As the colder months approach, it’s time to think about preparing your air conditioners for winter. Proper winterization not only extends the life of your equipment but also ensures your home remains well sealed against drafts. In this blog post, we’ll provide you with a comprehensive guide on how to winterize both built-in and window-mounted air conditioners. With these steps, you can enjoy a more energy-efficient home and protect your valuable AC units.

Winterizing Built-In Air Conditioners

  1. Clean the Filters and Coils: Before storing your built-in air conditioner, clean or replace the filters to maintain optimal performance. Use a soft brush or vacuum cleaner to remove dust and debris from the coils.
  2. Turn Off the Power: Turn off the power supply to the air conditioner at the circuit breaker. This prevents the unit from accidentally turning on during the winter.
  3. Seal Gaps and Vents: Check for any gaps or vents around the air conditioner that could allow cold air to enter your home. Seal them with weatherstripping or caulk to prevent drafts.
  4. Cover the Unit: Cover the exterior of the air conditioner with a specialized air conditioner cover or a heavy-duty tarp. Secure it with bungee cords or straps to protect the unit from snow and ice.
  5. Check the Seals: Ensure that the seals around the air conditioner are intact and in good condition. Replace any damaged or worn seals to prevent drafts.
  6. Insulate the Window Opening: If your built-in air conditioner is installed in a window, consider insulating the window opening with a window insulation kit. This helps maintain a tight seal and prevents drafts.

Winterizing Window-Mounted Air Conditioners

  1. Clean the Unit: Before removal, clean the window-mounted air conditioner, including the coils, filters, and exterior. This ensures it’s ready for storage and prevents dirt buildup during the off-season.
  2. Turn Off the Power: Like built-in units, turn off the power supply at the circuit breaker to prevent accidental activation during the winter.
  3. Remove the Unit: Carefully remove the window-mounted air conditioner from the window. Enlist the help of a friend if it’s heavy or bulky.
  4. Seal the Window Opening: Once the unit is removed, seal the window opening to prevent drafts. You can use weatherstripping or a window insulation kit.
  5. Store the Unit Properly: Store the air conditioner in a dry, cool place, such as a basement or garage, to protect it from the elements. Cover it with a cloth or tarp to prevent dust buildup.
  6. Check for Damaged Seals: Inspect the seals on the air conditioner to ensure they are in good condition. Replace any damaged seals before reinstalling the unit in the spring.

Products for Winterization

For all your winterization needs, including weatherstripping, window insulation kits, air conditioner covers, and cleaning supplies, visit Osoyoos Home Hardware. Their experts can recommend the right products for your specific air conditioning units and home.


Winterizing your air conditioners is essential for extending the life of your equipment and maintaining a draft-free home during the colder months. Whether you have built-in or window-mounted units, following the steps outlined in this guide will help you protect your investment and ensure a more energy-efficient living space. For the products and guidance you need, visit Osoyoos Home Hardware, where you can find expert advice and top-quality winterization supplies. Stay warm, cozy, and draft-free all winter long!