Furnace Filter

If you’ve been asking yourself how often change furnace filter, you’re already on the right track to keeping your home efficient and your air clean. This simple maintenance task is one of the most important things you can do to extend the life of your heating system and protect your indoor air quality.

Not sure how often to change your furnace filter? Get help from Qualitech Heating & Cooling now

How Often Change Furnace Filter

Most homeowners should change their furnace filter every 1 to 3 months, but it depends on your home’s environment, the type of filter, and furnace usage.

Here’s a quick guide:

• Basic fiberglass filters: Replace every 30 days

• Pleated filters: Replace every 60–90 days

• HEPA filters: Replace every 6–12 months (inspect monthly)

• Homes with pets/allergies: Change every 30–45 days

• No pets, clean air: You can stretch to 90 days

For most families, the ideal routine is changing the filter every 60 days for safety and efficiency.

Why Furnace Filter Replacement Matters

Your furnace filter traps dust, pollen, and other airborne particles. Over time, it gets clogged and:

• Restricts airflow

• Causes the furnace to overheat

• Increases your energy bills

• Lowers indoor air quality

• Wears out your HVAC components

Neglecting your air filter replacement can lead to costly repairs or even a full system breakdown.

Signs You Need to Change the Furnace Filter

• Dust around vents

• HVAC system sounds louder than usual

• Increased allergy or asthma symptoms

• Rising utility bills

• Filter looks visibly dirty

If you notice any of these, it’s time to swap it out.

FAQs

Q: How often change furnace filter in winter?
Every 30–60 days during heavy use. Check it monthly.

Q: Can I clean and reuse a furnace filter?
Only if it’s labeled washable. Most disposable filters must be replaced.

Q: What happens if I don’t change my furnace filter?
Poor airflow, higher energy bills, system stress, and dirty indoor air.