Our newest AirDoctor air purifier combines award-winning performance with a sleek new design. Available in two new colors, our most energy efficient model is ideal for large rooms and open concepts.
Circulates air in 694 sq. ft. 4x/hr for continuous, clean air
Advanced triple-filtration technology with UltraHEPA
Smart Purifier + Mobile App upgrade available
$679.00
Sale price $679.00Regular price
Product information
The AirDoctor 4000 is a premium air purifier engineered to deliver hospital-grade air quality in everyday living spaces. At its core is our exclusive UltraHEPA® filter which is independently tested and proven to capture 99.99% of airborne particles as small as 0.003 microns, including allergens, mold spores, smoke, bacteria, and viruses.
Its advanced 3-stage filtration system works from the outside in to address virtually every category of indoor air pollutant- quietly, continuously, and effectively.
Pre-Filter captures larger airborne particles first, including pet hair, dust, and lint, extending the life of the filters below
Premium Carbon/Gas Trap/VOC Filter neutralizes harmful gases, toxic VOCs, and volatile organic compounds (VOCs) that standard purifiers miss
UltraHEPA® Filter captures 99.99% of remaining particles as small as 0.003 microns including allergens, mold spores, smoke, bacteria, and viruses
Designed for large to extra-large rooms, it circulates air in spaces up to 694 sq. ft. four times per hour- the frequency recommended by a Harvard University study cited by the CDC for effective allergen removal.
Proven by science
In third-party laboratory testing conducted by MRIGlobal, AirDoctor 4000 removed 99.97% of live SARS-CoV-2 virus from the air in a test chamber
AirDoctor 4000 removed 99.99% of tested bacteria & viruses, including H1N1, in third-party laboratory testing
AirDoctor 4000 is independently tested & proven to capture airborne particles as small as 0.003 microns in size
Technical specifications
Room coverage: Up to 694 sq. ft., 4x/hr
Circulates the air in large to extra-large rooms including living/family rooms, kitchens, and primary bedrooms
UltraHEPA® - captures 99.99% of particles to 0.003 microns
Dual-Action Carbon - Activated Carbon with Potassium Permanganate for real protection against gases and VOCs
CADR (smoke): 370 CFM
Dimensions: 13.9″ (D) x 28″ (H)
Weight: 15.8 lbs
Optional Smart features: Wifi connect + mobile app with AQI forecast
What's in the box
1 Air Purifier
1 Filter with Pre-Filter, UltraHEPA®, and Carbon/VOC Material
1 Manual
1 Product Card-Quick Start Guide
Voted “Best Air Purifier”
Awarded #1 air purifier to protect your home.
The gold standard in air purification
We built AirDoctor to be the best.
Maximum coverage
Purify any size room with a range of models.
UltraHEPA
Captures particles 100x smaller than the HEPA standard.
Premium Carbon/VOC Filter
Removes toxic gases & VOCs most air purifiers miss.
Auto-mode
Self-adjusts filtration level based on your air quality.
24-hour timer
Schedule air purification around your daily routine.
Smart app
Control your air quality from anywhere (Smart models).
What the experts are saying
Best Air Purifiers For Mold 2026 "7 Models That Meet Pros’ Strict Standards"
2025 Best Air Purifiers “Best Air Purifier for PM2.5 & Gases”
Reader's Choice 2026 “Best Air Purifier Brand”
Premium air purification with UltraHEPA®
Captures particles 100x smaller than the HEPA standard.
We take over 20,000 breaths per day, inhaling whatever pollutants are in our environment. Even when you’re “safe” at home your health is at risk.
Not only does outdoor pollution make its way inside, there are many indoor sources of air pollution too, including stoves, cleaning products, and building materials. In fact, the Environmental Protection Agency (EPA) says indoor air can be 5x–100x more polluted than outdoor air!
Now the good news. AirDoctor’s UltraHEPA filter removes virtually 100% of airborne contaminants as small as 0.003 microns—that’s 100x smaller than the HEPA standard.
Capture the airborne contaminants hiding in your home’s air and take control of your air quality with AirDoctor.
Inside our Premium Carbon/VOC Filter
Remove the toxic gases most air purifiers miss.
HEPA-only air purifiers only do half the job. They remove harmful particles, but do nothing to protect you from toxic gases and volatile organic compounds (VOCs):
Toxic gases: ozone, nitrogen dioxide, etc.
VOCs: benzene, formaldehyde, & more from furniture, flooring, cleaning products, etc.
Health risks: Asthma, cognitive decline, cardiovascular disease, & even cancer
Removes more pollutants than ordinary purifiers
AirDoctor captures 99.99% of airborne particles.
Pet dander
Dust
Volatile organic compounds
Toxic gases
Mold spores
Pollen
Viruses & bacteria
Smoke
Proven by science, backed by testing
Don’t settle for inferior filters or misleading marketing claims.
Better than HEPA
UltraHEPA® is tested to remove particles 100x smaller than the HEPA standard.
Third-party proof
AirDoctor eliminated 99.99% of tested bacteria & viruses in 3rd-party testing.
Complete peace of mind
AirDoctor also effectively eliminated SARS-CoV-2 in a controlled test chamber.
Protect your home. Protect your health.
Wellness begins with the air you breathe every day.
Better sleep
Lower levels of dust & pollutants in the air reduce nighttime congestion.
Promotes cognitive function
Higher levels of PM2.5 are directly linked to reduced memory.
Reduces odors
Go beyond particles to remove toxic gases & VOCs most air purifiers miss.
Lower risk of infectious diseases
There’s an AirDoctor for every room. Start with where you sleep & gather.
Overall rating: 4.224299 / 5 from 107 reviews.
AI Generated Review Summary
The AirDoctor 4000 is an award-winning air purifier designed for large spaces, capturing 99.99% of particles as small as 0.003 microns. It effectively removes toxic gases, VOCs, and odors. Customer feedback on air quality improvement and filter performance is mixed, while customer service experiences vary.
Summary topics
Air Quality (44%): Many customers remarked that the Air Doctor is a must-have for clean air, especially for dogs and small kids.
Air Quality Improvement (13%): Customers have mixed opinions about the difference this product makes in air quality, with some noticing a significant improvement and others not noticing any difference at all.
Filter Performance (9%): Customers have mixed opinions about filters, with some finding them good and others experiencing issues.
"With two golden retrievers and small kids, this is a must to have clean air for your family!" — Ashley
"I love that I am helping clean my air because you breath 24/7 so having clean air was important to me." — Shelby
"Each time I use hairspray the Air Doctor turns on and immediately cleans the air." — Kelly
Reviews
Quality control must be going
"Quality control must be going down at AirDoctor. I ordered the 4000 model and the first one didn't work because I couldn't get the lock function to move properly. Hence the unit always had the filter replacement light on and it stopped functioning. They sent me a replacement and that one didn't work either! The fan didn't even run! Where is your quality control??? Do you even check? Still waiting for my refund. Spent a lot of time chatting with an agent, explaining everything, recording, sending videos, packaging everything back up and having to drive the 20 pound units to the FedEx store. STILL waiting for my refund, as they won't refund it immediately -- I have to contact them! With what?? Confirmation number? So disappointed!!!"
— Deborah Z. (1/5)
I feel This is a
"I feel This is a scam. Our home has been professionally confirm with high amounts of mold. So much mold that we need to move out for 4-5 months for remediation. The blue light has been on constantly showing that air quality is good which it’s not!"
— amy t. (1/5)
I haven’t really noticed a
"I haven’t really noticed a difference of the smells in my house. The light is always blue, as in the air is good. Just to test it, I sprayed some “Endust” into a cleaning towel right by the sensor and the sensor light finally turned red and the fan adjusted for about 2 minutes of work and then it went back to low speed and the light turned blue. The verdict is still out if it was worth the $600!"
— Tammy D. (3/5)
The air doctor is fabulous.
"The air doctor is fabulous. It’s always been on level one so I didn’t have a big problem to begin with. I have it on automatic and it never goes to two although it went to two or three when I cooked with my gas stove a couple of times great Product."
— Tammy L. (5/5)
My AirDoctor 4000 wasn't working
"My AirDoctor 4000 wasn't working right from the beginning, but customer service was excellent and they gave me no trouble at all with the refund after I dropped off my Air doctor to my nearest Fedex location."
— Zelda W. (4/5)
I have two other smaller
"I have two other smaller Air Doctors and love how they clean the air as well as how easy they are to maintain. I needed a larger one for my garage due to wildfire smoke and thought I would try the 4000. I love that it has WiFi so I can control it from upstairs. I bought this one in black and I really like the look and the fact that it has wheels. It is very lightweight certainly compared to my larger IQ Air. I just set up the Wifi and am very happy to have this before the smoke comes back into town."
— Amara S. (5/5)
No VOC sensor. I don’t
"No VOC sensor. I don’t know if this thing works. It is always on low during auto and can’t sense when VOCs are high. Is it using the internet to decide when to turn on because it has my location? It arrived after the AQI went back to normal so I have yet to see it proactively do anything."
— Laura P. (2/5)
AirDoctor operates very quietly. I
"AirDoctor operates very quietly. I found it interesting that my bedroom and den already had clean air. I set the AirDoctor up and in less than a minute, the air was in the ‘blue’. I do have hardwood floors so that could be the reason. I am keeping it to keep air quality good."
— Patricia E. (5/5)
It's a little bigger than
"It's a little bigger than we imagined it'd be/look, but seems to work well. The front panel to change the filter seems a little tough to get on and off - I hope it doesnt break eventually. Like that it has wheels. This took us a while to get because it was so expensive. Free shipping on top of a sale is really helpful. . . I feel all of Air Doctors stuff could be proced a lot cheaper. Most of us buying them have health issues and no money because of it."
— Ellen B. (4/5)
The AirDoctor 4000 was one
"The AirDoctor 4000 was one of four air doctor units that we purchased. This one was assigned to our second largest space that includes the kitchen, dining table area, and another sitting space. The area is also somewhat open to the stairs and the second floor hallway, so the unit has quite a workload. The shape of the AirDoctor 4000 was ideal for this particular location. We have noticed the improvement in the air quality, especially in relation to the propane oven/stove. When a burner is turned on, there is a slight initial release of propane vapors from the stove into the ambient air. We keep the 4000 in the automatic mode and we've noticed that when the stove goes on, the 4000 immediately switches from the blue indicator (for purified air), briefly to red, then yellow, and within a minute or so it has cleaned the air and returns to the blue setting. The fan speed increases briefly, then returns to the whisper setting (lowest speed). So, we get a clear indication of what the unit is providing for our air quality. We love this unit and can recommend it highly to any prospective buyers."
— Alvin S. (5/5)
Q&A
Frequently Asked Questions
Why are air changes per hour (ACH) important when shopping for an air purifier?
Air changes per hour (ACH) refers to how many times the air is changed with new, clean air in a given space within the span of an hour. A Harvard University Study cited by the CDC recommends at least 4 air changes per hour to effectively remove allergens like smoke, bacteria, viruses, dust, and pollen.
What is CADR, and why’s it important?
CADR, or Clean Air Delivery Rate, refers to your air purifier’s efficiency in removing these three contaminants over time: pollen, dust, and smoke. Higher CADR numbers indicate better air cleaning performance. The smoke CADR number is most stringent, reflecting the unit’s ability to eliminate the smallest and most dangerous particles from your indoor air.
Which air purifier is right for me?
Great question! Choosing the right air purifier will depend on the size of your room and the air circulations per hour. According to the Harvard University study, 4 air changes per hour are recommended for optimal purification. AirDoctor units are designed to meet this standard.
How often do I need to change the filters?
AirDoctor 4000 & 1000: Replace UltraHEPA® and Carbon/VOC filters every 6 months.
All other AirDoctor units:
Replace Carbon/VOC filters every 6 months.
Replace UltraHEPA® filters every 12 months.
The indicator light on your AirDoctor will also light on when it’s time to replace your filter
– no more guesswork!
What is your return policy?
We stand behind the quality of our products. That’s why we offer a 30-day money-back guarantee on all purchases. If for any reason you’re not completely satisfied with your AirDoctor, simply reach out to our friendly customer service team at 1-800-221-2515, and we’ll gladly issue you a full refund, minus shipping and processing fees.
Do you offer payment plans?
Yes! If you’re interested in a payment plan option, just select the Affirm payment option at checkout and follow the instructions. Terms and conditions apply.**
**Various purchase plans are available based on approval. Regretfully, Affirm is NOT available in Iowa or West Virginia due to state-specific financial regulations.
Can I use my HSA or FSA to buy AirDoctor products ?
Yes! We've partnered with Truemed to make it easy for you to get reimbursed for your AirDoctor products using your HSA or FSA funds.
To see if you qualify, follow the steps below after making your purchase:
1) Fill out the short intake form from Truemed to check your eligibility. You'll find the link to the form in your AirDoctor order confirmation email.
2) If approved, Truemed will email you a Letter of Medical Necessity within 24 hours.
3) Send this letter, along with your order confirmation receipt, to your HSA/FSA provider for reimbursement.
