How to Winterize Your Window Air Conditioner: A Definitive Guide

Winterizing your window air conditioner is crucial to protect it from the harsh elements and prevent drafts from seeping into your home, saving you money on heating costs and extending the life of your appliance. Proper winterization involves removing or securely covering the unit, preventing water damage, and ensuring it’s ready for efficient operation when warmer weather returns.

Why Winterizing Your Window AC Matters

Leaving a window air conditioner exposed to winter weather can lead to a host of problems. First and foremost, the unit becomes vulnerable to water damage. Snow and ice can melt and seep into the components, leading to rust, corrosion, and eventual malfunction. Secondly, the gap around the unit creates a significant air leak. This allows cold air to infiltrate your home, forcing your heating system to work harder and resulting in higher energy bills. Thirdly, the constant exposure to freezing temperatures and moisture can degrade the internal components of the air conditioner, shortening its lifespan. By taking the time to winterize, you’re investing in the longevity and efficiency of your unit.

Step-by-Step Winterization Guide

This guide provides a comprehensive approach to winterizing your window air conditioner, ensuring its protection and your comfort throughout the colder months.

1. Determine the Best Course of Action: Remove or Cover?

The first step is deciding whether to remove the air conditioner entirely or simply cover it. Removal is generally the preferred option, especially in areas with harsh winters or if the unit is heavy and poses a potential safety hazard. However, if removal is impractical due to size, weight, or installation complexity, a well-sealed cover will suffice.

2. Preparing for Removal (If Applicable)

• Unplug the Unit: Always disconnect the air conditioner from the power outlet before beginning any work. This is a crucial safety precaution.
• Gather Supplies: Have the necessary tools on hand, such as a screwdriver, wrench, and possibly a helping hand, depending on the unit’s weight.
• Clean the Air Conditioner: Wipe down the exterior and interior of the unit to remove dust, dirt, and debris. This prevents these contaminants from causing issues during storage.

3. Removing the Window Air Conditioner

• Detach the Supports: Carefully remove any brackets, supports, or mounting hardware securing the unit to the window frame.
• Lift and Remove: With assistance if needed, gently lift the air conditioner out of the window. Be mindful of its weight and avoid straining yourself.
• Secure the Window: Once the unit is removed, close and lock the window. If there are any gaps, use weather stripping or insulation to seal them.

4. Storing the Removed Air Conditioner

• Clean Thoroughly: Before storing, perform a more thorough cleaning, paying attention to the fins and coils.
• Store Upright: Store the air conditioner upright to prevent oil from leaking out of the compressor.
• Choose a Dry Location: Select a cool, dry place for storage, such as a basement, garage, or shed, away from direct sunlight and moisture.

5. Covering the Window Air Conditioner (If Not Removing)

• Clean the Unit: Clean the exposed portion of the air conditioner thoroughly, removing any dirt or debris.
• Purchase a Cover: Invest in a durable, waterproof air conditioner cover designed specifically for window units.
• Secure the Cover: Carefully fit the cover over the air conditioner, ensuring a snug and secure fit. Use tape or other fasteners to further seal the edges.
• Insulate the Gaps: Use weather stripping or insulation to seal any gaps between the air conditioner and the window frame to prevent drafts.

6. Additional Insulation Measures

Regardless of whether you remove or cover the unit, consider these additional insulation measures for optimal energy efficiency:

• Window Film: Apply window film to the interior surface of the window to reduce heat loss.
• Insulated Curtains: Use heavy, insulated curtains or drapes to further block drafts and cold air.
• Draft Snakes: Place draft snakes along the bottom of the window to seal any remaining gaps.

Frequently Asked Questions (FAQs)

1. Can I just leave my window AC unit in place without covering it?

While you can, it’s strongly discouraged. Unprotected units are susceptible to water damage, air leaks, and accelerated deterioration due to exposure to the elements. Leaving the unit uncovered can significantly reduce its lifespan and increase your heating bills.

2. What type of cover should I use for my window AC unit?

Opt for a heavy-duty, waterproof cover specifically designed for window air conditioners. Ensure it fits snugly and securely to prevent moisture and drafts from entering. Avoid using makeshift covers, like trash bags, as they are not durable enough and can trap moisture.

3. How do I clean my window AC unit before winterizing it?

Use a mild detergent and water solution to clean the exterior and interior of the unit. For the fins, a soft brush or vacuum cleaner with a brush attachment can remove dust and debris. Avoid using harsh chemicals or abrasive cleaners, as they can damage the components. Allow the unit to dry completely before covering or storing it.

4. Is it okay to store my window AC unit on its side?

No, storing the unit on its side is generally not recommended. It can cause the oil in the compressor to leak, potentially damaging the unit. Always store the air conditioner in an upright position.

5. How can I prevent condensation from forming inside the cover?

Ensure the cover is breathable to allow for some air circulation. Using desiccant packets inside the cover can also help absorb moisture. Regularly check under the cover for any signs of condensation.

6. What if my window AC unit is too heavy to remove?

If the unit is too heavy to remove safely, focus on thoroughly covering and sealing it. Use a high-quality cover and ensure all gaps are sealed with weather stripping or insulation. Consider enlisting the help of a professional if needed.

7. Can I still use my window AC unit during mild winter days?

It’s generally not recommended to operate a window AC unit in temperatures below 60°F (15°C). This can damage the compressor and reduce its efficiency.

8. How much does it cost to winterize a window AC unit?

The cost can vary depending on whether you choose to remove or cover the unit and the materials you use. A cover can range from $20 to $50, while weather stripping and insulation typically cost less than $20. Removing the unit yourself is free, but hiring a professional may cost $50 to $100.

9. What happens if I don’t winterize my window AC unit?

Failing to winterize your window AC unit can result in water damage, air leaks, increased heating costs, and a shortened lifespan for the appliance.

10. How do I know if my window is properly sealed after winterizing the AC unit?

Check for drafts around the window frame. Use a lit candle or incense stick to detect air movement. If the flame flickers or the smoke wavers, there’s likely a leak.

11. What if I see mold growing on my window AC unit before winterizing?

Clean the mold with a mild bleach solution (1 part bleach to 10 parts water). Ensure the unit is completely dry before covering or storing it. Consider wearing gloves and a mask while cleaning to protect yourself from mold spores.

12. How often should I check on my winterized window AC unit during the winter months?

Check on the unit periodically, especially after heavy snow or rain, to ensure the cover is still secure and there are no signs of water damage or leaks. Addressing any issues promptly will prevent further damage.