When summer is over and the hot weather fades, most people roll their portable air conditioner into a corner or closet without thinking much about it. The problem is, if it isn’t stored the right way, the unit can develop mould, bad smells, or even damage that makes it less effective next year.

The good news is that storing a portable air conditioner properly is quick and easy. By draining the water, cleaning and drying the parts, and keeping it in the right spot, you’ll make sure it lasts longer and works like new when the heat comes back. In this guide, we’ll show you step by step how to store your AC safely so it’s ready to go for next summer.

Step 1: Power Down and Disconnect Safely

• Turn off the unit and unplug it: Always power down before touching hoses, drains, or filters.
• Wrap the power cord: Coil it loosely and secure it with a hook and loop strap or twist tie to prevent bending or fraying.

Tip: Never store the AC with the cord under tension, it weakens insulation and risks short circuits.

Step 2: Drain All Water from the Unit

Moisture left inside is the main culprit behind mould and foul odours.

Steps to drain properly:

1. Locate the drain plug or reservoir.
2. Use a shallow pan or container to collect water from the drain port.
3. Remove and empty the drip tray if your unit has one.
4. Run the fan-only mode for 30–60 minutes to flush out hidden moisture.

Step 3: Clean and Dry Before Storage

A clean AC is less likely to harbour dust, mould, or bacteria during storage.

• Remove and wash filters: Use mild soap and warm water, then allow them to dry completely.
• Vacuum the coils and vents: Use a soft brush or a coil cleaner for deeper cleaning.
• Wipe down the exterior: A damp microfibre cloth works well to remove dust and prevent staining.

Step 4: Remove and Organise Accessories

Most portable ACs come with multiple parts that are easy to misplace.

• Detach the hose, window kit, and seals. Wipe them clean and let them dry.
• Store screws and small pieces in a labelled zip-lock bag.
• Store accessories in the same box or container as the unit for hassle-free setup next season.

Step 5: Ensure the Unit Is Completely Dry

Even tiny amounts of trapped water can lead to mould or corrosion.

• Air the unit for 24–48 hours: Keep it in a warm, ventilated space before packing.
• Check crevices and the drain area for lingering dampness.

Step 6: Choose the Best Storage Location

Where you store your portable AC matters as much as how you store it.

Best storage spaces:

• Climate-controlled closets
• Insulated basements
• Utility rooms

Avoid:

• Unheated garages or sheds (risk of freezing and cracking)
• Damp areas (mould and rust)
• Outdoor spaces (UV damage and pests)

Always store the unit upright to protect the compressor.

Step 7: Protect the Unit During Storage

• Use the original box if available: Designed to fit and protect your unit.
• Breathable cover alternatives: A fabric sheet or tarp prevents dust without trapping moisture.
• Keep it elevated: Store on a small platform to protect from flooding or damp floors.

Step 8: Care for the Remote and Batteries

• Remove batteries to avoid acid leakage and corrosion.
• Keep the remote nearby: Store it with the accessories bag to avoid hunting for it next summer.

Step 9: Add Extra Protection in Humid Areas

If you live in a damp climate:

• Place moisture absorbers (like silica gel or DampRid) inside the storage area.
• Use a small dehumidifier if your basement tends to stay damp.
• Inspect regularly for rust or pest activity.

Space-Saving Storage Tips

For apartments or condos with limited space:

• Slide the unit into a closet beside seasonal items.
• Use vertical space, Stack lightweight storage bins above it (never heavy boxes).
• Avoid blocking airflow, Allow at least a small gap for air circulation.

Seasonal Maintenance and Mid-Winter Checks

Even while in storage, your portable AC may benefit from occasional checks.

• Inspect covers and cords: Ensure no pests, cracks, or moisture buildup.
• Check accessories: Make sure seals and hoses aren’t brittle or damaged.

Common issues Caused by Poor Storage Include:

• Mould and mildew growth due to leftover moisture.
• Leaks from improperly drained tanks or trays.
• Compressor damage if stored sideways or in freezing conditions.
• Electrical hazards caused by cord or battery corrosion.

With a little preparation, you can avoid these problems entirely.

Storing a portable Air Conditioner properly takes just a little extra effort, but it pays off in:

• Improved efficiency when you need it next summer.
• Longer lifespan for your appliance.
• Cleaner air quality with fewer odours and mould issues.

By draining, cleaning, drying, and storing your portable AC the right way, you’ll enjoy cool comfort season after season, without costly repairs or replacements.

FAQs

1. Do portable air conditioners need to be stored upright?

A portable air conditioner should always be stored upright. Placing it on its side or upside down can damage the compressor and internal parts, and if left that way for too long, the unit may become permanently unusable.

2. Is it okay to leave water in the tank if I’m storing the unit for winter?

No, all water must be drained. Even a small amount can lead to mould, foul smells, and corrosion.

3. Is it safe to use a plastic storage bag to cover my AC?

Avoid sealed plastic bags because they trap moisture and encourage mould. Instead, use a breathable fabric cover or the original box.