Best pick for your answerslarge rooms
#1 Levoit Core 400S-P Rank 1 of 12 air purifiers for large rooms in our ranking
Score 8.4 / 10 $189 white · incl. shipping · checked today
Air purifiers · Prices updated at 10:24 AM ET
The best air purifier for every budget in 2026
Every model with a known CADR ranked by measured facts and owners’ ratings, priced at 10 stores, shipping to the United States included.
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| Germ Guardian AC4825 × | |
|---|---|
| Price and ranking | |
| Lowest price | $99Germ Guardian (brand store) |
| Score | |
| Rank | rank 4 of 6 for small rooms |
| Customer rating | – |
| Room size | |
| Room size | small roomsup to 153 ft² |
| Size, noise and age | |
| How tall the purifier is. It decides whether it fits on a shelf or under a window sill. When it matters
| 22 in (55.9 cm) |
| On the market since | August 2024 |
| Smart features and warranty | |
| App control | None |
| Matter is the standard that lets devices from different makers work together. With it you can run the robot outside the maker’s own app. Matter | no |
| Cleaning performance | |
| How much clean air the purifier delivers an hour, measured with smoke, dust and pollen. A higher figure cleans a bigger room or the same room faster. Clean air delivery rate (CADR) | 99 cfm (168 m³/h) |
| The test the CADR comes from. AHAM AC-1 and the DOE test are independent and comparable. A maker's own test is not. CADR measured to | AHAM AC-1 (US standard) |
| The CADR measured with tobacco smoke, the finest of the three test particles. It is the figure to read for wildfire smoke. CADR for smoke | 99 cfm (168 m³/h) |
| The CADR measured with dust. CADR for dust | 116 cfm (197 m³/h) |
| The CADR measured with pollen. CADR for pollen | 129 cfm (219 m³/h) |
| The CADR measured for particles under 2.5 microns. CADR for fine particles (PM2.5) | 111 cfm (189 m³/h) |
| The room size where the purifier changes the air 4.8 times an hour under a 2.5 m ceiling, worked out from its CADR. We use it so every model is compared on the same rule. Room size we compare on | 151 ft² (14 m²) |
| The room size the maker states. Makers use different rules, so we show it but never rank on it. Room size the maker claims | 153 ft² (14 m²) |
| Filter | |
| How fine the filter is. True HEPA and H13 catch at least 99.97% of particles at 0.3 microns. HEPA-type is a weaker claim with no test behind it. HEPA filter class | True HEPA |
| Whether the particle and carbon layers are one filter or separate ones. Separate filters let you replace only the part that is spent. Filter layout | Separate filters |
| A filter of activated carbon that takes out smells and some gases. It does not catch particles. Activated carbon filter | yes |
| Replacement filter part number | FLT4825; FLT22CB4 |
| Running costs | |
| How long the maker says a filter lasts, in months of normal use. A filter that is spent cleans less. Filter life | 6 months |
| Noise and power | |
| The sound level at the lowest speed, as the maker measures it. Noise at the lowest speed | 40 dB |
| The sound level at the highest speed, as the maker measures it. Noise at the highest speed | 55 dB |
| The power the purifier draws at its highest speed. Power at the highest speed | 30 W |
| Air quality sensing | |
| What the purifier measures in the air. A particle sensor lets it speed up and slow down by itself. Air quality sensors | None |
| Particle sensor | None |
| Build | |
| Shape | Tower |
| Width | 171.5 mm |
| Depth | 260.4 mm |
| What the purifier weighs. It counts most if you move it from room to room. Weight | 8.6 lb (3.9 kg) |
| Extras | |
| An ioniser charges particles so they settle. Some also make a little ozone, which is why a switch to turn it off matters. Ioniser | None |
| Certified by the California Air Resources Board as making little ozone. CARB certified | yes |
| Warranty and certification | |
| The CADR is verified by AHAM, the US trade body that runs the test. AHAM Verifide certified | yes |
| The warranty the maker gives in the United States. Warranty | 3 years |
| Maker model numbers | AC4825 |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.
The score is out of 10: 60% measured facts and 40% store ratings. A model is ranked only when its CADR is known. Method.
Score 8.4 out of 10
large rooms Levoit Core 400S-P
$189$219 Discount as claimed by the store. We have not followed this store for the 30 days before the sale began, so we cannot verify the old price yet.How we work this out
Score 7.7 out of 10
Score 7.6 out of 10
Score 7.5 out of 10
Score 7.5 out of 10
Score 6.8 out of 10
open-plan spaces Blueair Blue Pure 211i Max
$262$349 Discount as claimed by the store. We have not followed this store for the 30 days before the sale began, so we cannot verify the old price yet.How we work this out
Score 6.5 out of 10
Score 5.3 out of 10
Score 5.1 out of 10
Score 4.7 out of 10
Score 4.4 out of 10
Lowest price at every store that ships to the United States, shipping included, before sales tax.
Robot vacuum market report, September 2026 A median price of – and 1 new model.
Frequently asked questions
What does a good air purifier cost in the United States?
The models in our ranking run from about $89 to $749 today. We show the lowest verified price of the day per model, shipping included, before sales tax.
How big an air purifier do I need?
Match it to the size of the room. Each model in the ranking is grouped by the room size its maker states, and the lists keep a model out when it states none. A common rule of thumb is a clean air delivery rate (CADR) of at least two thirds of the room’s floor area in square feet, for a ceiling of 8 feet.
What is the difference between HEPA H13 and True HEPA?
Both are high-efficiency filters. True HEPA is the American name for a filter that catches 99.97% of particles of 0.3 micrometres, and H13 is the European class for 99.95%. We read the class the maker states and do not treat a filter called HEPA-type or HEPA-like as either.
Can an air purifier make ozone?
Some can, mostly models with an ioniser or a plasma feature. California limits ozone from indoor air cleaners to 50 parts per billion, and the CARB certification shows a model meets that limit. Our asthma filter leaves out models whose ioniser cannot be switched off.
How often do you update the prices?
Every day, at every store we follow. We read the prices from the stores’ own product feeds and web stores. We check them for errors and keep them, so every product page shows what a price did over the last 90 days. We only call a discount real when the price also sits below the level of the preceding 30 days. We link to Amazon too, but show no Amazon price until we read it through Amazon’s own API. Until then the price is on Amazon itself. Per store: how and how often
Where we check prices
We read prices every day at most stores, from their product feed or web store. We check them for errors and keep them, so you can see what a price did over the last 90 days. We link to Amazon too, but show no Amazon price until we read it through Amazon’s own API. Until then the price is on Amazon itself.
- Alen (brand store) · United States
- Blueair (brand store) · United States
- Coway (brand store) · United States
- Germ Guardian (brand store) · United States
- Hathaspace (brand store) · United States
- Levoit (brand store) · United States
- Medify Air (brand store) · United States
- Molekule (brand store) · United States
- Rabbit Air (brand store) · United States
- Vornado (brand store) · United States
Whose tests we use
Beside each model we also show where these testers place it in their own lists, without counting it in the score:
How we combine measured facts and owners’ ratings into one score is on the method page.
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