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How to Store Window AC Units for Winter

Prepare Your Window AC for Winter Storage

As the temperatures drop and you begin researching the cost of pre-winter furnace inspection, it is time to think about your window air conditioners. Leaving a unit in the window all winter long is a recipe for disaster.

Drafts will chill your home, and the outdoor elements will cause unnecessary wear on the internal components. Proper storage protects your investment and ensures the unit is ready to perform when the heat returns.

Why You Should Not Leave Your AC in the Window

Window air conditioners are designed to withstand rain, but they are not built to be encased in ice or buried under heavy snow. Leaving the unit installed creates a massive air leak in your building envelope.

Cold air enters through the side curtains and the chassis, forcing your heating system to work twice as hard. This can be especially problematic for property owners following a pre-season HVAC checklist for landlords who want to maintain efficiency.

Step 1: Clean the Unit Thoroughly

Before you pull the unit out, give it a deep clean. Dust and moisture trapped inside during storage can lead to mold and mildew growth over the winter months.

  • Remove the front panel and wash the filter with warm, soapy water.
  • Use a soft brush or vacuum to remove dust from the evaporator coils.
  • If you notice buildup on the exterior, follow tips on how to clean the coils using similar gentle techniques.
  • Ensure the unit is completely dry before moving to the next step.

Step 2: Safe Removal and Drainage

Removing a window unit is a two-person job. These units are heavy and front-heavy, making them prone to falling outward if not handled carefully.

Open the window and carefully tilt the unit inward to drain any residual water from the base pan. Stagnant water left inside will cause rust and foul odors during the off-season.

While you have the window open, inspect the seals. If you find gaps, you may need to address them just as you would when learning how to replace a bathroom exhaust fan motor to ensure your home remains airtight.

Step 3: Finding the Right Storage Spot

Location is everything. You want a dry, climate-controlled area like a basement, utility closet, or an insulated attic. Avoid storing units in unheated garages or sheds where rodents might find the insulation attractive.

Extreme cold can affect sensitive electronics and seals over time. Understanding how weather patterns affect HVAC performance helps you realize that protection from the elements is the best way to extend the life of any cooling equipment.

Step 4: Protect the Unit During Storage

Once the unit is in its storage spot, cover it with a breathable material. A heavy-duty plastic bag can trap moisture, which leads to corrosion. A dedicated AC cover or even an old bedsheet works best.

  • Keep the unit upright at all times to prevent oil from migrating out of the compressor.
  • Store it on a shelf or pallet to keep it off the floor.
  • Ensure nothing is stacked on top of the fins or the outer casing.

If you find that your unit is leaking or has internal damage during this process, you may need professional help. Homeowners can find trusted HVAC contractors on HVACDatabase.com to handle repairs or seasonal maintenance.

Thinking Ahead to Next Season

Proper storage is just one part of a healthy home maintenance routine. As you put your cooling units away, you should also consider how to prepare your HVAC system for summer in advance to avoid the rush.

If your window unit requires a drainage solution for the upcoming year, look into how to install a condensate neutralizer kit if you are transitioning to more permanent split systems.

Conclusion

Taking thirty minutes to properly store your window AC unit saves you money on energy bills and prevents the need for an early replacement. By keeping the unit clean, dry, and upright, you ensure it is ready to tackle the heat next year.

For all other heating and cooling needs, HVACDatabase.com is your go-to resource for connecting with local, vetted professionals who can keep your home comfortable year-round.