The dust bunnies surrounding dirty air conditioning/heat vent covers not only call attention to no-dusting zones, they also tell the world that you haven’t been changing the filters enough.
But getting rid of those tattle tales is easy!
All you have to do is regularly maintain the vents — the small ones and the main intake vent.
Green cleaning coach Leslie Reichert offers simple steps that will not only keep vents looking great, but also reduce allergens and increase the efficiency of your A/C and heating unit at the same time.
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Monthly
- Change the filter
“If you pick a standing date to change your filter, say the first of every month, it will be easy to remember,” Reichert told TODAY Home. “If not, write on the filter the date you changed it. That way, nothing’s left to guesswork.”
- Clean the vents
Before cleaning vents, turn off the heat or A/C. If ceiling vents are particularly dirty, protect furniture by covering the area below the vent with a sheet. “You also may want to wear a baseball cap to keep falling dust out of your eyes and hair,” she added.
Next, vacuum vents using a dusting brush attachment or a microfiber extendable duster. Don’t have either? Simply wipe with a dry microfiber cloth or a slightly damp Mr. Clean Magic Eraser.
“Do not use water or other cleaning products because they can easily smear the dust onto the walls or ceilings and you’ll end up with an even bigger mess,” Reichert warned.
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Before cleaning vent covers, turn off the heat or A/C.
Remove the smaller vent covers by unscrewing each corner. The covers will probably be full of dust on the inside and the outside. To clean, place the covers in a sink filled with hot, soapy water and wash with a microfiber cloth.
“Use just a small amount of dish detergent,” Reichert advised. “And don’t soak vent covers too long or rub too hard as the paint could come off. Then you’ll have a much bigger project on your hands.”
Some of the dirt may be oily, depending on the type of heat you have in your house, if you burn lots of candles or if the vent is in the kitchen. “Cut through oily residue with rubbing alcohol. Just remember to rub lightly so you don’t damage the paint.”
Because of its size, you may have to clean the larger intake cover outside or in the bathtub. “Just follow the same directions,” said Reichert.
One last point: Make sure the covers are completely dry before re-installing them, otherwise dust particles will cling to the vent slats.
“A final light wipe with a microfiber cloth will remove water spots and have vent covers looking perfect,” Reichert said.
It's important to clean your air conditioner to maintain good air quality in your home. Filters inside air conditioners are designed to catch dust (and sometimes other pollutants such as pollen and bacteria), but if not cleaned regularly they can clog up and collect moisture and even mould.
Regularly cleaning your air conditioner will also mean better energy efficiency and lower running costs. The more clogged the dust filters and the interior of the machine, the harder it has to work to move the air, as well as cool or heat.
The following advice is based on split-system air conditioners (the most common type in Australian homes) but it broadly applies to ducted and wall-window models too.
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Check the instructions
Your air conditioner should have come with an instruction manual that details how to access and clean the air filters and any other user-maintainable parts. If you don't have the book any more, you may be able to download a copy from the manufacturer's website.
Need to know: Make sure the unit is turned off at the wall before you do any maintenance on it.
Video: CHOICE expert Chris Barnes shows you how to clean the filters on your air conditioner to keep it running at its best.
How to clean the filters and louvres on your air conditioner
Clean the indoor unit dust filters
The indoor air conditioner unit has dust filters that need regular cleaning. The more clogged the filter, the harder the air conditioner has to work to push air through it. That can mean higher running costs.
It's usually a simple matter of popping open the plastic cover and removing the filter (there may be more than one). If you can't easily reach the indoor unit, use a small stepladder.
Manufacturers usually recommend that you clean the dust filters every few weeks, but it really depends how often you use your air conditioner. Simply put, the more you use it, the more often you should clean the filters. At the least, aim to clean them a couple of times a year. For example, if you mainly use the unit in summer, clean the filters in spring so it's ready for the peak season, and again when the hot season is over.
- Take the dust filters outside for a good brush or shake. They can usually also be vacuumed for a thorough clean – use the vacuum cleaner's dusting brush head if you have one.
- If the dust filters are very dirty and grimy, you can wash them in warm water with some mild detergent and rinse them clean. Make sure they are completely dry before putting them back in the unit.
- If the filters are damaged, replace them with new ones (check the manual or the manufacturer's website for where to get spare parts).
Some models also have an air purification filter (such as an ionising filter) that can be removed and cleaned. This type of filter will eventually need to be replaced, perhaps every year or two, depending on usage. Check the instructions for how to clean or replace this filter.
How to clean your air conditioner's louvres
You may also be able to remove the indoor unit's louvres (the oscillating blades that direct the air flow). Give them, and the space behind them inside the unit, a thorough clean with a dry cloth or with the vacuum cleaner. Again, make sure the air conditioner unit is powered off before you do this.
In dusty or humid areas
If you live in a very dusty or humid environment, and use your air conditioner frequently, you might be surprised at how much dust and mould can build up inside the air conditioner. This can lead not only to the unit losing performance as it clogs up, but also to mould spores growing and being blown into your home, as well as water leakage if the indoor unit's drainage pipe gets blocked by gunk.
Regular cleaning of the dust filters and louvres will help avoid this. Running the unit in fan-only mode (or running a 'dry out' program if the unit has one) will help keep the interior of the indoor unit dry. Nevertheless, an occasional professional service and clean may be a good idea.
Read more: How much does an air conditioner cost to install or replace?
How to clean your air conditioner's outdoor unit
Keep the outdoor compressor unit clear of surrounding grass and plants, and brush away dust, leaves and cobwebs regularly.
Running a vacuum cleaner over the air intake can help clear dust from inside.
We don't recommend that you open up the unit to clean its internal components – leave that to a professional service.
Getting your air conditioner professionally serviced and cleaned
Your air conditioning system should be professionally serviced regularly – the service person will check the refrigerant gas levels, test the thermostat and make sure all the internals are in good condition. This will keep the unit running for many years.
Some manufacturers recommend the air conditioner should be serviced once a year. Others say that as long as you follow the instructions and regularly clean the filters and units, you'll only need to have the air conditioner serviced if a fault develops.
We asked CHOICE members about their air conditioner cleaning habits. Most said they clean the filters a few times each year, but only call for a service every few years or when the unit develops a fault. If in doubt, check the manual for your model or call the manufacturer for their advice.
Professional cleaning
You can have your air conditioner cleaned by a professional. A maintenance service should include cleaning of internal components such as coils, fins and drainage. This is especially worth considering if you live in a very dusty or humid area, where dust and mould build-up inside the unit is a risk.
Read more: How to fix and maintain your own air conditioner
Air conditioner cleaning cheat sheet
Every month
- If you use the air conditioner regularly, run the air conditioner in fan-only mode occasionally to evaporate any moisture inside the indoor unit, which helps prevent mould and odours.
Bi-annually
- Clean the dust filter screens in the indoor unit of a split-system air conditioner, or as per the instructions for your ducted system. Do this more often if your air conditioner is always on, you live in a very dusty environment, or you experience a noticeable drop in performance.
- Clean any extra filters, such air purifying filters, as per the instructions.
- Wipe down the indoor unit or any ducts or vents with a soft damp cloth, both inside the unit (as far as you can safely reach) and the exterior.
Annually
- Clean the outdoor unit with a soft brush or broom, and remove vegetation, obstructions, spider webs etc. as necessary.
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