Why Is Changing Furnace Filters So Important?

A furnace filter is a small but highly important part of your home’s heating system. Replacing it regularly doesn’t just contribute to better air quality but also improves furnace efficiency and prevents damage.

When the filter gets clogged, you may not feel the difference immediately. However, with time, you could face expensive furnace repair. Changing the furnace filter regularly can improve your home maintenance routine. For many homeowners, it can be a DIY job.

Turning Off the Furnace and Ensuring Safety

Before handling the filter, turn off the furnace and thermostat to prevent the system from running while you work. If your furnace has a power switch, shut it off as well. It will keep the dust from circulating and reduce the possibility of system damage during replacement.

Removing the Old Filter

Carefully slide out the old filter and inspect it. If you can’t see the light through the filter, it’s time to replace it. Take note of the airflow arrow on it. It should be pointing toward the blow motor. Make sure to install the new filter in the same direction.

Installing the New Filter 

Insert the new filter into the slot. Check that it follows the airflow direction marked on the frame. Improper installation can reduce the filtering quality and damage the system. Double-check that the filter fits securely. It shouldn’t bend or shift when you slide it into place.

Restarting the Furnace

Once the new filter is installed, turn the furnace back on. Listen carefully to the way it operates. If you hear any unusual sounds, you may have done something wrong. Stop the furnace and check the filer’s installation. If it seems properly installed but the sound continues, it may need professional assistance.

Frequency of Filter Replacement 

The ideal replacement schedule depends on the filter thickness and household conditions. Here is an approximate breakdown of how often you need to replace filters depending on their thickness.

• 1-inch and 2-inch furnace filters: 1-3 months.
• 4-inch furnace filters: 6-9 months.
• 5-inch furnace filters: 9-12 months.

If you have pets, suffer from allergies, or use the HVAC system heavily, you may need to change the furnace filter more frequently. The rule of thumb is to inspect the filter once a month and make a decision about its replacement.

Choosing the Right Filter Type 

Factors to consider when choosing a filter are materials and efficiency.

• Fiberglass filters are inexpensive but offer minimal filtration
• Pleated filters provide better air quality by trapping smaller particles
• High-efficiency HEPA filters remove allergens but may restrict airflow

You may also need to review such factors as MERV (Minimum Efficiency Reporting Value), MPR (Microparticle Performance Rating), and FPR (Filter Performance Rating).

Tips for Disposal of Used Filters

After removing the old filter, you need to dispose of it properly:

• Seal in a Bag Before Disposal: Place the old filter in a plastic bag to contain dust and allergens before throwing it away.
• Check for Recycling Options: Some filters, especially those without fiberglass, may be recyclable. Check with local waste management to see if recycling is available in your area.
• Dispose of in Regular Trash if Necessary: If recycling isn’t an option, discard the filter in your household trash, but make sure to follow local disposal guidelines.

Furnace filters collect dust, allergens, and other contaminants. Always wash your hands thoroughly after touching the dirty filter.

When to Call a Professional 

Changing the furnace filter may not always be a DIY job. In some cases, the filter could be hard to access, or the furnace system too complex to handle on your own. If you have a furnace maintenance plan, it could cover the air filter changes.

If you aren’t sure that you can change the furnace filter correctly, always contact a professional. A poorly installed filter could damage the system and result in significant expenses.

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