How Often Should I Change My Furnace Filter?

How Often Should I Change My Furnace Filter?

Changing your furnace filter might seem like a small task, but it plays a big role in keeping your home comfortable and your heating system running smoothly. A clean filter helps improve indoor air quality, protects your furnace, and can even lower your energy bills. But how often should you really be changing it?

Why Furnace Filters Are Important

Your furnace filter traps dust, pet dander, pollen, and other particles floating in the air. Without it, these contaminants would circulate through your home and settle inside your heating system. When the filter gets clogged, it blocks airflow and forces your furnace to work harder. This not only drives up energy costs but can also shorten the lifespan of your equipment.

How Often to Change Your Furnace Filter

The right replacement schedule depends on the type of filter you have:

• 1-inch filters: Replace every 1–3 months

• 4- to 5-inch filters: Replace every 6–12 months

If you’re not sure which filter your furnace uses, check the size printed on the frame or ask a professional technician.

Signs It’s Time to Replace Your Filter

Even if it hasn’t been the full 3 months, certain warning signs can tell you your filter needs changing sooner:

• Dust buildup on the filter or vents

• Weak airflow from your registers

• More frequent allergy or asthma symptoms

• A stuffy or dusty feeling in your home

If you notice any of these issues, it’s best to check your filter right away.

Factors That Affect How Often You Should Change Filters

Some homes need more frequent filter changes than others. You may want to replace yours more often if:

• You have pets: Pet hair and dander clog filters quickly.

• You have allergies: Clean filters improve indoor air quality.

• There’s smoking in the home: Smoke adds more particles to the air.

• You use the furnace often: In New Jersey, heavy furnace use in the winter means filters get dirty faster.

What Happens If You Don’t Change It?

Neglecting your furnace filter can lead to:

• Higher energy bills from reduced airflow

• Breakdowns or damage caused by an overworked furnace

• Poor indoor air quality with more dust and allergens circulating

Replacing your filter regularly is a quick, inexpensive way to avoid bigger problems down the road.

Frequently Asked Questions

Can I run my furnace without a filter?
It’s not recommended. Running without a filter lets dust and debris build up inside your system, which can lead to serious damage.

How do I know which filter to buy?
Check the size printed on your current filter. Most hardware stores carry standard sizes, or you can ask your HVAC technician for guidance.

Do reusable filters need to be replaced?
Reusable filters don’t need replacing, but they should be cleaned at least once a month.

Can a dirty filter stop my furnace from working?
Yes. If the filter is too clogged, your system may shut down to protect itself.

Should I change my filter more often in the winter?
Yes. Since your furnace runs more during cold months, the filter gets dirty faster.

Need Furnace Service in New Jersey?

If you’re unsure how to replace your furnace filter or want to make sure your heating system is in top shape, the team at Len The Plumber Heating & Air is here to help. We provide fast, reliable furnace services throughout New Jersey—so your home stays warm and comfortable all season long.

Call today to schedule furnace service with our expert team!