How Often Do I Need to Change my HVAC Filter?

Don’t forget to change your HVAC filter!  Regular changes can make a big difference in your home’s heating and cooling.  Not only will it keep the air in your home clean and clear, but it can also help extend the life of your unit, reduce energy costs, and save you money in the long run! So make sure to get up to date with regular filter changes.

How often should I change my filters? 

Our Mac Plumbing, Heating & Air team recommends checking your filters every 30 days and replacing them when they’re dirty (typically 30 to 60 days). If you have pets in the home or if your unit is working harder than usual (during a summer heatwave or during a frigid coldspell), you may need to replace them more frequently.

Benefits of changing your home’s HVAC filters regularly:

Lower utility bills: 

  • When the filter isn’t clean, your system will have to work harder to push air through it, leading to higher utility bills.

 Decrease in allergens: 

  • Dust, mold and other harmful allergens can build up in your system, leading to health issues for you and your family. 

Improved air quality: 

Longer system life: 

  • Clean filters result in fewer repairs and a longer life for your HVAC system.

Types of air filters

  • Lower quality fiberglass filters are more affordable, but they don’t last long and need to be changed every month.
  • Pleated air filters are higher quality and are very effective in trapping particles and last up to 90 days.


  • If you have pets, change your filters every month or so to keep your air clean.


  • If you suffer from allergies, dust or debris can trigger a reaction. To ensure your system is pumping only clean air, be sure to change your filters at least every 50 days.
  • See the EPA recommendations for HEPA filters.

 While these factors affect the frequency air filter replacement, you should visually inspect your filter every month to check for excess particle buildup. If the dirty air filter is completely layered with dust and debris, it’s a good idea to change the filter even if it hasn’t reached the end of its recommended lifespan.
Be prepared with a check-up from Mac and if you find yourself with plumbing or HVAC problems, be sure to contact Mac Plumbing, Heating & Air here or call us at (931) 552-5555.