The Best Air Purifiers Under $300
One bracket up from the budget tier, and the first one where you can buy 400-plus certified square feet without compromising on the ozone figure.
#ad We earn a commission if you buy through this link, at no extra cost to you. How this site is funded. Prices last checked September 23, 2026.
Under $300 is the first bracket where certified large-room coverage is available without an ion stage. The Core 600S is the most air — 391 CFM across 606 certified square feet at 0.00 ppb. The Blueair 311i Max is the cheapest to run. The Honeywell HPA6000 is the only one here recorded HEPA rather than HEPA-Type.
Price brackets are the least reliable way to rank air purifiers, because the prices move weekly and the certified numbers do not. So this page does it the other way around: every machine below was certified by AHAM or ENERGY STAR, has a live listing, and has recently sold in this bracket. They are ranked on what the registers publish, and the buttons carry today’s figure.
How we judged this bracket
Four criteria, applied before any price was looked at.
Certified CADR, not advertised coverage. Every figure here is from a register. Advertised coverage in this price range routinely runs four to five times the certified room size, because it is computed at one air change an hour rather than the 4.8 the certification uses.
Running cost, because the bracket is about money. A machine that costs $35 a year to run and one that costs $71 are a different proposition three years in, whatever the sticker said.
Measured ozone, stated for every pick. This bracket contains both zero-ozone machines and machines with an ion stage, and the registers do not always agree about which is which.
What the manufacturer publishes. Noise and filter cost decide whether a machine stays switched on and what it costs to keep running, and most of this bracket leaves both blank.
| Machine | Smoke CADR | Certified room | Electricity / yr | Ozone |
|---|---|---|---|---|
| LEVOIT Core 600S | 391 CFM | 606 sq ft | $71 | 0.00 ppb |
| Blueair Blue Pure 311i Max | 283 CFM | 439 sq ft | $35 | 2 ppb |
| Honeywell HPA6000 | 257 CFM | 398 sq ft | $38 | 0.00 ppb |
| Medify Air MA-40 | 245 CFM | 380 sq ft | $48 | 0.00 ppb |
| Blueair DustMagnet 5440i | 216 CFM | 335 sq ft | $40 | 1 ppb |
| Coway Airmega Mighty AP-1512HH | 233 claimed | 361 sq ft claimed | Not published | Not measured |
Electricity costs on this page use 18.34¢ per kWh, the U.S. average residential price for June 2026 from the U.S. Energy Information Administration, Electric Power Monthly, Table 5.3. Your rate is on your bill and is probably not this one; multiply the kWh figure by your own rate and you have your number.
What the step up from $200 actually buys
The honest answer is coverage and nothing else. Filter grade does not improve with price here: the HPA4300 at the bottom of the cheaper bracket is recorded HEPA, and three of the five machines in this one are recorded HEPA-Type. Measured ozone does not improve either — the zero-ozone machines exist in both brackets, and so do the ion-stage ones.
What the extra hundred dollars buys is square feet. 606 certified against 358 is 69% more room, which is the difference between a bedroom machine and a machine for an open living space. If your room is already inside the cheaper bracket’s coverage, spending more here buys headroom you will pay to run and never use.
What $300 does not buy
Certified coverage past about 600 square feet. The Core 600S tops this bracket at 606 square feet. Past that you are into the Coway Airmega 450 and ProX, which live in higher brackets — what happens when one machine cannot cover the space.
A published filter schedule, mostly. Of the five picks here, LEVOIT publishes a filter price without an interval and the rest publish neither. Filter cost is the half of the running bill this bracket keeps quiet about, and it is the half that compounds.
A washable pre-filter. Not one machine in this bracket documents one, which matters most in a house with a shedding animal — the machines that do document one sit either side of this price range.
Freedom from the ion question. Two of the five best-value machines here carry an ion classification from at least one register. You can buy a measured zero in this bracket, but you have to choose it deliberately.
How to check the bracket yourself
Prices in this category move faster than any editorial schedule, so the useful skill is checking a candidate rather than trusting a list. Three steps, each about a minute. Find the model number on the box — not the marketing name, the alphanumeric code. Search it in the ENERGY STAR or AHAM database and read the certified smoke CADR, the room size and, if ENERGY STAR lists it, the measured ozone. Then apply the two-thirds rule to your own room.
If the model is in neither register, you are buying the manufacturer’s word. That is the single most common outcome in this bracket, and it is why the best-selling machine in it is not a pick on this page.
Quick picks
Ranked on certified output, running cost and the ozone figure.
| # | Product | Best for | Certified CADR | Price |
|---|---|---|---|---|
| 1 |  Best under $300 LEVOIT Core 600S 391 certified CFM across 606 sq ft with 0.00 ppb measured ozone. | Large open-plan rooms | 391CFM smoke ENERGY STAR verified | |
| 2 |  Cheapest to run Blueair Blue Pure 311i Max 283 certified CFM across 439 sq ft at 8.4 CFM per watt. | Mid-size rooms on a small electricity bill | 283CFM smoke AHAM VERIFIDE | |
| 3 |  Best filter classification Honeywell HPA6000 257 certified CFM, recorded HEPA rather than HEPA-Type, 0.00 ppb. | Large living rooms, true HEPA | 257CFM smoke AHAM VERIFIDE |
#ad We earn a commission if you buy through this link, at no extra cost to you. How this site is funded. Prices last checked September 23, 2026.
The picks
LEVOIT Core 600S
LEVOIT · model Core 600S (LAP-C601S-WUS)
#ad We earn a commission if you buy through this link, at no extra cost to you. How this site is funded. Prices last checked September 23, 2026.
391 certified smoke CADR is real large-room capability, and it is honest about needing 387 kWh a year to deliver it — the highest electricity bill of any LEVOIT we cover.
391 smoke / 398 dust / 436 pollen CFM · 394 PM2.5
- Certified room size
- 606 sq ft
- Advertised coverage
- 2,909 sq ft at 1 air change per hour
- Energy / year
- 387 kWh
- Electricity / year
- $71
- Air per watt
- 6 CFM/W
- Power draw
- 49 W
- Noise
- 26-55 dB
- Measured ozone
- 0 ppb
- Filter class
- HEPA-Type
- AHAM rule, 550 sq ft
- Clears it (367 needed)
No ionizer — filtration only
ENERGY STAR classifies this unit 'Fan and Filter', 0.00 ppb measured ozone.
391 certified smoke CADR across 606 certified square feet, in both registers, with 0.00 ppb measured ozone and no ion stage. Nothing else in this bracket moves this much air, and LEVOIT publishes both a noise range and a filter price. The full record on it.
The honest con: $71 a year is the highest electricity bill in this bracket, 6 CFM per watt is mid-table, and the register classifies its filter HEPA-Type despite the 99.97% claim on the filter listing.
Blueair Blue Pure 311i Max
Blueair · model 3332111100 (Blue Pure 311i Max)
#ad We earn a commission if you buy through this link, at no extra cost to you. How this site is funded. Prices last checked September 23, 2026.
439 certified square feet on under 30 watts. The best power-to-coverage ratio at mid size, with the same ion-generator caveat as the rest of the Max range.
283 smoke / 314 dust / 365 pollen CFM · 298 PM2.5
- Certified room size
- 439 sq ft
- Energy / year
- 193 kWh
- Electricity / year
- $35
- Air per watt
- 8.4 CFM/W
- Power draw
- 29.6 W
- Noise
- Not published
- Measured ozone
- 2 ppb
- Filter class
- HEPA-Type
- AHAM rule, 400 sq ft
- Clears it (267 needed)
Ion generator — fitted
AHAM classifies this model 'Fan Filter with Ion Generator'; ENERGY STAR records 'Fan and Filter' with 2 ppb measured ozone.
283 certified smoke CADR across 439 certified square feet on 29.6 watts — $35 a year at 8.4 CFM per watt. Its certified pollen CADR of 365 is the largest gap over a smoke figure we have recorded. Our full review.
The honest con: ENERGY STAR measures 2 ppb rather than zero and AHAM classifies the Max range as carrying an ion generator, with no documented way to switch it off. Blueair publishes no noise figure and no filter schedule.
Honeywell HPA6000
Honeywell · model HPA6000B
#ad We earn a commission if you buy through this link, at no extra cost to you. How this site is funded. Prices last checked September 23, 2026.
More certified air movement than the HPA4300 for four more watts, and the same zero on ozone. The sensible step up if your room is nearer 400 square feet.
257 smoke / 262 dust / 285 pollen CFM · 259 PM2.5
- Certified room size
- 398 sq ft
- Energy / year
- 207 kWh
- Electricity / year
- $38
- Air per watt
- 7.3 CFM/W
- Power draw
- 34.9 W
- Noise
- Not published
- Measured ozone
- 0 ppb
- Filter class
- HEPA
- AHAM rule, 380 sq ft
- Clears it (254 needed)
257 certified smoke CADR across 398 certified square feet at 7.3 CFM per watt, 0.00 ppb measured, no ion stage — and the only machine in this bracket the register records as HEPA rather than HEPA-Type.
The honest con: it covers less room than the two above for similar money, and Honeywell publishes neither a noise figure nor a filter price we could source.
Medify Air MA-40
Medify Air · model MA-40-V4.0
#ad We earn a commission if you buy through this link, at no extra cost to you. How this site is funded. Prices last checked September 23, 2026.
Certified for 380 square feet with zero measured ozone. Middling efficiency, but a straightforward mechanical machine with nothing bolted on.
245 smoke / 257 dust / 263 pollen CFM · 250 PM2.5
- Certified room size
- 380 sq ft
- Energy / year
- 261 kWh
- Electricity / year
- $48
- Air per watt
- 5.6 CFM/W
- Noise
- Not published
- Measured ozone
- 0 ppb
- Filter class
- HEPA-Type
- AHAM rule, 350 sq ft
- Clears it (234 needed)
No ionizer — filtration only
ENERGY STAR classifies this unit 'Fan and Filter', 0.00 ppb measured ozone.
245 certified smoke CADR across 380 certified square feet with 0.00 ppb measured and nothing bolted on — no ion stage, no UV lamp. The full record on it.
The honest con: 5.6 CFM per watt is the weakest efficiency figure of the picks here, costing $48 a year, and the “H13 True HEPA” marketing sits on a filter the register classifies HEPA-Type.
Blueair DustMagnet 5440i
Blueair · model 5431112000 (DustMagnet 5440i)
#ad We earn a commission if you buy through this link, at no extra cost to you. How this site is funded. Prices last checked September 23, 2026.
The only unit here designed around where settled dust actually is — intake vents low on the body rather than on top. Its certified pollen CADR, 274, is its strongest number.
216 smoke / 231 dust / 274 pollen CFM · 227 PM2.5
- Certified room size
- 335 sq ft
- Energy / year
- 220 kWh
- Electricity / year
- $40
- Air per watt
- 5.9 CFM/W
- Power draw
- 37.3 W
- Noise
- Not published
- Measured ozone
- 1 ppb
- Filter class
- HEPA Type and Activated Carbon
- AHAM rule, 300 sq ft
- Clears it (200 needed)
Ion generator — fitted
AHAM classifies this model 'Fan Filter with Ion Generator'.
The only machine we cover built around where household dust actually is, with intakes low on the body rather than on top. Its certified pollen CADR of 274 is its strongest number, and it carries documented activated carbon.
The honest con: 216 CFM across only 335 certified square feet is the least coverage here, AHAM classifies it as carrying an ion generator, and ENERGY STAR measures 1 ppb.
The verdict
Common questions
What is the best air purifier under $300?
Is it worth spending more than $200 on an air purifier?
Do any air purifiers under $300 have zero ozone?
Are prices in this bracket stable?
Sources
- AHAM VERIFIDE directory of certified room air cleaners
- ENERGY STAR certified room air cleaners database
- AHAM — air filtration standards and the two-thirds rule
- EIA — average retail price of electricity
Figures were read on the dates shown against each source. If one has changed, or if we have got something wrong, tell us and we will correct the page.
Read next
- CADR & costThe Best Air Purifiers Under $200The certified machines that sat inside the bracket when we checked, ranked on air per watt rather than on sticker price.
- CADR & costWhat an air purifier costs to runCertified annual energy use converted to dollars for every unit, with the rate and its source stated.
- Room sizeThe Best Air Purifiers for Large RoomsCertified for 500+ square feet, ranked on real coverage and what each costs to run.