Both purifiers were checked on Amazon on October 16, 2026. Figures for design, noise and filter life come from the older reviews and the maker, and were not retested. The older claim that the filter kills viruses was removed.
The AirDoctor 3500 and the Hathaspace HSP002 are two large-room towers at very different prices. Here is how they compare and which one is worth it.
Table of Contents
AirDoctor 3500 vs Hathaspace HSP002 at a Glance
Both are floor towers for large rooms with a pre-filter, a carbon layer, a HEPA-type filter and an ion setting. The AD3500 is $559.00 on Amazon with a 4.7 rating from 485 ratings. The HSP002 is $299.99 with a 4.6 rating from over 3,200 ratings. The AirDoctor is lighter at about 18 pounds, against about 25 pounds for the Hathaspace.
Design and Controls
The AD3500 has rounded corners, a sensor light that changes color with the air quality, four fan speeds, an auto mode, a night mode, a timer and filter-change alerts. The Hathaspace has a touch-screen panel that shows the air quality score from 1 to 500, a timer for 2, 4, 6 or 8 hours and an auto mode. Our Hathaspace HSP002 review has the full details.
Filters
- AirDoctor AD3500. A washable pre-filter, a carbon and VOC filter, an UltraHEPA filter rated by the maker at 99.99 percent at 0.003 microns, and an optional ion setting.
- Hathaspace HSP002. A pre-filter, a carbon filter, a zeolite layer, an H13 HEPA filter rated at 99.95 percent, and an ion setting, per the older reviews.
Airflow, Noise and Room Size
The AD3500 listing says 630 square feet in 15 minutes, about 336 CFM, and the older page gave 326 CFM. The HSP002 is about 260 CFM, per the older review. For a 400 square foot room with an 8 foot ceiling, that is about 10 minutes per air change on the AirDoctor and 12 minutes on the Hathaspace. The AirDoctor reaches about 59 dB at the top speed, per an outside test, and the Hathaspace about 60 dB. See what CADR means.
Looking ahead, the gap between premium and mid-price large-room purifiers keeps shrinking. The AirDoctor AD3500 is $559.00 on Amazon, and the Hathaspace HSP002 is $299.99 with a similar airflow. The catch is that the premium unit sells on its filter name, while the cheaper one sells on a sensor and a screen.
4 Large-Room Air Purifiers to Compare
Prices and ratings were checked on Amazon on October 16, 2026.
Price on Amazon: $559.00 | 4.7 stars from 485 ratings (checked October 16, 2026)
The AirDoctor AD3500 is listed with UltraHEPA filtration rated at 99.99 percent of particles at 0.003 microns, and cleaning 630 square feet in 15 minutes. It has a 4.7 rating from 485 ratings.
Price on Amazon: $299.99 | 4.6 stars from 3,201 ratings (checked October 16, 2026)
The Hathaspace HSP002 is listed with a five-in-one filter system, an H13 HEPA filter, a smart air quality sensor and a touch-screen display. It has a 4.6 rating from over 3,200 ratings.
Price on Amazon: $229.99 | 4.6 stars from 29,229 ratings (checked October 16, 2026)
The Coway Mighty AP-1512HH is listed for up to 1,748 square feet with an air quality monitor, auto and eco modes and a 3-year warranty. It has a 4.6 rating from over 29,000 ratings.
Price on Amazon: $179.99 | 4.6 stars from 32,435 ratings (checked October 16, 2026)
The Winix 5510 is listed for up to 1,881 square feet in one hour with true HEPA, a carbon filter and app support. It has a 4.6 rating from over 32,000 ratings.
The risk to watch is the wording. The older page said the AirDoctor filter kills 99.95 percent of bacteria and viruses. A filter traps particles. It does not kill anything, and the percentage depends on the particle size. Both units also have an ion setting, which can make a little ozone. Expect more brands to sell lab-sounding filters and ionizers as add-ons. Judge by CADR, noise and filter cost, and keep the ionizer off.
Cost per Unit of Airflow
At $559.00 for about 326 CFM, the AirDoctor costs about $1.71 per CFM. At $299.99 for about 260 CFM, the Hathaspace costs about $1.15. Add filters: the Hathaspace needs a change about every six months, and the AirDoctor carbon filters every six months and the UltraHEPA once a year. Read the air purifier filter replacement cost guide before you buy.
Which Is Better?
The AirDoctor moves more air and has a stronger filter claim. The Hathaspace costs $259 less and adds a screen. For most large rooms, the Hathaspace or a Coway Mighty is the better value, and the AirDoctor is for buyers who want its filter and its quieter low settings.
FAQ
Which moves more air, the AirDoctor 3500 or the Hathaspace HSP002?
The AirDoctor, at about 326 CFM against about 260 CFM.
Does either one kill viruses?
No. Both trap particles on a filter. The older claim that the filter kills bacteria and viruses is not accurate.
Do they make ozone?
Both have an ion setting, which can make a little ozone. Keep it off.
Which costs less?
The Hathaspace HSP002 at $299.99, against $559.00 for the AirDoctor AD3500.
Final Word
The AirDoctor AD3500 is the stronger machine, but the Hathaspace HSP002 gets most of the way there for $259 less.
What happens next: expect both brands to add Wi-Fi and app control. Wi-Fi costs extra on the AirDoctor, in the AD3500i.
Related Guides
Keep going with AirDoctor vs Coway and air purifiers for large rooms.
