Updated September 2026: I checked the current AirDoctor lineup, room coverage figures, smoke CADR ratings, dimensions, and list prices against the manufacturer’s product pages. Prices can change, so check the current offer before ordering.
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Quick answer
The AirDoctor 2000 is the sensible pick for a bedroom or home office. The AirDoctor 3500 is the best fit for most living rooms and larger bedrooms. The AirDoctor 4000 gives you a little more airflow in a narrower, taller body. The AirDoctor 5500 is the one to consider for a large open floor plan.
The smallest model, the AirDoctor 1000, makes more sense for a compact room or a spot where floor space is tight. It is not the budget choice at current list prices, though. The 2000 currently costs less and moves slightly more air.
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AirDoctor models compared
| Model | Best room | Coverage at 4 air changes per hour | Smoke CADR | Weight | Current list price |
|---|---|---|---|---|---|
| AirDoctor 1000 | Small bedroom, nursery, laundry room | 285 sq. ft. | 152 CFM | 10 lb. | $419 |
| AirDoctor 2000 | Bedroom, office, small living room | 305 sq. ft. | 162 CFM | 10 lb. | $399 |
| AirDoctor 3500 | Large bedroom, kitchen, living room | 630 sq. ft. | 340 CFM | 18 lb. | $659 |
| AirDoctor 4000 | Large room or open living area | 694 sq. ft. | 370 CFM | 15.8 lb. | $679 |
| AirDoctor 5500 | Extra-large room or open floor plan | 1,043 sq. ft. | 556 CFM | 33 lb. | $999 |
Coverage and CADR figures above come from AirDoctor. List prices were checked in September 2026 and may change.
How I would choose between them
Start with the room, not the biggest coverage number on the box. AirDoctor now lists coverage at four air changes per hour, which is a more useful comparison than a much larger one-change-per-hour figure. A purifier that turns the room’s air over several times per hour has a better chance of keeping up with smoke, dust, pollen, and pet dander entering the space.
Measure the room’s length and width, then multiply them to get square footage. If the ceiling is much higher than eight feet, choose with some spare capacity. Open doorways, stairwells, and connected kitchens also make a purifier work harder than a closed bedroom of the same floor area.
AirDoctor 1000: for the smallest rooms
The 1000 is 15.75 inches wide, 8.75 inches deep, and 23 inches tall. AirDoctor rates it for 285 square feet at four air changes per hour, with a smoke CADR of 152 CFM.
Its current $419 list price is awkward because the more powerful 2000 is listed at $399. I would choose the 1000 only if its shape suits the room better or a sale changes the price comparison. For most buyers choosing between these two, the 2000 is the better value.
AirDoctor 2000: best for a bedroom or office
The 2000 covers 305 square feet at four air changes per hour and has a smoke CADR of 162 CFM. It is the shortest model in this group at 18.72 inches tall, and it weighs 10 pounds. That makes it easier to place on a bedroom floor or move between smaller rooms.
Choose it for one closed room. Do not buy it for a large living room just because a slower air-change calculation produces a bigger coverage number. For a detailed head-to-head look, see our AirDoctor 2000 vs. 3500 comparison.
AirDoctor 3500: the best fit for most homes
The 3500 is the middle option that makes the most sense for many households. AirDoctor rates it for 630 square feet at four air changes per hour, with a smoke CADR of 340 CFM. I have used this model for years, and its size is still manageable in a living room or large bedroom.
It is not small. The unit is 23 inches tall and weighs 18 pounds. Still, it is much easier to fit into an ordinary room than the 33-pound 5500. Read my full AirDoctor 3500 review for the day-to-day positives and drawbacks.
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AirDoctor 4000: more airflow in a different shape
The 4000 sits close to the 3500 on price but has a higher smoke CADR of 370 CFM and a 694-square-foot rating at four air changes per hour. It is 28 inches tall, about 13.9 inches deep, and weighs 15.8 pounds.
The choice between the 3500 and 4000 is mostly about room size, shape, and filter schedule. The 4000 uses a combined replacement filter that AirDoctor says should be changed every six months. That can make its yearly filter bill higher than it first appears. Our AirDoctor 4000 review covers the model in more detail.
AirDoctor 5500: for a genuinely large space
The 5500 has a smoke CADR of 556 CFM and is rated for 1,043 square feet at four air changes per hour. It uses two UltraHEPA filters and two Carbon/VOC filters. It is also 33 pounds and takes up a 16-by-16-inch patch of floor space.
This is the right model for a large open plan, loft, or room with high ceilings. It is unnecessary for an average bedroom, where a smaller model costs less to buy and run. If your decision is between the two larger traditional models, read our AirDoctor 3500 vs. 5500 comparison.
What every current AirDoctor model has in common
The current models use three stages: a pre-filter, a Carbon/VOC filter, and an UltraHEPA filter. AirDoctor says the particle filter captures 99.99% of particles down to 0.003 microns in independent testing. That is a manufacturer claim about filter performance, not a promise that a unit will prevent illness.
All five models offer automatic fan adjustment based on the built-in air quality sensor. Smart versions add Wi-Fi and app controls. If you do not expect to use the app, compare the price of the Classic version before paying extra.
Do not forget filter costs
The purchase price is only part of the bill. The 2000, 3500, and 5500 use a Carbon/VOC filter every six months and an UltraHEPA filter about once a year, according to AirDoctor. The 1000 and 4000 use combined filters on a six-month schedule.
See our full AirDoctor filter cost guide for current prices and a simple yearly estimate.
My pick by room
- Small closed room: AirDoctor 2000
- Average bedroom: AirDoctor 2000
- Large bedroom or living room: AirDoctor 3500
- Large living area where a taller unit fits better: AirDoctor 4000
- Open floor plan or extra-large room: AirDoctor 5500
If I were buying one unit for a typical home and wanted it to work in more than one room, I would start with the 3500. For a bedroom that stays closed, I would save the money and buy the 2000.
