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Keeping your portable air conditioner clean is one of the simplest ways to improve performance and extend its lifespan.
In this guide, I’ll walk you through how to clean the filters, coils, and casing—plus share a few tips to keep dust and debris from building up again. A well-maintained unit doesn’t just cool better—it lasts longer and runs more efficiently.
Key takeaways
Easy steps for cleaning any portable air conditioner
Gather necessary items for cleaning
To clean your portable air conditioning unit, you will need common household items and tools, such as:
Unplug your AC
Safety comes first, so before thorough cleaning, unplug your air conditioner.
Drain the water tank
If you don't own an auto-evaporative AC or your AC isn't drained through a hose, drain the condensate water tank before you proceed.
The drain plug is usually located on the bottom backside of your AC.
Once located, remove the plug and drain your AC into a floor drain, in your yard, or into a bucket.
Feel free to wipe-dry the drain with a towel once you finish.
Dry out the unit
To ensure any residue moisture is removed, run your AC unit on fan mode for one to two hours, depending on the size of the unit.
After drying the portable AC out, unplug it once again.
Remove and clean the air filters
Pop off the lid from your portable air conditioner to access the filters, and take them out.
With many types, including HEPA and carbon filters, you will be able to shake loose or blow out (preferably with canned air dusters) any dust build-up.
Some portable AC units also have washable filters, if the manual says so, feel free to clean the filter with a solution of detergent and warm water to remove any additional residue.
If there's a pre-filter in your AC, clean it the same way.
In the end, dry out the clean filters thoroughly for 30 to 60 minutes.
Vacuum or blow out the dust
Use a screwdriver to open up your unit from the back and clean the intake valves and fins on the evaporator and condenser.
Use the hose attachments on a vacuum cleaner or a handheld vacuum to remove dust build-up from the inside components.
ACLAB notes:
If you don't want to vacuum and you have a yard, using a garden hose to spray your portable AC clean is perfectly safe and efficient.
Clean the AC coils
Clean the grease, dust, or other dirt from the cooling coils with an acidic cleaner. Instead of using a detergent, a dedicated coil cleaner is available to buy.
If you prefer the DIY route - white vinegar and water solution make an effective acidic cleaner.
ACLAB notes:
To combat the vinegar smell, add a shot of lemon juice to your DIY cleaning solution.
Wipe down the outside
Use a non-abrasive cloth, or a soft towel to wipe the exterior of your AC.
For better results, mix water and mild detergent, dampen the soft cloth with it and wipe the unit clean.
Reassemble the AC
Put all parts as you found them once you have finished cleaning and the filters have dried.
If there were screws, screw them back in, without overly tightening them.
Test for 10 minutes
When reassembled, run your portable AC for ten minutes in cooling mode to test if it works before installing it in its usual place.
ACLAB note:
If you are in search for a new AC, read my comprehensive portable AC and window AC buying guides.
Two easy ways to drain a portable AC
Draining a portable AC into yhe floor drain
Draining a portable AC in the floor drain is the fastest and most effective way to remove all the water from the unit.
Simply roll your portable AC into the bathroom (or any other place with a floor drain), remove the drain plug, and let the water run out.
Draining a portable AC into a container
To drain a portable AC into a container, first find a chair, table, or just a sturdy box and place your portable AC on top of it.
Then, place the container (a bucket, plastic tub, or something similar) underneath the drain.
Finally, remove the drain plug and let the water slowly drain.
ACLAB Note:
Do not tilt your portable AC during draining. Tilting the AC could result in the unit falling over and breaking.
Cleaning a portable air conditioning unit: By brand
To ensure cleaning the AC goes smoothly, follow the guide provided by your model’s manufacturer before cleaning or removing any part of your portable air conditioner.
LG Portable AC: See LGs troubleshooting guide
DeLonghi portable AC: Check out DeLonghi's instruction manuals
Danby portable AC: Read Danby product's resources
Frigidaire AC: Examine Frigidaire's product support section
Hisense AC: Look through Hisense's air product section
Honeywell portable AC: Dive into Honeywell's cleaning tutorial
Why is cleaning your portable AC unit important?
Keeping your portable air conditioning unit clean is about more than just appearances. Cleaning is important because it:
Related article: Learn about portable AC running costs and energy use
ACLAB note:
Regularly cleaning your portable AC regularly can improve its overall cooling and energy efficiency. It can also improves its longevity and keep the air healthy and safe from microbes.
HVAC expert tips: Storing a portable AC correctly
Here's how to properly store your portable AC unit during winter or when you're not using it:
Related article: Can you lay a portable AC on its side?
ACLAB Note:
If kept in a humid basement, place your portable AC in a large vacuum storage bag (or the original box) to prevent any humidity-induced damage.
FAQs
Can you refill a portable air conditioner?
You cannot refill a portable air conditioner unless it is a swamp cooler which uses water instead of refrigerants to cool down the air.
Do portable air conditioners use a lot of electricity?
Portable air conditioners don't use a lot of electricity compared to central ACs. However, a portable AC can consume up to 4.4 kWh, which, depending on your living conditions, could be up to $200 a month in electricity cost.
What are some causes of smelly portable AC units?
The main cause of a smelly portable air conditioner is a build-up of mold, mildew, or dust in the unit.
Do all portable air conditioners have to be vented out a window?
Most portable air conditioner units will need to be vented out a window via an exhaust hose.
Related article: Venting options for portable air conditioners
Is a portable AC better than a window unit?
Depending on your home, a portable AC may be a better option for you than a window unit, especially if you're renting or you aren't allowed to install a window AC.
Related article: Portable air conditioners versus window air conditioners
Can you leave a portable air conditioner on all day?
You can safely leave your portable air conditioner on all day, but you probably shouldn't. If you can't efficiently cool down your space in a matter of hours, you probably need to look for a higher BTU (British Thermal Units) capacity unit.
