Changing your furnace filter is one of the easiest and most important things you can do to keep your heating system running smoothly. A clean filter protects your equipment, improves indoor air quality, and helps lower your energy bills.
Here’s how to do it right.
Why It Matters
- Improves airflow and reduces strain on your system
- Extends equipment life by preventing dirt buildup
- Reduces energy consumption (clogged filters make your system work harder)
- Traps dust, allergens, and pet dander to improve indoor air quality
How Often Should You Change Your Furnace Filter?
Wondering how to replace your furnace filter? Follow this easy step-by-step guide to improve air quality and system efficiency.
What You’ll Need
- A replacement filter (match the size printed on the old one). Order furnace filters directly from our online store and have them delivered to your door.
- A flashlight (if your furnace is in a dark space)
- Optional: gloves and a mask (especially if the old filter is dusty)
Step-by-Step Filter Replacement
- Turn Off the Furnace
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- Shut off your thermostat or the system power to avoid the fan kicking on while you’re working.
- Locate the Filter Compartment
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- It’s usually found near the return air duct, blower compartment, or behind a removable panel.
- Remove the Old Filter
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- Slide the old filter out carefully to avoid shaking loose dust.
- Check the direction of the airflow arrow on the filter frame.
- Check the Filter Size
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- Look for dimensions printed on the side of the filter (e.g., 16x25x1). Match it exactly.
- Insert the New Filter
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- Make sure the airflow arrow on the new filter points toward the furnace or blower.
- Slide it in securely so there are no gaps.
- Turn the System Back On
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- Restore power at the thermostat or breaker panel and enjoy improved airflow.
Choosing the Right Filter
- Fiberglass Filters: Inexpensive, good for basic dust protection
- Pleated Filters: Capture smaller particles, better for air quality
- High-MERV or HEPA Filters: Best filtration, but check system compatibility
Pro Tip:
Set a reminder on your phone or calendar to check your filter monthly. Some smart thermostats can even alert you when it’s time to change it.
Need Help or Want a Furnace Tune-Up? Affordable Comfort offers comprehensive furnace maintenance, including filter checks, airflow testing, and safety inspections.
