Austin Air HealthMate HM400 Air Purifier

Air Purifiers

Austin Air HealthMate HM400 (B400)

Name: Austin Air HealthMate HM400 (B400)
Brand: Austin Air

#6 · Best Living-Area Unit for Multiple Smelly Pets

4.3 /10 Our score

Lowest verified price $845.00 Amazon

Our verdict

A niche choice for persistent, heavy odor in a living area. For most homes, a cheaper machine with an upgraded carbon filter is the more practical route.

Pros

About 15 lb of carbon and zeolite
Filter rated for up to 5 years
All-steel construction
No ionizer

Cons

Loud at its lowest speed
Low particle CADR for the price
High power draw
Very expensive, with no sleep mode or app

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Last reviewed October 31, 2026

Review

What to know about Austin Air HealthMate HM400 (B400)

An all-steel purifier with about 15 lb of activated carbon plus zeolite and a filter rated for up to 5 years. HouseFresh picks it for homes with multiple smelly pets because of that carbon mass. Particle CADR is low for the price (160 cfm PM1), and the lowest speed is loud for a bedroom (42.5 dBA).

Editorial notes

Why it stands out

Why we like it

Its roughly 15 lb of granular carbon and zeolite dwarfs every other pick, which is why HouseFresh recommends it for homes with multiple smelly pets. The filter is rated for up to five years, and the housing is solid steel with no ionizer.

What to know

It is not a bedroom purifier. It measures 42.5 dBA even at its lowest speed and has no sleep mode. Particle CADR is low at 160 cfm PM1, it draws up to 148 W, and it costs $845. The Amazon seller is a third party, so consider buying direct from Austin Air.

Performance

Score breakdown

Noise at sleep-usable speeds

Independently measured noise on low or sleep speeds (HouseFresh, Tom's Guide, RTINGS) and how much clean air the unit delivers at a sleep-tolerable level, roughly 45 dB or less. Brand dB claims count for less.

3.0

77 cfm PM1 under 45 dBA and a 42.5 dBA minimum (HouseFresh).

Cleaning performance for bedroom size

AHAM CADR and 4.8 ACH room rating versus a typical 150–400 sq ft bedroom, plus independent smoke and particle test results.

5.5

Weak particle CADR, but unmatched odor capacity.

Sleep-friendly features

Dedicated sleep or night mode, display that turns off or dims via a light sensor, no light leakage or beeps, auto mode that doesn't ramp up abruptly overnight, timer.

2.0

No sleep mode, sensor or app.

Indoor-air safety & materials

No ionizer, or one that can be switched off; CARB or zero-ozone verification; true mechanical HEPA versus electrostatic filtration; recalls or labelling disputes.

8.0

Steel housing, no ionizer, CSA approved.

Running cost & ownership

Annual filter cost, filter life, energy use, availability of genuine filters, warranty.

6.0

A $315 filter every up to 5 years, but power draw is high.

Value

Street price relative to quiet cleaning delivered for a bedroom.

4.0

$845 pays off only for heavy odor.

Specifications