Skip to main content
Yes, most homes still benefit from a portable air purifier even with a good furnace filter. An HVAC furnace filter cleans air only when the system’s fan is running and is limited to its MERV grade, while a portable HEPA 14 purifier filters the air in your occupied room continuously and to a far higher standard. They work best together.

​
What does a furnace (HVAC) filter do?

A furnace filter sits in your central heating and cooling system, capturing particles as air passes through — but only while the blower is running. Its job is partly to protect the equipment, and residential systems are usually limited to around MERV 8–13 because higher-MERV filters restrict airflow and can strain the blower. So whole-home filtration is real but intermittent and capped at a MERV grade.

​
How does that compare to a HEPA 14 air purifier?

A standalone purifier runs on its own schedule in the room you’re actually in, independent of the HVAC. The AirPro uses HEPA 14 (99.995% at 0.3 microns, 99.9% at 0.1 microns) — far beyond the MERV scale, which tops out at MERV 16 (roughly 95% at 0.3 microns). That means a portable HEPA 14 unit captures ultrafine particles a furnace filter lets through, and it keeps working even when the furnace or AC is off.

​
Quick comparison

​
Should I upgrade my furnace filter or buy an air purifier?

Do both where you can. Use the highest-MERV furnace filter your system supports (check the manual so you don’t restrict airflow) for whole-home baseline filtration, and add a portable HEPA 14 purifier in the bedroom or main living area for continuous, higher-grade filtration where it matters most. Running the HVAC fan on “circulate” plus a room purifier gives the most consistent results.
An air purifier reduces airborne particles but is a wellness device, not a medical treatment. Filtration works best alongside removing pollutant sources and ventilating with clean outdoor air. See the EPA Guide to Air Cleaners in the Home.

​
Can I put a HEPA 14 filter in my furnace instead?

Generally no. True HEPA 14 media is too dense for most residential HVAC blowers and would choke airflow, which is why whole-home systems use MERV-rated filters and standalone rooms use HEPA. See HEPA 14 vs. True HEPA for how the grades compare. Sources: EPA — What is a MERV rating? · EPA — Guide to Air Cleaners in the Home
Related: HEPA 14 vs. True HEPA · Air Purifier vs. Air Conditioner · CADR vs. ACH Explained · Room Coverage · Overview