Air Conditioner Filters: Essential Maintenance & Replacement Tips 

Jun 13, 2025 | A/C, AC, Air Conditioner, Air Quality, Airflow, Cooling, Energy Efficiency, Filter, How-to, Maintenance

Maintaining a comfortable and healthy home environment largely depends on the efficient function of your air conditioner. Unfortunately, many homeowners overlook the simple yet crucial task of cleaning the air conditioner filter.  

At Delaware Heating & Air, we know the value of clean air and effective AC performance. Let’s take a look at why keeping your air conditioner filter clean is important for both your health and your budget, and how you can do it yourself. 

Why Keeping Your Air Conditioner Filter Clean is Essential 

Don’t wait until your system is struggling—air filters should be changed about every 30–60 days. That frequency can vary depending on how many people and pets live in your home, or if anyone has allergies. Check out the EPA’s Guide to Air Cleaners for pro tips on cleaner indoor air. 

Clean air filters help with the following: 

1. Improved Air Quality 

An air conditioner filter’s main job is to capture dust, pollen, and other airborne particles. Over time, these accumulations can reduce the filter’s effectiveness. When a filter is dirty, it may allow pollutants to re-enter your home, potentially aggravating allergies and respiratory problems. 

2. Increased Energy Efficiency 

A clogged air conditioner filter forces the system to work harder to circulate air throughout your home. This extra effort means more energy consumption, which results in higher utility bills. A clean filter ensures smooth airflow, enhancing energy efficiency and lowering costs. 

3. Extended Lifespan of Your AC Unit 

An AC system that is overworked tends to experience more wear and tear, which can lead to costly repairs or even the need for a premature replacement. Regular maintenance and cleaning of the AC filter help sustain optimal performance, effectively extending the unit’s lifespan. 

4. More Effective Cooling 

A clean filter promotes free and even airflow, enabling your AC to cool your home more efficiently. This results in a consistently comfortable indoor environment, especially during the hot summer season. 

Step-by-Step Guide to Cleaning Your Air Conditioner Filter 

1. Turn Off Your AC 

Before starting the cleaning process, ensure your safety by turning off the power to your air conditioning unit. This can usually be done via the switch on the AC unit itself or at the circuit breaker. 

2. Locate and Remove the Filter 

You’ll typically find the air conditioner filter behind the front panel or inside the air handler unit. Carefully remove the panel and slide out the filter. If you need help locating it, check the AC instruction manual or reach out to Delaware Heating & Air for guidance. 

3. Assess the Filter 

After removing the filter, check to see if it needs cleaning or replacing. If the filter is disposable and looks worn out, it might be time to replace it. Reusable filters, however, can be cleaned and reused several times before needing replacement. 

4. Clean the Filter 

For reusable filters, follow these simple steps: 

– Use a vacuum cleaner with a soft brush attachment to remove loose dirt and debris from both sides. 

– Soak the filter in a mixture of warm water and mild dish soap. Gently scrub with a soft brush to remove any remaining dirt. Avoid harsh chemicals or high-pressure water that might damage the filter. 

– Rinse thoroughly with clean water and let the filter air dry completely. Ensure it’s fully dry before reinserting it to prevent mold growth. 

5. Reinstall the Filter 

Once the filter is clean and dry, slide it back into its position and secure any panels or covers. Turn the power back on and make sure your air conditioner is running smoothly. 

How Often Should You Clean Your Air Conditioner Filter? 

As mentioned above, the frequency of cleaning or replacing your air conditioner filter depends on several factors. Here’s a deeper look into it: 

– Usage: During high usage periods like summer, consider cleaning or changing your filter every month. 

– Air Quality: If you live in a dusty or pollen-heavy area, more frequent maintenance may be necessary. 

– Household Size: Larger households or those with pets may need to clean or change filters more frequently due to increased particle buildup. 

How to Change Your Disposable Air Conditioner Air Filter 
If you use disposable air filters, over time, these filters collect particles that can restrict airflow and reduce system performance. Stay proactive by changing it every 30–60 days. It’s a small step that makes a big impact. Here’s a step-by-step guide to changing out your disposable HVAC air filters. 

Taking the time to regularly clean your air conditioner filter is crucial for maintaining a healthy and efficient home. By following these simple steps, you can ensure your AC unit operates effectively, delivering cleaner air, lower energy bills, and a longer-lasting system. 

Delaware Heating & Air is dedicated to helping you maintain a comfortable and efficient home environment. If you need professional assistance or further advice, don’t hesitate to reach out to our team. Prioritize your air quality and energy efficiency by keeping your air conditioner filter clean! 

You can call Delaware Heating & Air today at (740) 227-8302, or schedule a heating or cooling repair appointment online now by clicking here