- How do you clean AC coils?
- How much does it cost to clean AC coils?
- How do you change an AC filter?
- How do you clean an AC condenser coil?
- How often should you change your AC filter?
- How do you clean an AC evaporator coil?
- How do you clean leaves and debris out of your AC unit?
- What size AC return filter do I need?
- How do you clean mold from a central AC unit?
- What is an AC tune up?
- Can you use muriatic acid to clean AC coils?
- Is yearly AC maintenance worth it?
How do you clean AC coils?
To clean AC coils, turn off power at the thermostat and the outdoor disconnect, then gently rinse the outdoor condenser coil from the inside out with a garden hose. Use a coil cleaner made for AC coils if the buildup is heavy, and never use a pressure washer, which bends the fins.
Remove the top grille only if you can do so safely, and let the cleaner soak as directed. The indoor evaporator coil is behind a sealed panel and is best cleaned by a technician. Bent fins can be combed straight with a fin comb. If you are unsure at any step, have a pro do it.
How much does it cost to clean AC coils?
The cost to clean AC coils depends on which coil needs cleaning, how dirty it is, how easy it is to reach, and whether it is part of a full tune up. An outdoor condenser coil is the easier job, while an indoor evaporator coil may require opening the air handler.
Pulling the coil takes more time, and heavy dust, cottonwood or cat hair buildup adds labor. Cleaning is often included in a maintenance visit, so ask what the tune up covers before paying for it separately. A clean coil lets the system cool better and use less electricity, which is why it matters in Arizona.
How do you change an AC filter?
To change an AC filter, turn the system off, find the filter slot at the return grille or at the air handler, and slide the old filter out. Insert the new filter with the arrow on its frame pointing toward the air handler, away from the room, then close the grille.
The arrow shows airflow direction. Check the size printed on the old filter edge and buy the same size. Do not run the system without a filter. Write the date on the frame so you remember when it was changed. If you cannot find the filter, or the slot is damaged, have a technician show you.
How do you clean an AC condenser coil?
To clean an AC condenser coil, shut off the power at the thermostat and the disconnect near the unit, clear leaves and debris from around the cabinet, and rinse the coil with a gentle spray of water from the inside out when possible. Let the unit dry before restoring power.
A foaming coil cleaner made for outdoor condensers can break up greasy dirt. Rinse thoroughly and avoid high pressure, which flattens the delicate aluminum fins. Do not reach into the unit or remove electrical panels. If the coil is packed with dirt or the fins are damaged, a technician can clean it properly. In dusty West Valley neighborhoods this is often needed each year.
How often should you change your AC filter?
You should change your AC filter about every one to three months, and check it monthly, depending on the type of filter, the home and the season. In Arizona the AC runs for much of the year and dust is constant, so filters load up faster than in mild climates.
Homes with pets, allergies, construction nearby or a lot of foot traffic need more frequent changes. Thicker pleated filters may last longer than thin fiberglass ones, but always follow the maker's guidance. A clogged filter makes the system work harder, reduces cooling and can cause a frozen coil, so when in doubt, change it.
How do you clean an AC evaporator coil?
An AC evaporator coil sits inside the air handler or above the furnace, behind a sealed panel, and cleaning it is usually best left to a technician. The job requires turning off power, opening panels, and using a cleaner made for evaporator coils.
The drain pan and line must also be clear so the rinse water flows out. Done wrong, it can leave water in the wrong place or damage the fins. Signs the coil needs attention include weak airflow, ice on the coil, a musty smell, and poor cooling. Changing your filter regularly reduces how often the coil gets dirty, so keep up with it.
How do you clean leaves and debris out of your AC unit?
To clean leaves and debris out of your AC unit, switch off power at the thermostat and the outdoor disconnect, then remove leaves, dirt and cottonwood by hand around the outside of the cabinet. Trim plants so there is a couple of feet of clearance around the unit.
Gently rinse the coil with a hose if needed. For debris inside the cabinet, avoid reaching in near the fan and electrical parts, and have a technician remove the top and clean it out. Dust storms and monsoon winds can pack debris into the fins quickly in the West Valley. Keeping the area clear helps the unit run more efficiently.
What size AC return filter do I need?
The AC return filter size you need is the same size as the filter now installed. The size is printed on the edge of the frame, listed as length by width by thickness in inches, such as 20 by 25 by 1. Measure the filter slot if the old filter has no label.
The tonnage of the unit, like 2.5 ton, does not tell you the filter size, because the return grille or filter slot determines it. Buying the wrong size lets air bypass the filter, and dust gets into the coil. If your system has more than one return, each may take a different size, so check them all.
How do you clean mold from a central AC unit?
To clean mold from a central AC unit, call a professional, because disturbing mold inside the air handler, coil or ducts can spread spores through the house. Visible mold on vent covers can be wiped clean by you after the system is off.
Musty smells, black spots near the drain pan, or water stains point to moisture problems like a clogged condensate drain or a leak. A technician can clean the coil and drain pan, clear the drain line and fix the source of moisture, which is what keeps mold from coming back. In the dry desert mold is less common than in humid areas, but drain problems still cause it.
What is an AC tune up?
An AC tune up is a preventive service visit where a technician inspects and cleans the system and checks that it is working properly before it fails. It normally covers the thermostat, filter and airflow, coils and drain, capacitor, contactor and motors, and electrical connections.
The technician also measures temperature drop and operation, then can point out worn parts before the summer peak. Ask exactly what the visit includes, since scope varies by company. Doing it before the hot season is the best timing in Arizona.
Can you use muriatic acid to clean AC coils?
No, you should not use muriatic acid to clean AC coils. It is harsh, can corrode the aluminum fins and copper tubing, can cause refrigerant leaks, and is dangerous to your skin, eyes and lungs. It can also damage nearby surfaces and plants.
Use a coil cleaner made for AC coils that is labeled for the type of coil you have, follow the directions, and rinse thoroughly. A technician has the proper cleaners and can judge how dirty the coil really is. Never mix chemicals, and shut off power before cleaning anything on the unit.
Is yearly AC maintenance worth it?
Yes, for most Arizona homes yearly AC maintenance is worth it. The system runs for much of the year, in heat that stresses every part, so small problems like a weak capacitor, dirty coil or clogged drain can become breakdowns on the hottest days.
A yearly visit catches them early, keeps the system running efficiently and helps it last longer. It does not prevent every failure, and older units still wear out. If you skip professional service, at least change the filter regularly and keep the outdoor unit clear. Many homeowners schedule maintenance in spring before the heat arrives.