Best Air Purifier for Mold in a Basement (2026): Spores, Sizes and the Step That Matters First

Mold is a moisture problem, so run a dehumidifier first: our basement pick is the Midea 50 Pint with Pump (MAD50P1AWS-A) ($276.70). Then add a true HEPA purifier for the spores in the air: the Dreo Macro Max AS ($149.99 on November 11, 2026), AHAM-certified for 456 sq ft.

Dreo Macro Max AS

Best for most basements

Dreo Macro Max AS

$149.99 on Amazon

Check price on Amazon
  • AHAM, the trade group that tests purifiers, certifies it for 456 sq ft. Its smoke CADR is 294: the cubic feet of air it cleans of fine particles each minute.
  • True HEPA filter. EPA: "Portable air cleaners and furnace/HVAC filters may remove some of the particles generated by mold."
  • On California's (CARB) list of air cleaners tested for ozone.
  • ENERGY STAR certified.
  • Genuine filter: $44.99, changed every 6–8 months by the maker's schedule: about $90 a year.
  • The cheapest of the 5 true HEPA purifiers certified for 400 sq ft or more that we could buy today.

Two steps, in this order

  • Step 1: dry the basement

    Midea 50 Pint with Pump (MAD50P1AWS-A) · Our top pick on the basement dehumidifier page

    EPA says the key to mold control is moisture control. This is the unit we pick for most basements, and why is on that page. See how we picked it.

    $276.70 on Amazon

  • Step 2, big open basement (up to 563 sq ft)

    Wozoyo Pure Air PA6 · AHAM: 563 sq ft · 363 smoke CADR · True HEPA + carbon · ENERGY STAR

    The cheapest true HEPA purifier AHAM certifies for 550 sq ft or more. It costs $100.00 more than the top pick. It is on the CARB ozone-tested list.

    $249.99 on Amazon

Prices are Amazon's on November 11, 2026. Room sizes are AHAM-certified. Smoke CADR is AHAM's clean-air rate for fine smoke particles, in cubic feet a minute.

By Erin Rose · Updated

01 / Moisture

Step 1: lower the moisture, because that is what mold lives on

EPA: "The key to mold control is moisture control." It tells you to keep indoor humidity below 60 percent, ideally between 30 and 50 percent, and to use air conditioners and dehumidifiers when needed.[1]

EPA also warns: "If you clean up the mold, but don't fix the water problem, then, most likely, the mold problem will come back."[1]

Our basement pick is the Midea 50 Pint with Pump (MAD50P1AWS-A) ($276.70 on November 11, 2026).

02 / Air

Step 2: a true HEPA purifier for the spores in the air

Spores float, and a true HEPA filter traps them. EPA: "Portable air cleaners and furnace/HVAC filters may remove some of the particles generated by mold." It adds that portable air cleaners "do not address the cause of mold and musty odors," which is why the dehumidifier comes first.[2]

A purifier cleans the air it pulls through the filter. It does not kill mold on a wall and it does not stop mold from growing. Pick one certified for at least the size of your basement.[2]

03 / Before you buy

What to check before you buy

  1. Fix the water first. Look for the leak, the wet wall or the gutter that dumps water against the foundation. A dehumidifier and a purifier manage the symptoms; the water is the cause.
  2. Measure the basement. Multiply length by width in feet. Buy a purifier whose AHAM-certified room size is at least that number. A basement with open walls and no doors needs the bigger size.
  3. Pick true HEPA. True HEPA is rated to catch 99.97 percent of 0.3 micron particles. Every pick here is true HEPA in AHAM's record.
  4. Skip ionizers and "plasma" modes. EPA: "Avoid portable air cleaners ... that intentionally produce ozone. Ozone is a lung irritant." Check the CARB tag on each pick before you buy.
  5. Price the filter. A true HEPA filter wears out. Over three years the filters can cost as much as the purifier, so we show the genuine filter's price where Amazon lists it.

04 / The full list

All 13 true HEPA purifiers certified for 250 sq ft or more

All 13 true HEPA purifiers certified for 250 sq ft or more: certified room size, smoke CADR, filter and Amazon price
PurifierRoom (sq ft)Smoke CADRFilterPriceBuy
Certified for 550+ sq ft
Wozoyo Pure Air PA6 563 363 True HEPA + carbon $249.99 Buy
Certified for 400 to 549 sq ft
Dreo Macro Max ASsold by Amazon 456 294 True HEPA $149.99 Buy
Winix T810sold by Amazon 418 270 True HEPA $175.99 Buy
Winix AT40sold by Amazon 410 265 True HEPA + carbon $192.57 Buy
Whirlpool WPPRO2000 529 341 True HEPA $349.99 See Winix 9800 on Amazon
Certified for 250 to 399 sq ft
Honeywell HPA4300Bsold by Amazon 354 229 True HEPA $158.11 Buy
Winix C610 384 248 True HEPA $176.49 Buy
Winix 5510sold by Amazon 392 253 True HEPA + carbon $179.99 Buy
Winix 5520sold by Amazon 392 253 True HEPA + carbon $179.99 See Winix AT40 on Amazon
Winix 5530sold by Amazon 392 253 True HEPA + carbon $219.99 See Winix AT40 on Amazon
GermGuardian AC3200sold by Amazon 348 225 True HEPA $229.99 Buy
GermGuardian AP3250sold by Amazon 345 222 True HEPA $229.99 Buy
GermGuardian AC3250sold by Amazon 347 224 True HEPA $239.99 Buy

Room size and smoke CADR are AHAM-certified. Prices read live November 11, 2026.

05 / Questions

Frequently asked

Will an air purifier get rid of mold in my basement?
No. It catches mold spores that float in the air; it does not remove mold growing on walls or floors, and it does not stop new growth. EPA says that if you clean up mold but do not fix the water problem, the mold will most likely come back. Dry the basement first.
What humidity should a basement be to stop mold?
EPA says to keep indoor humidity below 60 percent, ideally between 30 and 50 percent. A dehumidifier is how most people do that in a basement.
What is the best dehumidifier to pair with the purifier?
Our basement pick is the Midea 50 Pint with Pump (MAD50P1AWS-A), $276.70 on November 11, 2026. It is the top pick on our basement dehumidifier page, which explains the test numbers and the other sizes.
What size air purifier do I need for a basement?
Pick by the room size AHAM certifies, and measure your basement. The Dreo Macro Max AS is certified for 456 sq ft; the Wozoyo Pure Air PA6 covers up to 563 sq ft.
Do I need a HEPA filter for mold spores?
A true HEPA filter is the right kind. EPA: "Portable air cleaners often achieve a high CADR by using a high-efficiency particulate air (HEPA) filter." And: "Portable air cleaners and furnace/HVAC filters may remove some of the particles generated by mold."
How much do the filters cost?
For the Dreo Macro Max AS, the genuine filter is $44.99 on Amazon today and lasts 6 to 8 months by the maker's schedule: about $90 a year.

References

Sources

5 references · prices on November 11, 2026
  1. 1

    U.S. EPA: A Brief Guide to Mold, Moisture, and Your Home

    Read November 3, 2026. "If possible, keep indoor humidity below 60 percent (ideally between 30 and 50 percent) relative humidity."

  2. 2

    U.S. EPA: Guide to Air Cleaners in the Home

    Read November 3, 2026. "Portable air cleaners and furnace/HVAC filters may remove some of the particles generated by mold."

  3. 3

    AHAM Verifide directory of certified room air cleaners

    Smoke CADR, certified room size, filter type and ENERGY STAR for every purifier on this page.

  4. 4

    California Air Resources Board: list of CARB-certified air cleaning devices

    Certification covers ozone (0.050 ppm limit) and electrical safety, not cleaning performance.

  5. 5

    Amazon listings: price, seller and stock

    Read live on November 11, 2026. A price shows only if the listing could be bought that day.