Head to head

Alen BreatheSmart 75i Large Room Air Purifier vs Honeywell HPA300 HEPA Air Purifier

Alen BreatheSmart 75i Large Room Air Purifier leads 4 to 1 on the 5 rankable specs, but Honeywell HPA300 HEPA Air Purifier costs $500 less.

Catalog as of September 1, 2026

Why, in numbers

CADR: Alen BreatheSmart 75i Large Room Air Purifier lists 350 CFM across Smoke, Dust, Pollen (Alen sheet, 2026-09-02); Honeywell HPA300 HEPA Air Purifier lists 300 CFM (Smoke), 320 CFM (Dust), 300 CFM (Pollen) (Honeywell sheet, 2026-09-02).
Coverage area: Alen BreatheSmart 75i Large Room Air Purifier lists 1,400 sq ft (2 air changes/hr) / 700 sq ft (4 air changes/hr) (Alen sheet, 2026-09-02); Honeywell HPA300 HEPA Air Purifier lists 465 sq ft (4.8 air changes/hr) / 2,250 sq ft (1 air change/hr) (Honeywell sheet, 2026-09-02).
Room size: Alen BreatheSmart 75i Large Room Air Purifier lists Large master suites, open living rooms, offices (Alen sheet, 2026-09-02); Honeywell HPA300 HEPA Air Purifier lists Extra large rooms, master suites, open spaces up to 465 sq ft (4.8 ACH) (Honeywell sheet, 2026-09-02).
Filter types: Alen BreatheSmart 75i Large Room Air Purifier lists Medical-grade H13 True HEPA + Antimicrobial layer + Heavy Odor Carbon (Alen sheet, 2026-09-02); Honeywell HPA300 HEPA Air Purifier lists Type A Activated Carbon Pre-filter + 3× Type R True HEPA filters (Honeywell sheet, 2026-09-02).
Filter life: Alen BreatheSmart 75i Large Room Air Purifier lists 12–15 months extra long filter life (Alen sheet, 2026-09-02); Honeywell HPA300 HEPA Air Purifier lists 3 months (Pre-filter) / 12 months (True HEPA filters) (Honeywell sheet, 2026-09-02).

Manufacturer list price, not a live offer. Confirm current pricing before you buy.

Alen BreatheSmart 75i Large Room Air Purifier

$7494 spec wins

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Honeywell HPA300 HEPA Air Purifier

$2491 spec win

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Buying for

Every rankable spec counts once. Pick a lens to score only what matters for your air purifier.

Straight answer

Overall: 4 to 1

Buy the Alen BreatheSmart 75i Large Room Air Purifier.

Leads 4 of 5 rankable overall specs; Honeywell HPA300 HEPA Air Purifier takes 1.
CADR: 350 CFM across Smoke, Dust, Pollen vs 300 CFM
Coverage area: 1,400 sq ft vs 465 sq ft
Honeywell HPA300 HEPA Air Purifier is $500 cheaper. Pay the difference only if cadr matters to you.

Check first: the Alen BreatheSmart 75i Large Room Air Purifier weighs over 25 lb (11 kg). Tick them under deal-breakers if that rules it out.

4 Alen BreatheSmart 75i Large Room Air Purifier5 rankable of 11 specsHoneywell HPA300 HEPA Air Purifier 1

Deal-breakers

tick what would make you walk away

Over 55 dB on highrow
Louder than normal conversation at full speed.
Clear:Alen BreatheSmart 75i Large Room Air Purifier · 25 dB (WhisperMax) – 49 dB (Turbo speed)Trips:Honeywell HPA300 HEPA Air Purifier · 38 dB (Low) – 58 dB (Turbo)
Under 1,000 sq ft coveragerow
Undersized for an open-plan living area.
Clear:Alen BreatheSmart 75i Large Room Air Purifier · 1,400 sq ftTrips:Honeywell HPA300 HEPA Air Purifier · 465 sq ft
Over 25 lb (11 kg)row
Hard to move between rooms.
Trips:Alen BreatheSmart 75i Large Room Air Purifier · 27.0 lbClear:Honeywell HPA300 HEPA Air Purifier · 17.0 lb

At a glance

The handful of numbers that decide most purchases in this category.

2 of 2 differ

CADR

Alen

350 CFM across Smoke, Dust, Pollen

Honeywell

300 CFM (Smoke), 320 CFM (Dust), 300 CFM (Pollen)

Coverage area

Alen

1,400 sq ft (2 air changes/hr) / 700 sq ft (4 air changes/hr)

Honeywell

465 sq ft (4.8 air changes/hr) / 2,250 sq ft (1 air change/hr)

True 3-Year Cost of Ownership (TCO)

Upfront price + 3 years of consumables, fees & essential add-ons

Alen BreatheSmart 75i Large Room Air Purifier

Upfront list price$749

3-Yr B6-Pure heavy HEPA filter (Every 12–15 months (~$99/yr))+$297

3-Year Estimated Total$1,046

Honeywell HPA300 HEPA Air Purifier

Upfront list price$249

3-Yr 3x HRF-R3 HEPA + 4x Pre-filters (Annual full filter set (~$65/yr))+$195

3-Year Estimated Total$444

Room Placement & Bedroom Noise Check

Physical clearance required for airflow, wall placement, and bedroom noise levels.

Ergonomic & Spatial Check

Wall Clearance Required

Cylindrical 360° filters cannot sit flush against walls without choking intake.

Alen

Requires 12 in perimeter airflow space

Honeywell

Front grille intake: can back up close to baseboards

Nighttime Sleep Mode Noise

Levels below 25 dB are virtually silent for light sleepers.

Alen

Standard sleep speed

Honeywell

30 dB lowest fan speed (noticeable background white noise)

Unit Footprint & Dimensions

Alen

Standard room purifier footprint

Honeywell

Large commercial-grade shell (20.8 × 22.3 × 10.8 in; 17.0 lb)

The 90-Day Owner Regret Check

Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.

Post-Purchase Truths

Alen: What to watch for

Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Activated carbon and HEPA media gradually saturate, needing replacement once or twice yearly depending on air pollution and pet shedding.

Honeywell: What to watch for

Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Activated carbon and HEPA media gradually saturate, needing replacement once or twice yearly depending on air pollution and pet shedding.

Alen BreatheSmart 75i Large Room Air Purifier$7494 wins

Honeywell HPA300 HEPA Air Purifier$2491 win

Performance Filters Usability & Smart Design & Ownership

11 of 11 attributes differ. Identical rows are dimmed.

Performance

leads 2-0

Performance specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Honeywell HPA300 HEPA Air Purifier.
CADR	350 CFM across Smoke, Dust, Pollen (wins this row: higher)	300 CFM (Smoke), 320 CFM (Dust), 300 CFM (Pollen)
Room size	Large master suites, open living rooms, offices	Extra large rooms, master suites, open spaces up to 465 sq ft (4.8 ACH)
Coverage area	1,400 sq ft (2 air changes/hr) / 700 sq ft (4 air changes/hr) (wins this row: higher)	465 sq ft (4.8 air changes/hr) / 2,250 sq ft (1 air change/hr)

Filters

leads 1-0

Filters specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Honeywell HPA300 HEPA Air Purifier.
Filter types	Medical-grade H13 True HEPA + Antimicrobial layer + Heavy Odor Carbon	Type A Activated Carbon Pre-filter + 3× Type R True HEPA filters
Filter life	12–15 months extra long filter life (wins this row: higher)	3 months (Pre-filter) / 12 months (True HEPA filters)

Usability & Smart

leads 1-0

Usability & Smart specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Honeywell HPA300 HEPA Air Purifier.
Noise levels	25 dB (WhisperMax) – 49 dB (Turbo speed) (wins this row: lower)	38 dB (Low) – 58 dB (Turbo)
Energy consumption	45 W (Energy Star certified)	130 W max power consumption
Smart features	Alen Air App (Wi-Fi), auto modes, color ring status	No (manual touch controls with 2/4/8 hr auto-off timer)
Air quality sensors	Laser air quality sensor detecting fine particle levels with 5 color rings	No automated air quality sensors (filter replacement indicators)

Design & Ownership

leads 1-0

Design & Ownership specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Honeywell HPA300 HEPA Air Purifier.
Weight	27.0 lb (12.2 kg)	17.0 lb (7.7 kg) (wins this row: lower)
Warranty	Lifetime warranty (with active filter subscription)	5 years manufacturer limited warranty

Most rows are from the official spec sheet. Marked rows are other published figures or our summary, not lab tests we ran.

Alen BreatheSmart 75i Large Room Air Purifier source Honeywell HPA300 HEPA Air Purifier source

Which one should you buy

Pick this one if

Alen BreatheSmart 75i Large Room Air Purifier

Commercial-grade quiet purifier cleaning up to 1,400 sq ft every 30 minutes with a lifetime warranty.

Industry-exclusive transferable Lifetime Warranty
Tuned pink noise frequencies promote deeper sleep on WhisperMax mode
Medical-grade H13 True HEPA filter lasts up to 15 months

What you give up

High initial investment
Tall tower profile

Full Alen BreatheSmart 75i Large Room Air Purifier specs →

Pick this one if

Honeywell HPA300 HEPA Air Purifier

Extra-large room True HEPA air purifier with Turbo Clean mode, dual-stage filtration, and AHAM Verifide CADR ratings for large rooms.

Powerful high-volume CADR (300+ CFM) for large rooms up to 465 sq ft
Certified True HEPA captures 99.97% of airborne particles
Durable workhorse build with touch-button controls

What you give up

High power consumption (up to 130W on Turbo)
No Wi-Fi app or smart automated air quality sensors

Full Honeywell HPA300 HEPA Air Purifier specs →

Best for each use

Bedrooms

Quiet nights: low-speed noise, sleep mode, schedules from your phone

Tied on bedrooms. Honeywell HPA300 HEPA Air Purifier is cheaper.

The 2 rankable bedrooms specs split 1 to 1.
Saves $500 at list price.

Big rooms & allergies

Open-plan rooms or allergies: CADR, coverage, filter grade

For big rooms & allergies, buy the Alen BreatheSmart 75i Large Room Air Purifier.

Leads 3 of 3 rankable big rooms & allergies specs.
CADR: 350 CFM across Smoke, Dust, Pollen vs 300 CFM
Coverage area: 1,400 sq ft vs 465 sq ft
Honeywell HPA300 HEPA Air Purifier is $500 cheaper. Pay the difference only if cadr matters to you.

Low running cost

Cheap to own: filter life, power draw, warranty

Too close to call on low running cost from the spec sheets. Only filter life is rankable here.

Energy consumption: 45 W vs 130 W max power consumption
Warranty: Lifetime warranty vs 5 years manufacturer limited warranty

Every answer above is scored from published figures. A lens uses only the rows that matter for that use, including marked rows that are not on the official sheet. Switch lenses interactively in the panel above.

Done deciding?

Open the full standalone spec sheet for either device.

Alen BreatheSmart 75i Large Room Air Purifier spec sheet Honeywell HPA300 HEPA Air Purifier spec sheet

Manufacturer pages: Alen BreatheSmart 75i Large Room Air Purifier ↗ · Honeywell HPA300 HEPA Air Purifier ↗

Common questions

Which is cheaper, the Alen BreatheSmart 75i Large Room Air Purifier or the Honeywell HPA300 HEPA Air Purifier?

Honeywell HPA300 HEPA Air Purifier costs $500 less at list price.

What is the biggest catch with the Alen BreatheSmart 75i Large Room Air Purifier or Honeywell HPA300 HEPA Air Purifier?

Honeywell HPA300 HEPA Air Purifier has this deal-breaker: over 55 dB on high. Louder than normal conversation at full speed.

Which is better for bedrooms, the Alen BreatheSmart 75i Large Room Air Purifier or the Honeywell HPA300 HEPA Air Purifier?

Tied on bedrooms. Honeywell HPA300 HEPA Air Purifier is cheaper. The 2 rankable bedrooms specs split 1 to 1. Saves $500 at list price.

What cannot be compared from spec sheets?

Of the 11 specs tracked here, 6 are descriptive and cannot be ranked on numbers alone. Spec sheets also cannot measure subjective factors like build quality, real-world performance, or comfort.

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