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

Standard 1-inch fiberglass filters should be replaced every 30 days. Pleated filters with higher MERV ratings can last 60 to 90 days. Homes with pets, smokers, or allergy sufferers may need monthly changes. Check your filter monthly until you see a pattern. A dirty filter restricts airflow, reduces efficiency, and can cause your HVAC system to freeze up or overheat.

Why It Matters

Regular filter changes are the single most important and easiest HVAC maintenance task. They protect your equipment and improve air quality.

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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