Honeywell HPA300 vs Medify MA-50 2026

CADR Comparison: Medify Leads Across All Three Metrics

Both units have AHAM-verified CADR — verifiable at ahamdir.com. The numbers are directly comparable.

Honeywell HPA300: CADR 300 smoke, 320 dust, 300 pollen. Room coverage: 465 sq ft.
Medify MA-50: CADR 352 smoke, 379 dust, 397 pollen. Room coverage: 1,100 sq ft.

The Medify MA-50 outperforms the HPA300 by 17-32% across all three CADR metrics. More strikingly, the AHAM-verified room coverage is 1,100 sq ft for the Medify versus 465 sq ft for the Honeywell — the Medify covers 2.4x more room area at comparable or lower price.

This is not a minor performance gap. The Medify MA-50 is a fundamentally more capable air purifier in every objective metric AHAM tests. Buyers expecting similar performance from two units in the same price range will find this difference significant. For a 465 sq ft room, the Medify MA-50 provides approximately 4.5 air changes per hour — enough headroom to run on medium speed most of the time while the Honeywell runs at high. For a 1,000 sq ft open plan, the Medify handles it adequately while the Honeywell struggles to deliver 1 ACH.

Noise: 13 dB Separates These Units — A Meaningful Real-World Gap

The Medify MA-50 runs at 22 dB at sleep/minimum speed. The Honeywell HPA300 runs at 35 dB. The 13 dB gap is the same order of magnitude as the Blueair vs Dyson difference — roughly 4-5x louder in perceived sound level. At 22 dB the Medify is at the threshold of human hearing in a quiet room. At 35 dB the Honeywell is audible as a persistent low hum.

The noise difference has a cause: the Honeywell HPA300 is an older design with a smaller, higher-RPM motor that must spin faster to move adequate air through the filter. Higher RPM at smaller diameter = more mechanical noise. The Medify MA-50 uses a larger, more modern motor design that moves the same or greater airflow at lower RPM with less noise.

For bedroom use — where many buyers intend to place their purifier overnight — this gap is decisive. The Medify at 22 dB allows uninterrupted sleep. The Honeywell at 35 dB on its lowest setting is the equivalent of a quiet refrigerator operating in the same room. Over 8 hours of sleep, this difference accumulates. For light sleepers or parents of young children, the Honeywell's noise floor is a significant practical problem that its CADR does not compensate for.

Energy Efficiency: 30 Fewer Watts for More Clean Air

Honeywell HPA300: 88 watts at maximum speed, CADR 320 dust. Medify MA-50: 58 watts at maximum speed, CADR 379 dust. The Medify delivers 18.5% higher CADR using 34% less electricity. This efficiency advantage is not marginal — it reflects fundamentally different engineering approaches.

The Honeywell HPA300 uses a high-CFM fan designed to push air through a dense HEPA filter at volume. High fan speed and high resistance requires significant motor power. The Medify MA-50 uses a more balanced airflow design that optimizes for lower resistance through the filter stage, allowing adequate airflow at lower wattage.

Practical impact: in auto mode running 24/7, the Honeywell averages approximately 35W and the Medify approximately 23W. Annual electricity cost difference: approximately $16 at $0.15/kWh. Over a typical 5-7 year product lifespan, this saves $80-112 in electricity. Combined with lower initial cost (when on sale, the Medify is priced comparably or lower), the total cost advantage of the Medify over the Honeywell is meaningful at any time horizon.

H13 HEPA vs True HEPA — The Filter Grade Difference

The Medify MA-50 uses H13 HEPA filtration. The Honeywell HPA300 uses True HEPA (standard grade).

Both True HEPA and H13 HEPA are defined by minimum efficiency at 0.3 microns — the MPPS (Most Penetrating Particle Size) — at 99.97%. The difference is in performance at smaller particle sizes. H13 maintains 99.97%+ efficiency at 0.1 microns, capturing ultrafine particles that the standard True HEPA standard does not certify performance for.

Why does this matter? Ultrafine particles below 0.3 microns include:

• Wildfire and wood smoke ultrafines (0.1-0.3 microns)
• Some viral particles in aerosol form
• Diesel exhaust PM0.1 (ultrafine)
• Some combustion byproducts

For buyers in wildfire-prone regions, near highways or with immunocompromised household members, H13 provides a meaningful additional safety margin that standard True HEPA does not certify. Both filters perform similarly in most residential scenarios — but for high-risk ultrafine particle exposure, H13 is the demonstrably better specification. The Medify MA-50 provides H13 at a price point where the Honeywell only offers standard HEPA.

Where the Honeywell HPA300 Still Makes Sense

There are three legitimate reasons to choose the Honeywell HPA300 over the Medify MA-50 today:

1. Same-day retail availability. The HPA300 is stocked at Target, Walmart, Costco, Home Depot and most major retailers. If you need an air purifier today — for a new wildfire event, smoke intrusion or sudden air quality emergency — the Honeywell is available off the shelf. The Medify requires 1-2 days for Amazon Prime delivery.

2. Existing Honeywell filter stock. If you already own an HPA300 and have purchased a supply of replacement filters, switching brands requires discarding that inventory. In this case, running the HPA300 to end of filter life before switching makes economic sense.

3. Specific models at large discount. The HPA300 occasionally appears at Costco and during sale events at significant discounts — $99-129 during clearance. At below-$130 pricing, the value proposition shifts. The Medify MA-50 rarely discounts below $160. If you encounter the HPA300 at a steep discount and do not need H13 or 1,100 sq ft coverage, the price gap may be sufficient reason to choose it.

Outside of these three scenarios, the Medify MA-50 is the objectively stronger choice at normal retail pricing.