AirDoctor is launching its newest air purifying system, the AirDoctor 4000, with a $400 pre-order discount that brings the price down from the regular $800 tag.
At a Glance
- Pre-order the AirDoctor 4000 and save $400 instantly
- Grab 15% off filter combo packs without a promo code
- The AirDoctor 3500 is now $409, down from $659
- Why it matters: Clean-air tech is getting cheaper just as wildfire and allergy seasons intensify
The COVID pandemic and record-setting wildfires have turned air purifiers into must-have home gear. Every building pulls in particulate matter, volatile organic compounds, and vaporous chemicals, while indoor plastics, furniture, and paint add their own off-gassing. Cleaner air means fewer coughs, milder allergies, clearer sinuses, and less scratchy throats-benefits AirDoctor targets across its lineup.
Biggest Launch Deal: $400 Off AirDoctor 4000
AirDoctor is positioning the 4000 as its new flagship. The unit sports a 360-degree air-intake design and triple filtration that traps 99.99% of particles including allergens, smoke, mold, and bacteria. The pre-order window is open now; no code is needed-the $400 savings apply automatically at checkout.
Cut Long-Term Costs: 15% Off Filter Combo Packs
Replacement filters add up, so AirDoctor is pushing combo packs. Buying in bulk knocks 15% off the total cost versus individual filters. The discount activates once the pack hits the cart, making it one of the simplest ways to lower ownership expenses.
Medium-Room Powerhouse: AirDoctor 3500 Now $409
The AirDoctor 3500, an award-winning best-seller, is down to $409 from the usual $659. Key specs:
- Coverage: 630 sq ft cycled 4× per hour
- Filtration: 3-stage system with UltraHEPA
- Add-on: Smart Wi-Fi upgrade available
What AirDoctor Purifiers Actually Do
Beyond the obvious smoke and pet dander, AirDoctor units tackle finer pollutants. The Smart 5500i, for example, pairs HEPA filters for PM 2.5 with dual-action carbon filters for gases and VOCs, exchanging air four times an hour in a 1,000-sq-ft space. A filter-change alert keeps maintenance on schedule.
Best Pick for Mold & Pet Homes
The 3500 earns high marks for mold spores and pet dander. Its rapid circulation-630 sq ft four times per hour-helps control odors in bedrooms, living rooms, or kitchens. The sealed 3-stage UltraHEPA system captures the microscopic particles that trigger allergies.
How to Choose the Right Unit
Match room size to CADR rating first; then weigh extras like Wi-Fi or gas filters. Measure your space, check ceiling height, and note pollution sources (pets, wildfire zone, newly painted walls) before buying.

Key Takeaways
- AirDoctor is cutting $400 off the 4000 model during pre-orders
- Filter combo packs are 15% off with no code required
- The 3500 drops to $409, ideal for medium-to-large rooms
- All units target 99.99% particle removal, including mold, bacteria, and smoke
These deals are live now on the company’s site and stack with free shipping on most orders.

