Can You Leave Air Conditioner in Window During Winter? The Definitive Guide
The short answer is: it’s generally not recommended to leave your window air conditioner in place during the winter. While technically possible, leaving it installed can lead to energy loss, potential damage to the unit and your window frame, and reduced indoor air quality. This article will explore the reasons why and provide you with alternatives for winterizing your AC unit.
The Risks of Leaving Your AC in the Window During Winter
Leaving a window air conditioner in place during the winter months might seem like a convenient solution, saving you the effort of removal and storage. However, this convenience comes at a cost.
Energy Loss and Increased Heating Bills
Window AC units are not designed to withstand extremely cold temperatures. The casing and seals are not airtight, creating significant air leaks. This means that cold air can easily seep into your home, forcing your heating system to work harder and increasing your energy bills. The thermal break is compromised, turning your window unit into a thermal bridge that conducts cold directly into your home. This results in a substantial energy penalty, negating any perceived convenience.
Potential Damage to the Unit
Freezing temperatures can wreak havoc on the internal components of your air conditioner. Moisture that has accumulated inside the unit can freeze and expand, damaging coils, fans, and other sensitive parts. Furthermore, repeated freezing and thawing cycles can lead to corrosion and premature wear.
Compromised Window and Frame
The weight of the AC unit, combined with the expansion and contraction caused by temperature fluctuations, can put stress on your window frame. This can lead to warping, cracking, and even seal failure, allowing drafts and moisture to infiltrate your home. This is especially true for older windows that are already susceptible to damage.
Reduced Indoor Air Quality
A window air conditioner left in place during the winter can become a breeding ground for mold and mildew. Dust, pollen, and other allergens can accumulate inside the unit, creating an unhealthy environment. When you eventually turn the AC back on in the spring, these contaminants will be circulated throughout your home.
Alternatives to Leaving Your AC in the Window
Instead of risking damage and energy loss, consider these alternative solutions for winterizing your window AC unit:
Removing and Storing the Unit
This is the most recommended approach. Remove the AC unit from the window, clean it thoroughly, and store it in a dry, protected location, such as a garage, basement, or storage shed. This prevents exposure to harsh winter conditions and minimizes the risk of damage.
Covering the Unit
If removing the AC unit is not feasible, covering it both indoors and outdoors is a viable alternative. Use a heavy-duty AC cover designed for winter protection. Ensure the cover is secure and airtight to prevent drafts and moisture buildup.
Insulating Around the Unit
Regardless of whether you cover the AC unit or not, insulating around the edges with weather stripping or foam insulation can help to seal any gaps and prevent cold air from entering your home. This is particularly important if you are leaving the unit in the window.
FAQs: Winterizing Your Window AC Unit
Here are some frequently asked questions to further clarify the proper care of your window AC unit during the winter:
FAQ 1: What type of cover should I use for my window AC unit in the winter?
A heavy-duty, waterproof AC cover specifically designed for window units is the best choice. Look for covers that are made from durable materials like vinyl or polyester and have features like elastic edges or straps to ensure a snug fit. Indoor covers are also useful for preventing drafts and keeping out dust.
FAQ 2: How do I clean my AC unit before storing it for the winter?
Unplug the unit and use a vacuum cleaner to remove any loose dust and debris. Then, wipe down the exterior with a damp cloth. For the interior, use a coil cleaner specifically designed for air conditioners. Be sure to let the unit dry completely before storing it.
FAQ 3: Can I just wrap my AC unit in plastic wrap instead of buying a cover?
While plastic wrap may seem like a cheaper alternative, it is not recommended. Plastic wrap is not breathable and can trap moisture, leading to mold and mildew growth. It also doesn’t provide adequate insulation. A proper AC cover is a much better investment.
FAQ 4: What is the ideal storage location for my AC unit?
A dry, protected location is ideal. A garage, basement, or storage shed are all suitable options. Avoid storing the unit in areas where it will be exposed to extreme temperatures or moisture.
FAQ 5: Should I disconnect the power cord from the AC unit before storing it?
Yes, definitely disconnect the power cord from the AC unit before storing it. This prevents any accidental electrical hazards.
FAQ 6: How do I insulate around my AC unit if I leave it in the window?
Use weather stripping, foam insulation, or caulk to seal any gaps around the edges of the AC unit and the window frame. This will help to prevent drafts and cold air from entering your home. Make sure the insulation doesn’t block any necessary ventilation for the unit itself if you plan on occasionally running it during warmer winter days.
FAQ 7: Can I still run my AC unit occasionally during the winter if I leave it in the window?
While you technically can, it’s not advisable unless absolutely necessary. Running the AC unit in extremely cold temperatures can damage the compressor and other internal components. If you must run it, do so only for short periods and when the outside temperature is above freezing.
FAQ 8: Will leaving my AC unit in the window void its warranty?
It’s possible, especially if the damage is directly related to leaving it exposed to harsh winter conditions. Check your warranty information for specific details.
FAQ 9: Is it necessary to remove the window screen if I remove the AC unit?
While not absolutely necessary, removing the screen can help to prevent damage during the winter months. Snow and ice can accumulate on the screen, potentially causing it to tear or warp.
FAQ 10: What if I can’t physically remove my AC unit due to size or weight?
If you’re unable to remove the AC unit, focus on thorough covering and insulation. Consider enlisting the help of a friend or family member. Also, look into professional AC winterization services.
FAQ 11: How can I prevent mold and mildew growth in my AC unit during the winter?
Thoroughly clean and dry the AC unit before storing it. Consider using a dehumidifier in the storage area to reduce moisture levels. You can also place desiccant packets inside the unit to absorb any remaining moisture.
FAQ 12: Is there a professional service that can winterize my AC unit for me?
Yes, many HVAC companies offer AC winterization services. These services typically include cleaning, covering, and insulating the unit. This can be a convenient option if you are unable to do it yourself.
Conclusion
While the temptation to leave your window AC unit in place during the winter is understandable, the risks to your energy bill, the unit itself, and your home’s overall comfort outweigh the convenience. By following these guidelines and choosing the appropriate winterization method, you can protect your investment and ensure that your AC unit is ready to keep you cool when summer rolls around again. Take the time to properly winterize your unit, and you’ll reap the benefits of a longer lifespan, reduced energy costs, and improved indoor air quality.