How Often to Change Your HVAC Filter (And Why It Matters)

Changing your air filter regularly is the single most important maintenance task you can do for your HVAC system. A clean filter improves efficiency, air quality, and system lifespan.

How Often to Change Your Filter

Basic 1-inch Filters - Every 1-3 months during use - Monthly during heavy use (summer AC, winter heating) - More frequently if you have pets, allergies, or dusty conditions

Thicker Filters (4-5 inch) - Every 6-12 months - Check every 3 months - Replace when visibly dirty

Reusable/Washable Filters - Clean monthly during heavy use - Follow manufacturer cleaning instructions - Replace when damaged or after several years

Factors That Require More Frequent Changes

- **Pets:** Pet hair and dander clog filters faster

• **Allergies:** Cleaner filters help, change more often
• **Dusty conditions:** Construction, unpaved roads, dry climate
• **Large households:** More people means more particulates
• **Running system continuously:** More air through the filter

Why Filter Changes Matter

For Your System - Dirty filters restrict airflow - The system works harder, using more energy - Components overheat and wear faster - Can cause the system to freeze up - May lead to expensive repairs

For Your Health - Filters trap dust, pollen, and particles - A clogged filter cannot trap new particles - Clean filters mean cleaner indoor air - Especially important for allergy sufferers

For Your Wallet - A clean filter can reduce energy bills by 5-15% - Prevents expensive repairs - Extends equipment life

How to Change Your Filter

Find Your Filter Common locations: - Return air vent in wall or ceiling - Slot in furnace or air handler - Behind a removable grille

Note the Size - Size is printed on the filter frame (example: 20x25x1) - Measure if no size is shown - Keep spare filters on hand

Install Correctly - Note airflow direction arrow on filter - Arrow points toward the furnace/air handler - Ensure filter fits snugly without gaps

Choosing the Right Filter

MERV Ratings - MERV 1-4: Basic, minimal filtration - MERV 5-8: Good for most homes - MERV 9-12: Better for allergies - MERV 13+: Hospital-grade (check if your system can handle)

Important Notes - Higher MERV is not always better - Very high MERV can restrict airflow - Match filter to your system's capabilities - Ask your HVAC technician what is appropriate

Set a Reminder

- Use a calendar reminder

• Write the installation date on the filter
• Check monthly even if you do not replace
• Some smart thermostats track filter life