Air Purifier: HSA Eligibility

What is an air purifier, and what does it treat? 

An air purifier filters contaminants and pollutants from the air. It may clear out dust, pet dander, wood smoke, pollen, and mold spores. These devices may benefit people with allergies or asthma and reduce secondhand tobacco smoke. 

Air filters and purifiers can qualify as HSA eligible expenses if a licensed healthcare provider recommends them to treat a medical condition.  

What types of air purifiers are there? 

Air purifiers use different technologies and target different pollutants. Some of the more common purifiers are listed below. 

HEPA air purifiers 

Also known as mechanical filters, these purifiers use fans to force air through filters, which trap particles. They can remove larger particles such as dust, pollen, and mold spores. Their filters need to be replaced every 6 to 12 months. 

Activated carbon  

These purifiers use activated carbon (also known as activated charcoal) to trap certain gases, particularly ones that cause odors. Many purifiers will have an activated carbon and a mechanical filter because activated carbon filters don’t remove particles. Filters for these purifiers need to be replaced every three months.  

UV-C air purifiers 

UV-C or UVGI filters use ultraviolet germicidal irradiation to kill viruses, bacteria, and fungal spores. But they may not be effective against bacteria and mold spores that are resistant to UV radiation.  

Which medical conditions qualify an air purifier for HSA reimbursement? 

A healthcare provider might recommend an air purifier to prevent, treat, or mitigate respiratory conditions, allergies, and immune conditions, making the purifier HSA eligible. 

Examples of these conditions include: 

• Asthma 

• Chronic obstructive pulmonary disease (COPD) 

• Chronic bronchitis 

• Emphysema 

• Severe allergies 

• Chemotherapy treatment 

• Post-surgery recovery 

You’ll need an LMN from a licensed healthcare provider with a diagnosis to qualify for reimbursement (more on this below). 

How do I choose an air purifier for my condition? 

Here’s what to pay attention to when choosing an air purifier. 

• Condition: Pick an air purifier that will remove the pollutants or particles aggravating your condition. As mentioned above, different purifiers focus on different irritants. For example, HEPA or mechanical filters clear out dust, pollen, and mold spores. 

• Energy use: Try to find a product that will improve your indoor air quality without consuming a ton of energy. You’ll need to look for an ideal combination of high-filtration efficiency and high airflow, something referred to as the Clean Air Delivery Rate or CADR. Find an air purifier with a CADR of at least 300. 

• Room size: To properly clean the air in a room, you’ll need a purifier that can exchange the air in the room several times each hour. Five air exchanges an hour is recommended. Two air exchanges is the minimum.  

• Noise: Air purifiers are very loud on their highest setting. Buying an air purifier rated for a larger room will allow you to run it on lower speeds and generate less noise. 

• Filter replacement: The best air purifiers don’t require tools to replace the filters. You simply pop out a door to pull out the old filter. Keep in mind that filters can be expensive to replace. A removable filter that can be cleaned may be more practical. 

How do I get a Letter of Medical Necessity for an air purifier? 

To get a Letter of Medical Necessity (LMN), speak to a licensed healthcare provider at an online or in-person appointment.  

What should my LMN include? 

An LMN for an air purifier should contain:  

• The date 

• Your name, date of birth, address, and contact information 

• The healthcare provider's name, credentials, and contact information 

• A description of your medical condition, including the diagnosis, medical history, and how long it’s lasted 

• Why an air purifier is medically necessary for your condition 

• How long the treatment will last 

• The provider’s signature 

Does the air purifier brand or model matter for HSA eligibility? 

No, the air purifier brand isn’t important. Generally, you can buy any brand of air purifier as long as you have an LMN from a healthcare provider showing that it treats a diagnosed medical condition.  

How do I buy an air purifier with my HSA? 

To buy an air purifier with pre-tax dollars in your health savings account, you’ll need to pay for it out of pocket and reimburse yourself later.  

Get an itemized receipt and keep the LMN. The receipt should have the date of the purchase, the item, the retailer, and how much you paid. 

Can I use an FSA or HRA for an air purifier? 

An air purifier can be FSA or HRA eligible. Just like with a health savings account, you’ll need an LMN from a healthcare provider detailing how the device treats a diagnosed medical condition. 

HSA eligible allergy and air quality products you can buy without an LMN 

Some allergy and air quality products are HSA eligible without an LMN, including over-the-counter allergy and sinus medications  and nebulizers. 

FAQs 

Is a humidifier HSA eligible?  

A humidifier is only HSA eligible with an LMN from a licensed healthcare provider. It must be used to treat or mitigate a medical condition. 

Can I use my HSA for a dehumidifier?  

Like a humidifier, a dehumidifier is only HSA eligible with an LMN from a healthcare provider.  

Can I use my HSA to buy an air purifier for asthma? 

You can purchase an air purifier to help with asthma, but you’ll need an LMN from a healthcare provider explaining how the product will treat your asthma. 

References 

Christian, T.A. (2026). Air Purifier Buying Guide. Consumer Reports.  

Cornell Law School, Legal Information Institute. (n.d.). 26 CFR § 1.213-1 - Medical, dental, etc., expenses. 

U.S. Environmental Protection Agency. (2026). Air Cleaners, HVAC Filters, and Respiratory Viruses. 

Reviewed by the Health-E Commerce® Compliance Team