Ask Bob HVAC and Comfort How often should I replace my HVAC air filter?
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How often should I replace my HVAC air filter?

Standard 1-inch fiberglass filters should be replaced every 30 days. Pleated filters with higher MERV ratings last 60 to 90 days. If you have pets, allergies, or live in a dusty area, change them more frequently. A dirty filter is the most common cause of HVAC problems.

Why It Matters

A clean filter improves air quality, protects your HVAC equipment, and keeps your system running efficiently. It is the simplest maintenance task you can do.

Related Questions

How old should my HVAC system be before replacing? What size HVAC system do I need for my home? Why is my AC not blowing cold air? Why is my furnace not turning on? How can I improve my indoor air quality?

Read the Full Guide

For a deeper dive, check out the HomeCircle Handbook entry on this topic.

Setting Up Your Home Maintenance Schedule

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