Your Guide to the Best HEPA Air Purifiers

Woman reading a book in her living room with her dog beside her

HEPA air purifiers are a worthy investment. Improving your air quality is one of the single easiest things you can do to improve your health. 

Some combination of pollutants, dust, pollen, pet dander, smoke, viruses, and bacteria contaminate your indoor air every day and HEPA air purifiers can help.

A high efficiency particulate air (HEPA) filter is a pleated device used to filter forced air. It can remove particles from surrounding air. A number of devices use these filters, but you’ll primarily see them these days in air purifiers. Portable HEPA air purifiers are designed to remove all kinds of particles and pollutants from the air in your home.

In this guide, we’ll cover the different features of HEPA air purifiers to consider when making a purchase. At Air Oasis, we offer best-in-class HEPA air purifiers. 

You can shop our most popular HEPA air purifier model here

“Quiet” = HEPA Air Purifier Feature

No matter who you ask, a quieter air purifier is always a positive. Imagine a whisper quiet filter purifying your air, helping you breathe better every hour of the day. You don’t even know it’s there!

HEPA air purifiers will have different levels of sound based on the official parameters and measurements of the filter. The size of the air filter and air purifiers are chosen in relation to the size of the room the filter is covering.

We recently talked more about how many square feet an air purifier can cover. When buying an air purifier, you should measure the size of the space. A match in measurement and capacity will ensure you pick an air purifier that will perform to spec.

The right-sized air purifier will play the biggest role in the noise level of your purifier. 

For example, the Air Oasis iAdaptAir® HEPA UV Air Purifier comes in three key sizes for rooms ranging from 250 square feet to 850 square feet. With your room measurements in hand, you would select the small, medium, or large size that is the best fit.

“App-Enabled” = HEPA Air Purifier Feature

In a world that can be increasingly controlled from your phone, it’s possible to have the same “smart” amenities for your HEPA air purifier. The Air Oasis iAdaptAir® HEPA UV Air Purifier is the smartest home air purifier on the market, with app-enabled technology allowing you to control your air purifier from the comfort of your couch, at work, at the grocery store, or wherever life finds you. 

In addition to app-enabled technology, the iAdaptAir® comes with four additional technologies and three different size options.

As with many technologies, not all are created equal. With the option of app-enabled purifiers, you’ll also want to consider whether the app can be operated remotely, whether the purifier connects to multiple devices, and whether it requires Wifi connection. 

“Effective” = HEPA Air Purifier Feature

We know it to be true that poor indoor air quality can impact your health

According to the Environmental Protection Agency (EPA), indoor air can be two to five (and even up to 100) times more polluted than outdoor air. 

Sources of indoor air pollution can include personal care products, off-gassing from furniture and mattresses, wet or damp carpets, paint, building materials, cleaning products, fuel sources (oil, gas, coal, wood, kerosene, etc.), and tobacco products, just to name a few. 

HEPA filters have long been proven to remove or reduce these types of air pollution. 

HEPA & Indoor Environment

One study evaluated an air purifier’s effectiveness in reducing the concentration of different sized particulate matter and ions in the real-world indoor environment. Two types of air purifiers equipped with High-Efficiency Particulate Air (HEPA) filters were deployed. The filters were used in a general indoor air environment with the presence of candles and incense. Researchers reported the use of air purifiers with mechanical filters (i.e. HEPA) to be most effective for air purification. 


HEPA filters have also gained visibility since the COVID-19 pandemic. Aerosol scientist Faye McNeill at Columbia University studies microscopic particles in the air — everything from dust to smog. According to McNeill, HEPA is the international gold standard for filtering particles. 

With HEPA filters, 99.97 percent of particles 0.1 microns in diameter are trapped. This means that HEPA filters can trap particles even as small as coronavirus. When people put droplets of saliva or respiratory fluid into the air from coughing, breathing, or talking, a HEPA filter is able to trap those particles.

Air Oasis HEPA Air Purifiers

Our customer stories illustrate how HEPA air purifiers improve people’s lives. 

At Air Oasis, we use a platform called TrustPilot as a third party resource to ensure the stories and reviews we post to our website are real and accurate. 

Kent M. commented, “I recently assessed my home air purification situation and decided to increase my iAdapt Air purifiers from three to four by purchasing an additional Large iAdapt air purifier and was able to take advantage of the Air Oasis $100 off special. So now, I have two small and two large iAdapt Air purifiers in my home. I have enjoyed my air purifiers and have found that my units can run 8-hours a day for a year or more before the filters need replacing. I decided to also replace the UV bulbs at the same time I do a filter change as you need to remove the filter to get to the bulb. The filter and bulb changes are easy, fast and no tools are needed. Having air purifiers from Air Oasis on duty every day gives us the peace of mind that our household air is always fresh and clean."

Air Oasis customer Michael K. said, “The proof is in the filter…. These machines scrub the air. My family breathes so much better because of these. SO grateful to have found Air Oasis.” 

Finally, Charlene commented on the quiet features of her air filter, “Tropical island! I couldn't be happier with my new Oasis Air Purifier! It's whisper quiet and I feel like I'm on an island in the tropics. Wow! Amazing difference in my indoor air quality!”

Buy a HEPA Air Purifier

HEPA air purifiers are the gold standard of air purification. When you’re ready to make a HEPA air purifier purchase, do the vetting. Make sure it’s manufactured by a company you can trust, and has the performance proof to back up claims.

You’ll find countless product comparisons when shopping online, so here’s our take on what you’ll want to consider. 

  • Budget. What’s your budget? Know this before you begin your research.
  • Room size. Measure the size of your room so you can purchase a purifier with the power to filter it.
  • Technology needs. Do you want your purifier to be app-enabled? 
  • Return policies. If you’re unhappy with your purifier purchase, can you return it for free? 

When it comes to quality, competitive pricing, and proven product technology you can trust, there is no better HEPA purifier on the market than the Air Oasis iAdaptAir®. 

Shop our full HEPA purifier line-up here

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