially if it was very wet.
Use a fan (optional): You can point a fan at the unit to help air circulate and speed up drying.
Check hard-to-reach spots: Look into the areas you cleaned, like around the fan or in the water pan area, to see if they look and feel dry. Use a flashlight if needed.

Be patient during this drying phase. Don’t rush to wrap it up. A fully dry unit is ready for storage.

Protecting the Unit: Cover Window AC Unit & Prevent Rust

Once your AC unit is clean and totally dry, it’s time to get it ready for its long sleep. This involves protecting the outside and the parts from dust, dirt, pests, and moisture.

Applying Rust Prevention

Some metal parts, especially on the condenser coils (the back outside part), can be prone to rust, particularly in places with high humidity.

Identify vulnerable spots: Look for exposed metal parts, screws, or seams on the outside of the unit.
Use a rust inhibitor: You can buy a spray that helps prevent rust. Lightly spray these metal areas.
Follow product directions: Make sure the spray is safe for use on appliances. Don’t spray on electrical parts.
Wipe excess: Wipe away any excess spray.

This extra step helps prevent rust on AC unit components, extending the unit’s life.

Covering or Wrapping the Unit

Wrapping or covering the unit protects it from dust, dirt, and pests while it’s in storage. This is a key AC storage tip.

Use a special AC cover: You can buy covers made specifically for window AC units. These are the best option. They fit well and are made of breathable material that still keeps dust out. Cover window AC unit completely with this cover.
Use plastic sheeting: If you don’t have a special cover, you can use thick plastic sheeting. Wrap the unit fully in the plastic. Use packing tape to seal the seams. Make sure the plastic doesn’t have holes. The goal is to create a barrier.
Consider breathability vs. protection: While plastic is good for keeping out dust and pests, a breathable fabric cover is sometimes preferred if storing in a place where small changes in humidity might happen, as it allows some air flow. However, for keeping pests and dirt out completely, a well-sealed plastic wrap is often better. Choose based on your storage location. Wrap window AC for storage securely.
Secure the wrap/cover: Use tape or string to make sure the cover or plastic stays on tightly. You don’t want it to fall off and expose the unit.

Properly covering or wrapping the unit is like putting a protective layer around it. It keeps it clean and safe during winter storage air conditioner downtime.

Finding the Right Spot: Storing AC Unit in Garage or Elsewhere

Where you store your AC unit matters a lot. The storage location should be chosen carefully to keep the unit safe from damage.

Best Storage Locations

The best places are clean, dry, and stable in temperature.

Inside your home: A closet, basement, or spare room is ideal. These areas are usually dry and have controlled temperatures. Storing it inside prevents it from getting too cold or too hot.
Heated garage or shed: If your garage or shed is heated and stays relatively dry, this can work. Make sure it doesn’t get damp.
Climate-controlled storage unit: If you use one for other items, this is a great option.

Places to Avoid

Some places are bad for storing AC units.

Damp basement: A basement with high humidity can lead to rust and mold, even if the unit is cleaned and covered.
Unheated garage or shed: Places that get very cold can cause problems if any moisture was left inside. Freezing and thawing can damage parts. Large temperature swings can also be bad.
Outside: Never store a window AC unit outside, even if it’s covered. It will be exposed to rain, snow, extreme temperatures, and pests.
Attic: Attics can get extremely hot in the summer and very cold in the winter. These temperature extremes are bad for the unit’s parts.

How to Position the Unit for Storage

How you place the unit matters too.

Store it upright: The best way to store air conditioner units is usually upright, in the same position it would be if it were sitting on a flat surface (not tilted like in the window). Storing it on its side or upside down can cause problems. Oil from the compressor can seep into parts where it shouldn’t be.
Keep it off the floor (if possible): If storing in a garage or basement that might get damp, try to store the unit on a shelf or on some blocks of wood. This keeps it off the concrete floor, which can be cold and might have moisture.
Store away from chemicals: Don’t store the unit near paint, solvents, or other chemicals. Fumes can potentially damage the plastic or metal parts.
Avoid heavy items on top: Don’t stack heavy boxes or items on top of the AC unit. This can damage the casing or internal parts.

Following these AC storage tips for location and position ensures your unit is safe during its off-season break. Storing AC unit in garage or basement is common, but make sure it’s the right kind of garage or basement – dry and not too cold.

Long-Term Storage AC Storage Tips

Proper storage is part of a good maintenance plan for your unit. It’s not just about putting it away; it’s about keeping it ready for next year. Protecting AC during off-season downtime extends its useful life.

Why Proper Storage Extends Unit Life

Prevents damage: Keeping out dust, dirt, pests, moisture, and extreme temperatures stops parts from breaking down.
Reduces wear and tear: A clean unit that is stored correctly starts the next season in good shape, so its parts don’t have to work as hard initially.
Avoids costly repairs: Problems caused by poor storage, like rust or mold damage, can be expensive to fix. Proper storage prevents these.
Maintains efficiency: A unit kept clean and dry will cool better and use less energy when you start it up again.

Summary of the Best Way to Store Air Conditioner

Let’s quickly go over the key steps again. These are the best ways:

Prepare: Gather tools, work safely (unplug!).
Clean: Take out the filter (clean/replace), clean the outside, carefully clean the coils and fan. Clean AC before storing is vital.
Drain: Tilt the unit to drain water from air conditioner pan. Make sure no water is left.
Dry: Let the unit air dry completely, inside and out, for at least 24 hours.
Protect: Apply rust prevention if needed. Wrap window AC for storage tightly with plastic or use a dedicated cover window AC unit.
Store: Choose a dry, stable location (inside home or heated space is best). Store upright and off the floor if possible. This is the core of winter storage air conditioner plans.

Checklist Before Putting Away

Use this quick list to make sure you did everything:

Unit is unplugged? Yes / No
Filter is cleaned or removed? Yes / No
Coils and fan are cleaned? Yes / No
All water is drained out? Yes / No
Unit is completely dry? Yes / No
Rust inhibitor applied (if needed)? Yes / No
Unit is covered or wrapped well? Yes / No
Storage location is dry and safe? Yes / No
Unit is stored upright? Yes / No
Small parts (like screws) are saved? Yes / No (If you removed any)

Having a simple list helps make sure you don’t miss anything important when storing AC unit in garage or other places.

Preparing for Next Season After Storage

When warmer weather returns, you will want to get your AC unit ready to go back in the window. Because you took the time for proper winter storage air conditioner care, this process will be much easier.

What to Do Before Reinstalling

Unwrap and inspect: Take off the cover or plastic wrap. Look closely at the unit. Check for any signs of damage, rust, or pest activity that might have happened during storage.
Wipe it down: Give the outside a quick wipe to remove any dust that might have settled on the cover or unit itself.
Clean the filter (again) or insert new one: Even if you cleaned the reusable filter, give it a quick rinse if needed. If you use disposable filters, put a new one in now.
Check cords and plugs: Make sure the power cord and plug are not damaged.
Inspect the seal/foam: The foam strips or seals that go around the unit in the window frame can get old. Check if they are still good. Replace them if they are cracked or no longer spongy. This helps seal your window properly and keeps cool air in and hot air out.

By doing these checks, you make sure the unit is ready and that it will be set up correctly for the season ahead.

Common Mistakes to Avoid

Knowing what not to do is as important as knowing what to do. Avoid these common errors.

Storing wet: This is perhaps the worst mistake. It leads to mold, rust, and potential freezing damage. Always drain water from air conditioner and let it dry fully.
Not cleaning: Leaving dirt and mold inside makes the unit less efficient, can cause bad smells, and might damage components over time. Clean AC before storing is not optional.
Storing outside: Exposure to the elements is guaranteed to damage the unit.
Storing in damp or humid places: Even if drained and dried, sitting in a high-humidity environment can cause problems like rust (defeating efforts to prevent rust on AC unit parts) or affect electrical components.
Stacking things on top: The weight can break the unit’s casing or frame.
Storing on its side: This can cause oil to leak into the wrong parts of the compressor system, potentially ruining the unit. Always store upright.
Not covering: Leaving the unit uncovered means dust, dirt, and pests can get inside. Cover window AC unit securely.

Avoiding these mistakes ensures your careful work in cleaning, draining, and drying isn’t wasted. It guarantees protecting AC during off-season effectively.

Thinking About Different Types of Units

Most window AC units are similar, but there can be small differences.

Size: Larger units are heavier and need more care when moving. Always get help.
Digital controls: Units with digital displays and remote controls have more sensitive electronics. Be extra careful not to get water on these parts when cleaning. Make sure they are completely dry before storage.
Slide-out chassis: Some larger units have a part that slides out of the main case. You might be able to clean inside more easily with this type. Follow your manual for how to take it apart and put it back together.

Always check your specific unit’s owner’s manual. It might have special instructions for cleaning or storing that are unique to your model. This is part of finding the best way to store air conditioner units specific to yours.

Beyond Just Storing: Thinking Long Term

Taking care of your window AC unit is an investment. Proper storage is a big part of that investment.

Longevity: Units stored properly can last many more years than those neglected.
Performance: A well-maintained and well-stored unit will cool your home more effectively and efficiently.
Air Quality: Cleaning prevents mold and dust buildup, leading to cleaner air in your home when you use the unit.
Cost Savings: Avoiding repairs and needing to replace the unit sooner saves you money.

These AC storage tips are not just chores; they are steps that lead to better performance and longer life for your air conditioner. They are essential for effective winter storage air conditioner care and protecting AC during off-season months.

Table: Quick Storage Steps Guide

Here is a simple table summarizing the main steps:

Step	Action	Why It’s Important	Key Tip
Prepare	Gather supplies, unplug unit.	Safety first, have everything ready.	ALWAYS unplug the power cord!
Clean	Filter, exterior, coils, fan.	Remove dirt, dust, mold, and grime. Clean AC before storing.	Be gentle with coils/fins. Use proper cleaners.
Drain	Tilt unit to let water out.	Prevents mold, rust, and freezing damage. Drain water from air conditioner.	Tilt towards the back; ensure all water is out.
Dry	Let unit air dry fully.	Stops mold and rust from any leftover moisture.	Allow at least 24 hours in a well-aired spot.
Protect	Apply rust inhibitor, cover or wrap unit.	Keeps out dust, pests; prevents rust on AC unit parts. Cover window AC unit / wrap window AC for storage.	Use a proper AC cover or seal tightly with plastic.
Store	Choose a dry, safe spot; store upright.	Protects unit from temperature, humidity, damage. Storing AC unit in garage? Make sure it’s dry & heated.	Avoid damp basements, attics, or outside areas. Store upright.

This table gives a quick overview of the process. Each step is important for the best way to store air conditioner.

FAQ: Questions About AC Storage

Here are answers to some common questions about storing window AC units.

Q: Can I just leave my window AC unit in the window all winter?
A: It is generally not recommended. Leaving the unit in the window exposes it to harsh winter weather – snow, ice, freezing rain, and very cold temperatures. This can damage the unit, the window frame, and create drafts into your home. Removing, cleaning, and storing it properly is the best way to protect it.

Q: How often should I clean my window AC unit before storing it?
A: You should clean your unit thoroughly every time you put it away for the season. This means cleaning the filter, coils, fan, and casing each autumn before winter storage air conditioner time begins.

Q: What kind of cover should I use to cover window AC unit?
A: A cover specifically designed for window AC units is best. These are often made of durable, sometimes breathable, material. If you can’t find one, heavy-duty plastic sheeting works well. Make sure it’s thick and you seal it tightly with tape to keep out dust and pests.

Q: I stored my AC unit in the garage, but it got cold and damp. Is it ruined?
A: It might not be ruined, but it’s at risk. If it wasn’t fully drained and dried, water could have frozen and expanded, potentially causing damage. Dampness can also lead to rust. Before using it again, let it warm up in a dry place for a few days. Inspect it very carefully for any visible damage or rust. If you see problems, have it checked by a professional. This highlights why storing AC unit in garage areas that are unheated or damp is risky.

Q: How do I prevent rust on AC unit if I live somewhere humid?
A: The most important step is making sure the unit is completely dry inside and out before storage. Storing it in a low-humidity environment (like inside your home with humidity control) is best. You can also use a rust-inhibitor spray on vulnerable metal parts after cleaning and drying, following the product’s instructions carefully.

Q: Do I need to buy special cleaner for the coils?
A: While special AC coil cleaners are available and effective, you can often clean the coils well enough with a mixture of mild dish soap and water. Be sure to rinse thoroughly if the cleaner requires it, and always let the unit dry completely afterward.

Q: Can pests get into my AC unit during storage?
A: Yes, mice, insects, and other pests can get into stored units, especially if they are not sealed well. This is why it’s important to cover window AC unit tightly, either with a dedicated cover or sealed plastic wrap. Store the unit off the floor if storing in a garage or basement where pests might be.

These steps and tips provide the best way to store air conditioner units. By following them, you ensure your unit is protected, lasts longer, and works efficiently when you need it most. Taking the time for proper AC storage tips pays off. Protecting AC during off-season means less hassle and more cool air next summer. Remember, a little work now saves bigger problems later.