How to Remove and Store a Window AC for Winter: A Step-by-Step Guide

When temperatures begin to drop, a window air conditioner may no longer be necessary for everyday comfort. If you live in a region with cold winters, removing the unit and storing it properly can help protect it from freezing temperatures, moisture, debris, and unnecessary wear.

However, taking out a window AC involves more than unplugging it and lifting it from the window. The unit can be heavy, the mounting hardware must be handled carefully, and the opening needs to be sealed to prevent cold drafts and moisture from entering your home.

Whether you are preparing your house for winter or making room for another window treatment, understanding how to remove and store a window AC for winter can make the process safer and more manageable.

This guide covers the tools you may need, the steps for removing the unit, the right way to clean and store it, and when a professional Window AC Installation Service can help. If you are putting a unit in rather than taking it out, see our guide on how to install a window air conditioner safely.

Why Remove a Window AC Before Winter?

Not every window air conditioner needs to be removed during the colder months. Some models can remain installed if the manufacturer permits it and the unit is properly protected. However, seasonal removal can be beneficial in areas that experience freezing temperatures, heavy snowfall, or winter storms.

Here are a few reasons homeowners choose to take their units out before winter. For general guidance on end-of-season care, see ENERGY STAR’s room air conditioner page.

1. Reduce Exposure to Harsh Weather

A window AC that remains outdoors is exposed to rain, snow, ice, wind, and temperature fluctuations. Although many units are designed for outdoor exposure during normal operation, prolonged winter conditions may create additional challenges.

Ice and accumulated debris can affect exposed components, while moisture may contribute to corrosion over time. Removing the unit and storing it indoors can reduce its exposure to these conditions.

Always consult the manufacturer’s guidance before deciding whether seasonal removal is necessary for your particular model.

2. Improve Window Insulation

An installed window air conditioner can leave gaps around the frame or side panels if the surrounding area is not properly sealed. During winter, these gaps may allow cold air to enter and warm indoor air to escape. ENERGY STAR suggests removing the unit at the end of the cooling season if possible, or using an appropriately sized cover during winter, to minimize heat loss.

Removing the unit allows you to close the window normally, inspect the frame, and install appropriate insulation or weatherstripping.

3. Make Room for Natural Light

Window ACs can occupy a significant portion of a window opening. Removing the unit during winter can restore access to natural light and allow you to use the window as intended.

4. Make Seasonal Maintenance Easier

Removing the unit gives you an opportunity to clean the filter, inspect the housing, check accessible seals, and look for visible damage before storing it.

Routine maintenance can help you identify issues that may need attention before the next cooling season.

Tools and Supplies You May Need

Gather your supplies before beginning the removal process. Having everything nearby can reduce the time the window remains open and help you avoid unnecessary handling.

Depending on your AC model and mounting arrangement, you may need:

• A screwdriver or drill with the appropriate bit
• A helper to support and lift the unit
• Work gloves
• A soft cloth or microfiber towel
• Mild detergent and water for approved cleaning tasks
• A vacuum with a soft brush attachment
• A stable, clear surface for temporarily placing the unit
• A suitable indoor storage location
• Window insulation, weatherstripping, or a temporary window-sealing panel
• Appropriate tools for removing the existing mounting brackets

You may also need a ladder or other access equipment for certain installations. If the unit is high above the ground or requires working in an unsafe position, arrange professional assistance rather than attempting the removal yourself.

The exact tools will depend on the unit’s weight, window type, and installation method.

Step-by-Step Guide to Removing a Window AC for Winter

1. Step 1: Turn Off and Unplug the Unit

   Switch off the air conditioner and disconnect it from the electrical outlet before touching the mounting hardware.

   Allow the unit to stop operating completely. Follow the manufacturer’s instructions for any additional shutdown or drainage procedures.

   Do not begin removing screws, panels, or brackets while the unit is connected to power. If the outlet, plug, or cord shows signs of damage, do not handle the electrical components beyond what is safe; seek qualified assistance.

2. Step 2: Prepare the Area Around the Window

   Move furniture, curtains, decorations, and other objects away from the work area. Clear enough floor space to accommodate the AC once it has been removed.

   Open the window only as required by the installation design. Keep children and pets away from the work area, and avoid placing tools where they could fall.

   Before loosening anything, inspect how the unit is secured. Look for side-panel fasteners, sash locks, support brackets, and any additional hardware described in the installation manual.

   If the AC is installed above ground level, make sure there is no risk of the unit falling outside while you work.

3. Step 3: Remove the Side Panels and Fasteners

   Many window ACs use expandable side panels to close the gaps between the unit and the window frame.

   Depending on the model, you may need to remove screws securing these panels, release clips, or loosen fasteners connecting the AC to the window sash.

   Follow the manufacturer’s removal sequence. Keep screws and small parts together in a labeled bag so they are easy to locate when you reinstall the unit.

   Do not force a panel or bracket that will not release. Forcing the hardware can damage the window frame, the AC housing, or the mounting system.

4. Step 4: Support the Air Conditioner Before Releasing It

   This is the most important stage of the removal process.

   Window air conditioners can be heavy, bulky, and difficult to grip. Their weight distribution may also make them harder to control than expected.

   Have a capable helper support the unit while you release the remaining fasteners. Keep the manufacturer’s recommended lifting and handling instructions in mind.

   Never assume the window sash alone is holding the unit securely. If the installation uses exterior support brackets, understand how those brackets work before loosening any part of the assembly.

   If the AC is too heavy to handle safely, the window is difficult to access, or the unit begins to shift unexpectedly, stop and arrange professional removal.

5. Step 5: Slide the Unit Out Carefully

   Once all required fasteners and supports have been released in the correct sequence, move the AC inward and out of the window according to the manufacturer’s instructions.

   Keep the unit under control throughout the process. Avoid sudden movements, twisting, or attempting to lift it by the power cord, grille, or other parts not designed to bear its weight.

   Place it on a stable surface that can support it without blocking ventilation openings or damaging the housing.

   Do not tilt or lay the AC on its side unless the manufacturer explicitly permits it. Some models contain components and fluids that require specific handling and settling procedures.

   If water remains in the unit, follow the manual’s drainage instructions. Do not assume every model drains in the same way.

6. Step 6: Remove the Mounting Hardware

   After the AC is safely out of the window, remove any brackets, screws, or other hardware that will not remain in place for winter.

   Inspect the window frame for loose fasteners, damaged wood, deteriorated sealant, or other visible problems.

   Keep reusable hardware together with the unit’s accessories. If a bracket is bent, corroded, or damaged, check the manufacturer’s replacement requirements before reinstalling the AC next season.

   Avoid disturbing electrical wiring or attempting repairs that require specialized skills.

7. Step 7: Close and Seal the Window

   With the AC removed, inspect the window opening and close the sash if the window design allows it.

   Check the weatherstripping and surrounding frame for gaps. Repair damaged seals where appropriate and use a suitable insulation solution if the window does not close tightly. Small gaps can often be sealed with caulking.

   If the window must remain partially open because of its design, use a properly fitted, weather-resistant window panel or insulation system intended for that application.

   The goal is to reduce drafts and moisture intrusion without creating unsafe conditions or interfering with the window’s normal operation.

How to Clean a Window AC Before Storing It

Cleaning your unit before storage helps remove accumulated dust and makes it easier to inspect for problems before the next cooling season.

However, avoid excessive moisture and follow the cleaning instructions for your specific model.

Clean the Air Filter

Remove the filter according to the manufacturer’s instructions.

If the filter is washable, clean it using the recommended method and allow it to dry completely before reinstalling it or packing it separately. If it is disposable, replace it when appropriate rather than washing it.

A clean filter helps maintain airflow when the unit returns to service.

Wipe the Exterior

Use a soft, slightly damp cloth to remove dust and dirt from accessible exterior surfaces. Apply mild detergent only if permitted by the manufacturer.

Keep water away from electrical connections, controls, and openings where moisture could reach internal components.

Do not spray water directly into the unit or use a pressure washer.

Inspect Accessible Components

Look for visible damage, loose exterior panels, deteriorated seals, or signs of corrosion.

If you notice damaged wiring, unusual residue, persistent moisture, or other concerning signs, have the unit evaluated by a qualified technician before using it again.

Do not dismantle sealed refrigeration components or attempt refrigerant repairs as part of routine seasonal cleaning.

Allow the Unit to Dry Completely

Before storage, make sure the filter, exterior surfaces, and any other cleaned parts are fully dry.

Follow the manufacturer’s instructions for draining residual water and preparing the unit for storage. Proper drying helps reduce the risk of trapped moisture, odors, and mildew.

How to Store a Window AC Properly

Once the unit is clean and dry, choose a location that protects it from moisture, dust, accidental impacts, and extreme conditions.

1. Choose a Dry Indoor Location

   A dry storage room, suitable closet, or protected indoor utility area may work, provided there is enough space and the floor can support the unit.

   Avoid locations prone to flooding, condensation, or persistent dampness. A covered outdoor area is not necessarily a suitable substitute for indoor storage.

2. Keep the Unit Upright

   Store the AC in the orientation specified by the manufacturer, generally upright for conventional window units.

   Avoid stacking heavy objects on top of it or placing it where it could fall over. If the manufacturer requires a settling period after the unit has been tilted during removal, follow that guidance before operating it again.

3. Protect It From Dust

   Use the original packaging if it is available and suitable for storage. Otherwise, choose a breathable protective cover or a storage method recommended by the manufacturer.

   Do not seal a unit in airtight plastic while moisture remains inside. Trapped moisture can contribute to mold, mildew, and corrosion.

4. Store Accessories Together

   Keep the remote control, removable panels, screws, brackets, and installation instructions in a labeled container near the AC.

   This makes the next installation easier and reduces the chance of losing parts over the winter.

5. Keep the Unit Away From Damage

   Choose a location where the AC will not be struck by moving furniture, exposed to dripping water, or obstructed by stored items.

   Avoid placing it directly on an uneven surface or in a position that places unnecessary stress on the housing.

How to Prepare the Window for Winter After Removing the AC

Removing the air conditioner is only half the job. The window opening also needs attention before cold weather arrives.

Check the following areas:

• Window sash: Make sure the window closes properly and locks securely.
• Weatherstripping: Replace worn or damaged seals where needed.
• Mounting holes: Inspect holes left by screws and repair them using materials appropriate for the window frame.
• Exterior gaps: Address visible openings around the frame with suitable exterior-rated sealant where appropriate.
• Interior drafts: Check for air movement around the frame and use compatible weatherstripping or insulation.
• Water intrusion: Look for signs of moisture around the sill and address the underlying cause.

Avoid blocking drainage paths or covering openings that are necessary for the window or building assembly to function correctly.

For rental properties, check the lease or ask the property manager before making permanent changes to the window frame. For frame repairs you would rather not tackle yourself, a handyman can help.

Should You Remove Your Window AC Yourself or Get Professional Help?

The right approach depends on the size of the unit, the type of window, and how securely the AC is mounted.

A small, accessible unit with straightforward hardware may be manageable for people who can safely handle its weight and follow the manufacturer’s instructions.

Professional assistance is worth considering when:

• The air conditioner is large or unusually heavy.
• The window is on an upper floor or above a difficult-to-access area.
• Exterior support brackets are complicated or difficult to reach.
• The frame or mounting hardware appears damaged.
• You need help removing the unit, checking the mounting area, or preparing for seasonal reinstallation.
• You are unsure how to secure the unit safely during removal.

A Window AC Installation Service may be helpful when the job involves more than lifting the unit out of the window. Depending on the service offered and the installation requirements, assistance may include handling the mounting hardware, checking the window opening, and preparing for the unit’s next installation.

Before scheduling, confirm that the service covers seasonal removal and any additional work you need. Not every installation service includes removal, storage, or window insulation, so clarify the scope beforehand.

Common Mistakes to Avoid When Storing a Window AC

A few preventable mistakes can create additional work when spring arrives.

• Removing the unit alone: An awkward lift can lead to injury or damage to the AC and window. Arrange help based on the unit’s size and weight.
• Forgetting to unplug it: Always disconnect power before handling the unit or its mounting hardware.
• Storing it while damp: Moisture trapped inside or around the unit can contribute to odors and corrosion.
• Laying it flat without checking the manual: The correct storage orientation depends on the manufacturer’s guidance. Keep the unit upright unless the instructions state otherwise.
• Leaving the window unsealed: Gaps around the opening can allow cold air and moisture to enter.
• Using an unsuitable cover: A cover that traps moisture can do more harm than good.
• Ignoring damaged mounting hardware: Bent brackets, loose screws, and deteriorated window frames should be addressed before the next installation.
• Assuming spring reinstallation will be identical: Check the unit, hardware, window frame, and installation instructions again before putting it back.

Frequently Asked Questions

Prepare Your Home for Winter With a Safer AC Removal

Removing a window air conditioner before winter can help protect the unit, improve window insulation, and make seasonal maintenance easier. The process requires careful handling, especially when the AC is heavy, the window is difficult to access, or the mounting hardware is complicated.

Start by checking the manufacturer’s instructions, disconnecting power, and arranging adequate help. Clean and dry the unit before storing it upright in a suitable location. Finally, inspect and seal the window opening to help keep cold drafts and moisture outside.

If you need help handling a heavy unit or preparing it for the next cooling season, a window AC installation pro can be a practical option. Confirm the scope of work in advance so you know whether removal, reinstallation, or related window work is included.

With the right preparation, you can protect your air conditioner during the colder months and make getting it ready for summer easier.

InstaService is a technology platform that connects homeowners and property managers with vetted local service experts. InstaService does not employ, own, or directly provide the professionals performing the work. This guide is general information; always follow your air conditioner manufacturer’s removal, cleaning, and storage instructions.