What's the difference between the Honeywell HPA100 and HPA300?

Cleaning power and size. The HPA100 delivers 120 CFM — right for a bedroom up to ~190 sq ft. The HPA300 delivers 300 CFM — for large rooms up to ~465 sq ft. Same filtration approach (True HEPA + carbon), same manual controls, same washable pre-filter. The HPA300 is bigger, louder on max, and costs about $120 more. Choose by room size, not by anything else.

Which Honeywell purifier is better: HPA100 or HPA300?

Whichever matches your room. The HPA100 is better for bedrooms and small spaces (120 CFM, quieter, cheaper, smaller footprint). The HPA300 is better for living rooms and open plans (300 CFM). The 'better' unit is the one that cleans your actual room at the right speed — a HPA300 in a bedroom is overkill; a HPA100 in a living room is useless.

How much does the HPA300 cost vs the HPA100?

The HPA300 typically runs $249 vs $129 for the HPA100 — roughly double. The price tracks the cleaning power: 2.5x the CADR for 2x the price, which makes the HPA300 actually the better value per CFM. Filters cost the same per change (both ~$25-35), but the HPA300's last the same 6-12 months while cleaning far more air.

Are the HPA100 and HPA300 filters the same?

No — they use different filter sizes (the HPA300's is bigger, matching its bigger fan). They cost about the same (~$25-35 each) and both have washable pre-filters. The HPA100 filter replacement is HRF-APP1-compatible; the HPA300 uses HRF-APP2-style filters. Check your model before buying.

Is the Honeywell HPA300 worth the extra money over the HPA100?

For a living room, yes — the HPA300 is the correct tool and the value per CFM is better. For a bedroom, no — the HPA100 is enough and you'd be paying for power you don't use. The honest rule: buy for the room, and let the room decide which one is 'worth it.'

Honeywell HPA100 vs HPA300: Which Should You Buy?

Two white boxes, same family, different jobs. The Honeywell HPA100 and HPA300 are frequently compared because they look identical — and frequently bought wrong, because people pick by price instead of by room.

Here’s the short version: they’re the same philosophy at different scales. Pick by room size, nothing else. Here’s the full breakdown.

🧰 Interactive Tools

📏Room Size CalculatorLet the room decide HPA100 vs 300→ 🔄Filter Cost CalculatorCompare 5-year costs→

Editor’s note (September 2026): The Winix 5500-2 has been discontinued and remaining stock is limited. Winix’s official successor is the Winix 5510, which adds app control and uses a new filter. Read our Winix 5510 vs 5500-2 comparison before you buy either one.

The Head-to-Head

HPA100 and HPA300 side by side

	Honeywell HPA100	Honeywell HPA300
Price	$129	$249
CADR (smoke)	120 CFM	300 CFM
Coverage (4.8 ACH)	~190 sq ft	~465 sq ft
Noise	28-55 dB	32-63 dB
Filtration	True HEPA + carbon	True HEPA + carbon
Pre-filter	Washable	Washable
Controls	3 speeds + timer	3 speeds + timer
Sensor	None	None
Filter cost	~$25-35 / 6-12 mo	~$25-35 / 6-12 mo
Footprint	Compact	Large

The Real Differences

1. Room Coverage (The Only Question That Matters)

The HPA100 cleans a bedroom. The HPA300 cleans a living room. That’s the whole decision:

150 sq ft bedroom → HPA100 (120 CFM covers it at 4 ACH, fine)
200 sq ft bedroom → either works; HPA100 at max, HPA300 on low (quieter)
300 sq ft living room → HPA300 required — the HPA100 can’t keep up
400+ sq ft open plan → HPA300

2. Noise Profile

Both are quiet on low (28-32 dB) and loud on max (55-63 dB). The HPA300 on low in a big room is quieter in practice than an HPA100 on high in the same room — another reason to size up if you’re between rooms.

3. The Value Math

Per CFM: HPA100 = $1.08/CFM, HPA300 = $0.83/CFM. The HPA300 is better value per unit of cleaning — the price gap is smaller than the power gap. If you’re torn and the room can fit it, the 300 is the smarter dollar.

4. Filters

Different sizes, same cost (~$25-35). The HPA300’s filter cleans more air per dollar because it’s catching more per pass. Both have washable pre-filters (reuse for years).

The Decision Rule

Your room	Buy
Under 200 sq ft (bedroom, office, nursery)	HPA100 ($129)
200-300 sq ft (big bedroom, small living)	HPA100 on max, or HPA300 on low if budget allows
Over 300 sq ft (living room, open plan)	HPA300 ($249)
Over 450 sq ft	HPA300 on max, or consider dual units

The Alternative at $199

One more consideration: the Winix 5500-2 ($199) sits between them at 232 CFM, with a washable carbon filter (better odor handling) and a sensor-based auto mode — both Honeywells lack sensors entirely. If you want the middle ground with modern features, it’s the better $199 than either Honeywell in many homes.

The Bottom Line

HPA100 for small rooms, HPA300 for big rooms — the room decides, not the price tag. The HPA300 is the better value per CFM and quieter in practice for medium rooms; the HPA100 is the right-sized tool for bedrooms. And before you buy either, check the Winix 5500-2 — for $199 it splits the difference with better features. Whichever you choose, size it with the calculator and you’ll be happy; size it wrong and no purifier will help.