When to Replace Your HVAC Air Filter: A Complete Guide

The Importance of Regular Air Filter Changes

Your HVAC air filter is one of the most important—and most neglected—components of your home's heating and cooling system.

How Often Should You Change Your Filter?

The answer depends on several factors:

• Basic fiberglass filters: Every 30 days
• Pleated filters: Every 60-90 days
• High-efficiency filters: Every 6-12 months

Factors That Affect Filter Life

1. Pets - Homes with pets need more frequent changes
2. Allergies - Those with allergies benefit from monthly changes
3. Home occupancy - More people = more frequent changes
4. Air quality - Poor outdoor air quality requires more attention

Signs Your Filter Needs Changing

• Visible dust and debris on the filter
• Increased energy bills
• Longer heating/cooling cycles
• More dust around vents
• Worsening allergy symptoms

Types of Air Filters

Fiberglass Filters

• Cheapest option
• Least effective at filtration
• Need frequent replacement

Pleated Filters

• Better filtration
• Moderate cost
• Good for most homes

HEPA Filters

• Best filtration
• Highest cost
• Ideal for allergies/asthma

How to Change Your Filter

1. Turn off your HVAC system
2. Locate the filter (usually near return air duct)
3. Note the filter size (printed on frame)
4. Remove old filter
5. Insert new filter (arrow points toward furnace)
6. Turn system back on

Set up automatic reminders for filter changes with Maintenance Minder!