As the weather cools down, many homeowners are preparing to store their window air conditioners for the winter. Proper storage helps maintain the unit's efficiency and prolong its lifespan. According to HVAC technician Josh Mitchell, leaving the unit in place all winter can reduce its lifespan, but improper storage after removal can also lead to problems. Experts recommend cleaning and storing the unit correctly to ensure it's ready for use when warm weather returns. The general rule for turning off an air conditioner is when the outdoor temperature consistently drops below 60 degrees Fahrenheit, according to Ben Green, an associate at The Chill Brothers, an HVAC service company in Texas. Keeping the unit on when it's no longer needed can allow cold air to leak into the home. It’s also not advisable to wait for the first frost, as freezing temperatures can damage the unit. Removing the air conditioner involves several steps to make the process easier. After unplugging the unit, removing the seals and weather stripping helps prevent it from sticking when pulled out. Unscrewing or unclipping any brackets holding the unit in place is also necessary. Tilt the unit slightly inward as it is lifted to prevent leftover water from splashing back into the home. Care should be taken to avoid damaging the window frame or sill, and placing the unit on a towel can help catch any remaining water. Cleaning the air conditioner before storage is crucial to maintain its efficiency and prevent mold growth. Experts recommend wiping down the outside of the unit and cleaning or changing the air filter. If dirt is visible on the coils, they can be vacuumed or cleaned lightly. Josh Mitchell suggests washing the filter with a mild solution of soap and water. Products like Frost King’s foaming coil cleaner can be used to dissolve dirt, grease, and oil from coils, fan blades, and reusable filters. This product is water-based, low-VOC, lemon-scented, and doesn’t need rinsing. It also helps neutralize odors from standing water in drain pans. After cleaning, it's important to ensure the unit is completely dry before storage. Any damp spots should be wiped down, and the unit should be left to sit in a cool, dry place until it's certain that no moisture remains. If the original box is still available, it's the best place for storage. If not, wrapping the unit in plastic can help keep out dampness, dust, and critters. The unit should be stored upright, the same way it is in a window, to prevent damage from residual fluids. Ideal storage locations include a garage, cellar, or closet, which are dry and away from extreme temperatures. Sheds and attics should be avoided as they can get extremely damp or cold in the winter, which can cause rust and electrical damage.