HomeReviewsAir Purifier ReviewsAirDoctor 3500 Air Purifier Review | More Effective Than Ordinary Air Purifiers

AirDoctor 3500 Air Purifier Review | More Effective Than Ordinary Air Purifiers

There are so many models of air purifiers out there that it can be a complicated decision to make, mainly if you have seen a few advertisements for them.

You have probably seen Air Doctor 3500 (Formerly Air Doctor Pro and Air Doctor 3000) air purifier ads on the web, social media, or TV. These ads claim it is among the best air purifiers on the market, outperforming most competitors.

Is that true?

I wanted to test this model to determine if it stands out, so I set up various real-life conditions to find that out.

Air Doctor sale Airdoctor sale best price buy now with 280 off AD3500

I found out that it is one of the best professional-quality air purifiers currently available – that’s what I can say after reviewing it. 

Best Air Doctor Pro Purifier Review

AirDoctor 3500i - Airdoctor with Wifi connected app


  • A high-quality air filtration operation
  • Auto sensor with an indicator for air quality
  • 24-hour timer
  • The strong fan has 4 speeds.
  • Extremely quiet when operating
  • Energy Star Certified


Air Doctor 3500 Design, Size

Design is subjective – one may like it, and another may dislike it. However, I think the Air Doctor AD3500 air cleaner has an excellent modern design.

It is 23.5” high, 16” wide, and 8.5” in depth. It has a “boxy” look about it, but rounded edges and corners make it blend into any space in your home, and it weighs around 20 pounds, which makes it easy to move around. I also like AirDoctor’s two-tone gray and white colors exterior. 

The machine has two vents in the front, drawing in the air before expelling it from the top when it is cleaned.

The air sensor is built-in on one side, and an indicator is on the front.

All control buttons are on the top of the unit; they are simple, with understandable symbols and instructions. More about each button can be read in the Key Features section

AIRDOCTOR 4-in-1 Air Purifier UltraHEPA controls


Usually, I recommend placing an air purifier closer to the pollution source. For example, place your AirDoctor next to your dog’s bed to trap pet dander.

If you don’t have any specific airborne particles you want to eliminate, you should place an air purifier closer to the middle of the room.

But the AirDoctor 3500 air purifier you can place everywhere in your room as it is powerful enough to suck air from every corner of your place.

Per the AirDoctor user manual, avoid placing your device closer than 1 foot from the walls, and don’t put it under direct airflow from a fan or AC. 

AirDoctor 3000 air purifier placement instructions

Also, check if the air inlet or outlet grill is not too close to the curtains or drapery.

How Does Air Doctor 3500 Work, And What Sources of Indoor Pollution Destroy?

Usually, most air purifiers use true-HEPA filters, and they can trap 99.97% of airborne particles in size of 0.3 microns, but Air Doctor does 99.97% as small as 0.003 microns in size.

So Air Doctor AD3500 can trap larger particles such as dust, pollen, mold spores, pet dander, and pet hair and capture the smallest ones – volatile organic compounds, viruses, and bacteria, including swine flu, enterovirus, etc. 

So you won’t have to worry about increasing the air quality in the room where you will use AirDoctor 3500 as it destroys plenty of indoor pollution.

Air Doctor 3000 filters

How is that possible?

Thanks to its purification system. The AirDoctor 3500 purifier uses a cleanable pre-filter, a Dual-action carbon/gas trap filter, and an UltraHEPA filter, independently tested to eliminate all microscopic particles floating around in the air.

Let’s take a closer look at the filters:

  • Pre-Filter. Its task is to trap the most extensive airborne particles, such as dust and hair, to extend the life of other internal filters. The pre-filter is cleanable and reusable. 
  • Carbon Filter (Gas Filter). As the name says, it removes gasses and not only. Carbon Filter also eliminates odors, volatile organic compounds, and dangerous ozone. Under regular use, it can serve for six months.
  • UltraHEPA filter. It captures 99.97% of 0.003-micron particles and 100% of 0.3-micron particles. So, literally everything.
  • Ionizer. It helps to remove smells and odors by sending negatively charged ions into the air.

So overall, AirDoctor 3500 air cleaner does an excellent job of cleaning the air. The central part that helps to reach such results is the UltraHEPA filter.

Few other machines have advanced filtration, but those are in another price category, work louder, are bulkier, and have fewer features, making AirDoctor stand out.

Read below in the Maintenance section for more about AirDoctor 3500 filters and the necessity to change the filters; read below in the Maintenance section.

Air Doctor 3500 Ion

What is ion on AirDoctor?

Nowadays, many air purifiers have an ionizer function, and AirDoctor 3500 is no exception. The ionizer electrically charges air molecules and is invented to help filter and remove microbes, aerosols, and other particles from the air. 

Does AirDoctor release ozone?

You are probably aware that ionizers produce ozone. And yes, also AirDoctor. 

But here is the good thing about AirDoctor 3500. It has been tested for this, and with Ionizer turned on, AirDoctor increased the ozone level insignificantly – only 0.001 ppm (Parts Per Million). 

To compare how low the amount is, the typical ozone level in the environment is higher than that. Specialists recommend that the upper limit should not exceed 0.05 ppm; as you can see, AirDoctor’s produced amount of ozone is far from that. 

So it is safe to use AirDoctor 3500 with an ionizer on, but if you still doubt that, you can turn it off any time with a push of a button. 

Turn On and Off AirDoctor 3000 Ionizer

Air Doctor 3500 Key Features

AirDoctor 3500 has the features you may need for your air purifier. Let’s take a look at them. 

Auto Mode

I must say this is a must feature nowadays. Let’s face it: Why would you want to check the air purifier or your air quality sensor several times a day if you can leave it on auto mode and let it do its job? 

AirDoctor 3500 has an auto mode, which works perfectly because it works with a built-in air quality sensor. So it reads the current air quality in your room and adjusts the fan speed automatically for you. 

Air Quality Sensor/Monitor

The air quality sensor and monitor work together – one makes measurements, and the other shows results. 

As I already wrote, an automatic air quality sensor monitors the air quality around you. To make it work, you need to switch to auto mode, and the air purifier will immediately adjust the correct filtration level based on the room’s current air quality.

It is illustrated as a colored circle on the face of the unit. The color tells you about the current air condition.

Air Doctor 3000 (Air Doctor Pro) Air purifier

  • Red color – Poor air quality, highest fan speed
  • Orange color – Moderate air quality, medium fan speed
  • Blue color – Good air quality, low fan speed

Overall, AirDoctor 3500 has 4 Fan speeds. Turbo, high, medium, and low settings for the fan. If you don’t want to use the auto mode, you can switch between fan speeds manually. 


AirDoctor 3500 has a 24-Hour Timer. You can set the amount of time you want the cleaner to run. It can automatically switch the unit off after 1 to 24 hours.

Filter Indicator Light

AirDoctor 3500 comes with two lights. One is for the UltraHEPA filter, and the second is for the Carbon filter. Lights alert you when the filter needs to be replaced.

Night Mode

Night mode dims the control panel so you can sleep better. It is a simple but necessary feature if you use AirDoctor in the bedroom. I have no problem sleeping with all lights on, but my wife would love this feature if we used this air purifier

Anything Missing?

AirDoctor 3500i - Airdoctor with Wifi connected app

Previously, I wrote that AirDoctor lacks a remote control or a connected app, but those times are gone. AirDoctor recently announced their new family member AD3500i, which is identical to AD3500, with a connected app. 

With the app, you can now see real-time air quality on your phone, filter change alerts, and all air purifier controls. 

Air Doctor 3500 Noise Level

Air Doctor is equipped with WhisperJet Fans; they are 30% quieter than other fans. 

The Air Doctor 3500 purifier will be ideal if you are searching for something quiet. It is quiet when the fans are on the low or medium settings, and the rate is around 39 dB. Anything below 40dB is considered to be quiet.

However, if the fans are turned on in the high or turbo settings, the noise level can increase to around 59 dB. That’s like an ordinary spoken conversation.

We can compare AirDoctor noise to that of other home appliances. For example, a refrigerator works with about 50dB of noise, an air conditioner 50-75dB, and a dishwasher 55- 70 dB.

Most appliances, such as vacuum cleaners, hair dryers, etc., are louder. 

Air Doctor 3500 Power Consumption

At the lowest fan speed, AirDoctor 3500 consumes only 11 watts; at the highest, it consumes 110 watts. That’s less than the industry’s average.

Remember that AirDoctor works only a few minutes on the highest fan speed and then switches to a lower one. So it doesn’t consume 110 watts all the time.

But if you have a 55” TV, you consume 116 watts every hour because that’s how much energy it takes. Let’s take, for example, another device – a desktop computer. Depending on its parameters, it consumes even more than 100-450 watts.

Let’s make a quick calculation. Let’s say you use AirDoctor 24/7, and the electricity cost is $0.12 per kWh, the average price in the USA.

These would be your costs per month

Speed 1 $0.87
Speed 2 $1.75
Speed 3 $3.94
Speed 4 $8.05

So you can easily let your AirDoctor 3500 run all day and night. It won’t drastically hurt your monthly electricity bills.

AirDoctor 3500 CADR, ACH, and Room Coverage

ACH And Room Coverage

ACH stands for air changes per hour, which means how often the air purifier can exchange all air in the room in one hour. 

Here is how many times per hour (ACH) and how large rooms Airdoctor 3500 can clean.

1 ACH (1x/hour) 2524 sq. ft.
2 ACH (2x/hour) 1262 sq. ft.
3 ACH (1x/hour) 841 sq. ft.
4 ACH (4x/hour) 631 sq. ft.
5 ACH (5x/hour) 505 sq. ft.

Usually, it is good to have the air cleaned at least 2-3 times every hour so that you can use AirDoctor 3500 for 850-1200 square feet in large rooms. 

If your air is very polluted, you might aim for 4-5x air changes per hour; in this scenario, you will be able to purify 500-630 square feet of large spaces with this air purifier.

How about competitors? Based on 5x air change per hour, AirDog X8 handles 600 sq. ft. but costs 3x more. Alen BreatheSmart 75i True HEPA Air Purifier covers 520 sq. ft. but also costs twice as much as the AirDoctor model.


You will also want to know about the ratings of the CADR or the Air Doctor 3500 purifier’s clean air delivery rate. This would be important since it can help you determine how effective it will be in your home.

Here are the CADR ratings that this air purifier has:

  • Smoke – 326 CFM
  • Pollen – 373 CFM
  • Dust – 343 CFM

Those numbers are above the industry average. As a result, AirDoctor 3500 will be highly effective in cleaning the air in the home of all dust, pollen, and smoke in small to medium-sized spaces. 

Air Doctor 3500 Maintenance and Upkeep

Best Air Doctor Pro Purifier ReviewHow Long Do the AirDoctor 3500 Filters Last?

You should also ensure that you are thinking about the upkeep and maintenance of the Air Doctor 3500 purifier.

The UltraHEPA filter needs to be replaced once per year, and the VOC/gas trap/carbon filter needs to be replaced every six months.

Filters change very quickly if you are following the user manual. 

You must clean the pre-filter every few months, soaking it in warm, soapy water and drying it before re-inserting it.

You can also extend the UltraHEPA and Carbon filter’s life by cleaning the pre-filter more frequently and saving money.

An indicator will turn on when the AirDoctor filters must be replaced, ensuring you have an additional one on hand to replace it immediately. 

How Do You Clean an AirDoctor Sensor?

The air sensor will need to be maintained and cleaned regularly, and you can figure out if it needs to be cleaned if the LED doesn’t change from one color to another. If it is, you need to unplug the purifier, find the panel door, and suction any dirt or dust out using a vacuum.

Overview of Air Doctor filters:

  • Pre-Filter. Clean regularly; it doesn’t need to be changed. 
  • Carbon filter. Replace once every six months. The replacement filters cost $59.95 per piece if you buy the original from AirDoctor. 
  • UltraHEPA filter. Replace once a year. The replacement filter costs $59.95 if you buy the original from AirDoctor. 

AirDoctor Filters’ life can be shorter or longer, depending on your air quality. But on average, you will have to spend about $90-$180 per year to maintain them.

Some may say that’s expensive, but in my experience, all good-performing air purifiers come with large, powerful filters and are not cheap. 

Air Doctor sale Airdoctor sale best price buy now with 280 off AD3500

People Also Ask

Does an Air Doctor 3500 come with filters?

Yes, it comes with filters. They are packed in protected plastic packaging. Just remove the packaging and quickly place them into the air purifier.

Does Air Doctor 3500 emit ozone?

The AirDoctor ionizer can increase ozone levels by a tiny amount, less than 0.005 ppm (parts per million). But by default, the ionizer is turned off, and while off, it emits no ozone.

Does the Air Doctor 3500 work?

Yes, it works. It is currently one of the most powerful air purifiers on the market, and it helps to improve overall indoor air quality.


Air Doctor Pro Review

If you are looking for an air purifier that will be simple, then the Air Doctor 3500 purifier is perfect. It requires very little maintenance, but it is also straightforward to operate, and there are 4 levels of fan usage.

It is very quiet and can clean an entire room of around 900 square feet at least 3 times every hour, which is excellent for the size.

I recommend this for you, especially if you live in a small apartment or RV and need something simple.

Those who want a WiFi-connected app version go for the AD3500i model. 

AirDoctor 3500 compared to AD1000, AD2000, and AD5500.

The Right AirDoctor Air Purifier For Hour Home

I have compared AirDoctor 3500 to other brands as well. Take a look at them:

If you need an air purifier for a smaller room, look at the AD1000 air purifier review or AirDoctor 2000 air purifier review, and if you need one for large spaces, look at the AD5500 air purifier review.

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