Do I Need a Pro for Air Duct Filter Replacement?

You don’t usually need a professional for air duct filter replacement. Although it may be different than replacing an air handler or window AC filter, it’s just as important. And, the process takes just a few minutes. Regular air filter replacement can reduce energy bills, improve indoor air quality, and extend the life of your HVAC system. If you’re unfamiliar with this task, we’ll explain how it works.

How to Replace a Return Air Duct Filter

A filter may be located in the return air vent or somewhere in the return duct. It ensures the air drawn from rooms is free of particulates by the time it reaches your furnace or air handler. Fortunately, replacing it isn’t complicated and does not require a professional. Follow these steps to remove the old air filter and install a new one:

1. Turn off your HVAC unit to prevent dust and dirt from contaminating the system.
2. Open the vent (to access a filter installed near the return vent).
3. Unhook the latch to release the drawer housing the filter (if the filter is inside the duct).
4. Remove the old filter from the frame and discard it.
5. Note the size of the filter on the side.
6. If the size isn’t listed, measure the filter carefully or consult your HVAC system’s owner’s manual.

Once you have the new filter, insert it into the same location as the old one. Its arrow must point in the direction of the airflow (or toward the furnace). With the filter in place, close the drawer and secure the latch.

However, before you install the filter, it’s a good idea to wipe the area with a microfiber cloth. Otherwise, dirt can blow into the system or clog up the new filter. To remove dust between the grill slats, you can wrap the cloth around the tip of a flathead screwdriver. Gently move the screwdriver along each slat to clean it. You can also use a brush attachment to vacuum the cover.

In addition to replacing the return air duct filter, filters in the air handler cabinet, furnace, and other parts of your HVAC system should be properly maintained.

When to Change Your Air Filter

Some air filters are rated for 30 days and others for 90 days. Media filters are thicker and, depending on the type, can last six to 12 months. Replace the filter as suggested by the manufacturer. You can write the date on your calendar when the filter was installed. Setting an alert on your phone can also remind you when to change it. 

However, air duct filter replacement can be performed sooner than suggested if you notice any of the following issues:

• A Lack of Air Circulation: The filter may be clogged, restricting the amount of airflow in your home. This also affects temperature control and distribution.
• Air Conditioner Leakage: The flow of warm air into the system is restricted, preventing the evaporator coil from absorbing heat. It can then freeze; as the ice thaws, water can leak from your AC system into your home.
• Rising Energy Bills: A clogged filter forces the blower fan and other components to work harder, increasing energy consumption. As a result, your electric bills go up.

A central air conditioning system is designed to work with a certain amount of air. Blocked airflow causes components to work harder to compensate. This accelerates wear and tear, so major repairs become more common and your heating and cooling system can fail sooner than expected.

Reasons to Hire a Contractor for Air Duct Filter Replacement

Most people can replace an air duct filter on their own. However, you may consider hiring a local HVAC contractor in some circumstances. These are a few reasons to call a professional and schedule service:

• Frozen Evaporator Coil: The coil can freeze for a few reasons, including low refrigerant, and ice can easily damage it. A technician can thoroughly inspect and test the system to determine why the evaporator coil keeps freezing and if it needs to be repaired or replaced.
• Utility Bills Are Still High: If your energy bill remains high or continues to increase even with regular filter replacements, call for help. Numerous HVAC issues can cause decreased energy efficiency. This is often the first sign of a developing problem.
• It’s Time for Maintenance: We recommend maintenance at least annually; however, your AC should be checked in the spring and furnace in the fall. If your system is due for maintenance and it’s time for air duct filter replacement, request an appointment so a technician can help you.
• Sizing a New Filter: While a Manual J calculation determines the right-sized AC or heater, a Manual D calculation helps size ductwork and can help in selecting a larger filter. Choosing the ideal filter can optimize airflow and system performance. However, the system may also need improvements, such as a larger plenum box.
• You Have a Commercial HVAC System: Commercial HVAC systems use different sizes and types of filters than residential units. Replacing them can be challenging. These filters are often held in place by special brackets and a gasket. Therefore, air duct filter replacement requires knowledge of these components to ensure air is filtered properly and the system works as designed.

Replacing a Duct Filter: DIY vs. Hiring a Pro

If your home has an air duct filter, you can most often replace it yourself. There’s no need for a professional unless it’s time for maintenance or you suspect an HVAC system issue. You can also call a pro if you’re considering a larger, more efficient filter. They can help choose the appropriate type and model, and determine if other updates are needed. A professional should always replace air duct filters in a commercial HVAC system.

Contact Trio Heating & Air

An HVAC filter must be replaced regularly. Neglecting to change one (and poor maintenance in general) can reduce efficiency, performance, and indoor air quality. Our licensed contractors can help with air duct filter replacement, air duct cleaning, and other indoor air quality services. We provide a customized approach for each home and find effective, high-efficiency solutions. To request service, book an appointment online or call (415) 223-5096.