Cleaning your AC filter is a simple DIY task that can help your system run more efficiently and reduce strain on the unit. Even in shorter Minneapolis summers, dust buildup happens fast, and proactive maintenance improves airflow.

Learn how to replace and clean your AC filter safely.

Why a Clean AC Filter Matters

A dirty filter blocks airflow, makes the system work harder, and can lead to higher energy bills. Clean AC filters help reduce dander and allergens in the home, making it easier for those with sensitivities and asthma to breathe.

What You’ll Need

Filter cleaning is an important step in your AC’s ongoing maintenance. Here’s what you’ll need.

• Vacuum with brush attachment
• Warm water
• Mild soap
• A bucket or sink that can hold the filter
• Clean towel
• Screwdriver (if needed)

Not all filters are washable, so check the filter type first.

Step 1: Turn Off Your AC

The AC should be turned off before removing the filter. This isn’t necessarily a safety issue, and you should always follow the manufacturer's recommendations. The problem is that leaving your AC without a filter, even for a few minutes, may allow debris to enter the evaporator coil. This could lead to emergency AC repair.

Step 2: Find and Remove the AC Filter

Filters are commonly located behind the return vent, inside the air handler, or in a front panel. The exact location varies by system type, but you can always search online for “[AC model filter location]” to find a video that identifies your filter location.

Remove the filter gently so dust does not scatter.

Step 3: Check Whether the AC Filter is Washable

Disposable filters are to be thrown out and replaced. Reusable filters can be cleaned, carefully dried, and placed back in your AC. They’re often labeled as reusable or disposable on the filter itself.

Damaged or torn filters must be replaced, regardless of whether they’re reusable.

Step 4: Clean the Filter

For reusable filters, there are two main cleaning methods: vacuum, then soak in lukewarm water with mild soap, or vacuum, then run the filter through your dishwasher. The exact method depends on the type of filter, so verify whether your filter is dishwasher-safe. If you’re washing by hand, you’ll need to scrub the filter and let it soak in the soap for at least 30 minutes.

Avoid harsh chemicals, very hot water, and high pressure.

Step 5: Let It Dry Fully

The filter must dry completely before reinstalling. This avoids mold growth. We recommend air-drying on a clean towel in a safe location, away from curious pets. Let the filter dry for at least an hour past when you think it’s bone dry, just to be safe.

Step 6: Reinstall and Reset

Both disposable and reusable filters have an arrow on the frame. This arrow helps you place the filter back in the correct direction. The arrow must match the airflow direction, pointing toward the HVAC.

Install correctly, close the grate back up if necessary, and turn the system back on to check that airflow feels normal. If you’re confused about airflow and filter reinstallation, then call for an AC tune-up. The professionals can quickly help.

How Often Should You Clean Your AC Filter

Clear your filter every 1-3 months, depending on use, pets, dust, and indoor air quality needs. For Minneapolis homeowners, AC maintenance occurs more frequently during heavy summer use.

When To Replace Your AC Filter

Beyond visible damage, some filters may have other issues that stop you from reusing them. Problems like odor, heavy grime, or a filter that still looks dirty after cleaning indicate it’s time for a replacement.

When To Call an HVAC Professional for Your AC

Challenges like poor airflow, repeated filter clogging, weak cooling, or unusual odors can signal a larger AC issue that requires calling for AC technicians in Minneapolis. Total Comfort is the premier HVAC company in Minneapolis. From Lake Minnetonka to South Minneapolis, we can inspect the system, address airflow issues, and handle maintenance.

Reach out for seasonal AC maintenance, an inspection, or even AC repair in the Twin Cities.