Is the Honeywell HPA300's CADR AHAM-verified, and does it emit ozone?

Its 320 cfm Clean Air Delivery Rate is AHAM-verified - independently tested, not a box claim. It has no ionizer and no ozone-generating stage.

Do I have to buy three HEPA filters at once?

Yes. The HPA300 holds three Filter R units side by side, so a full HEPA replacement means a set of three (the HRF-R3 pack).

Does it have an air quality sensor or auto mode?

No. The HPA300 is a manual-control unit with cleaning-level buttons and a timer; it has no air quality sensor or sensor-driven auto mode.

Air purifier · large-room

Honeywell HPA300

Name: Honeywell HPA300
Brand: Honeywell

A no-ozone True HEPA purifier for large rooms using three HEPA filters, AHAM verified and Energy Star certified.

5.0/ 10

Limited

Composite (0-10), air-v1.0

Confidence: Verified

Bottom line

In our scoring the Honeywell HPA300 earns 5.0/10, a weak result, and it stands out on safety (8.0/10). On the data, its 320 cfm CADR is AHAM-verified. Filters run about $154 a year (~$1038 over five years with the device), on the expensive end to run. Its weakest area in our scoring is total cost of ownership (0.0/10).

Where to buy

No buy link on this one: it scored Limited under our rubric, and we only link products we would shortlist ourselves.

Total cost of ownership

Checked 45 days ago

Annual filters: $154/yr
Device: $269
5-year total: $1038

Which cartridge fits, and where to reorder it

Certifications

ANSI/AHAM AC-1smoke, dust, pollen
Energy Star Room Air Cleanersefficiency

Filters only protect you on their swap schedule. Get an email reminder when this one is due - one note around swap time, nothing else.

Overview

The Honeywell HPA300 is a large-room air purifier built around a True HEPA filter. Its Clean Air Delivery Rate is AHAM-verified at 320 cfm, and it uses no ionizer and no ozone-generating stage. Filters run about $154 per year, on the expensive end to run.

By the numbers

Clean Air Delivery Rate: 320 cfm (AHAM-verified)
Real coverage at 4.8 ACH: ~496 sq ft
Manufacturer room claim: 465 sq ft
Filter: True HEPA
Ozone / ionizer: no ionizer and no ozone-generating stage
Noise (low): 41 dBA
Annual filter cost: $154/yr
5-year cost of ownership: $1038 (device + filters)
Certifications: ANSI/AHAM AC-1, Energy Star Room Air Cleaners

Strengths

+ Safety: 8.0/10

Watch-outs

- Total Cost of Ownership: 0.0/10

Who it is for

· Large living rooms and open-plan spaces
· Anyone sensitive to ozone, or with asthma or allergies

Who should skip it

· Buyers focused on low running cost - filters are pricey

What to know before buying

· The HPA300 uses three Filter R True HEPA filters (sold as set HRF-R3) replaced about yearly, plus a carbon pre-filter (HRF-AP1) cut to size and replaced about every three months.
· It is rated for about 465 sq ft, among the largest in its class, driven by a large fan and four settings including a Turbo mode.
· The Turbo setting is loud, measured in reviews in the roughly 60 to 65 dB range.

How it scored

Verified Performance

7.0/10 · 30%

AHAM CADR, true sealed HEPA, air changes per hour, honest room-size match.

+3AHAM Verifide CADR published A320 cfm (AHAM Verifide) - CADR is third-party verified by AHAM, not a manufacturer claim.
+2Hits ~5 air changes/hour at rated room B5.2 ACH at 465 sq ft - Delivers at least 4.8 air changes per hour at its rated room size.
+2Honest room-size claim Brated 465 sq ft, CADR supports 496 - Claimed room size is within what the unit's own CADR can clean.

Total Cost of Ownership

0.0/10 · 25%

Computed annual filter cost vs the room-size class median. The number nobody surfaces.

0Annual filter cost vs class median A$153.75/yr (above class median (expensive to run)) - Computed annual filter cost scored against the room-size class median.

Certification

5.0/10 · 15%

AHAM Verifide, Energy Star, CARB, published lab efficiency.

+2Energy Star certified AEnergy Star - Energy Star certified for energy efficiency.
+3Published lab-tested efficiency AAHAM-listed CADR - Filtration performance is independently lab-tested and published.

Safety

8.0/10 · 15%

Ozone and ionizer behavior. Ozone generators hard-fail.

+8No ozone-generating technology Ano ionizer / no ozone - No ionizer, plasma, or ozone-emitting stage.

Practical Fit

6.0/10 · 15%

Noise, filter-change indicator, energy draw. Smart features are neutral.

+4Quiet at low speed B41 dBA low - Runs at 50 dBA or quieter on its lowest useful speed.
+2Filter-change indicator Bindicator present - Tells you when the filter actually needs replacing.
·Smart features (neutral) Capp / auto mode - App control and auto mode are neither rewarded nor penalized.

FAQ

Is the Honeywell HPA300's CADR AHAM-verified, and does it emit ozone?: Its 320 cfm Clean Air Delivery Rate is AHAM-verified - independently tested, not a box claim. It has no ionizer and no ozone-generating stage.
Do I have to buy three HEPA filters at once?: Yes. The HPA300 holds three Filter R units side by side, so a full HEPA replacement means a set of three (the HRF-R3 pack).
Does it have an air quality sensor or auto mode?: No. The HPA300 is a manual-control unit with cleaning-level buttons and a timer; it has no air quality sensor or sensor-driven auto mode.

Related guides

This score is our opinion under our published rubric, not a statement of objective fact or a lab test of this product. We score what third-party certifications prove; absence of a certification means we found no verification, not that a product fails to perform. Last reviewed 2026-05-29. Scored under air-v1.0. Prices were last checked 45 days ago; the freshness chip above the cost panel shows the current state. See the methodology for how each rule fires.