The Honeywell HPA300 is a simple air purifier intended for use in larger rooms. It might not offer the latest smart features, like built-in particle sensors, automatic fan speed adjustment, or Wi-Fi connectivity. However, it boasts a robust two-stage filtration system with three separate HEPA filters and a powerful 130-watt motor.
Our Verdict
The Honeywell HPA300 is great for pet owners. It delivers superb particle filtration performance, which is sufficient to trap smaller particles like pet dander. Its clean air delivery rate is also high enough to make it suitable for large spaces. That said, while it has an operating timer you can set to power off after 2, 4, or 8 hours, its lack of Wi-Fi connectivity means it isn't the best option if you like to fine-tune settings and are frequently away from home. It's also quite loud, so easily startled pets might not appreciate having this air purifier run nearby.
Excellent clean air delivery rate.
- Noisy even at lower power settings.
The Honeywell HPA300 is a mediocre option for use in bedrooms. Even at its lowest power setting, it runs quite loudly, which isn't great if you want to leave it running overnight. On the upside, you can completely turn off its LED indicators, so you won't have to contend with any small lights out of the corner of your eye when trying to get some rest. It offers great overall air purification performance, too.
- Auto-off timer.
Excellent clean air delivery rate.
- No particle sensor or automatic fan speed adjustment feature.
- Noisy even at lower power settings.
The Honeywell HPA300 has an excellent particle filtration rate. It offers a sufficiently high CADR to operate efficiently as a single unit within an average-sized studio apartment, and won't have any trouble in larger living rooms or dining rooms in bigger houses either.
Excellent clean air delivery rate.
- Noisy even at lower power settings.
Changelog
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Updated Feb 11, 2026:
We've updated the text in this review to reflect new tests added with version 1.1 of our test bench.
- Updated Feb 11, 2026: Version 1.1 of our air purifier testing methodology provides a more representative summary of unit performance, with a revised Particle Filtration Rate test conducted in a better-sealed environment and a more reliable means of generating consistently sized particulate matter. We've also included a parameter for the machine's maximum recommended room size. For a more detailed breakdown of the changes made, see our full changelog.
- Updated Nov 04, 2025: Version 1.0.2 of our Air Purifier Test Bench rectifies calculation errors in our existing Particle Filtration Rate test to provide more representative results of some units. For a more detailed breakdown of the changes made, see our full changelog.
- Updated Oct 31, 2024: Converted to Test Bench 1.0.1.
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Differences Between Sizes And Variants
The Honeywell HPA300 is available in two color variants: 'Black' and 'White.' We tested the 'Black' model; see its label.
If you encounter another variant of this device, let us know in the comments, and we'll update our review.
Popular Air Purifier Comparisons
The Honeywell HPA300 is an air purifier intended for larger spaces. In broad terms, it's an unsophisticated but highly effective machine, almost a store-bought version of a Corsi-Rosenthal Box: it uses more power and makes more noise than most other comparably-sized options, lacks many of the smart features like Wi-Fi or particle sensors found on alternatives, and has three separate HEPA filters that need replacing every year, leading to high ownership costs. All that said, it does a great job of trapping particles of various sizes and has a very high clean-air delivery rate.
Test Results
The user interface is pretty minimalist, though it conveys most of the relevant information about the air purifier's status. Indicator lights will illuminate when you need to check the pre-filter and HEPA filters. There's also a timer you can enable to have it run for two, four, or eight hours before turning off, a fan speed slider along with a separate 'Turbo' mode button, and a button to adjust the LED brightness through three levels:
- High
- Low
- Off
This air purifier has a two-stage filtration system comprised of a carbon pre-filter and three separate HEPA filters. The carbon filter is a sheet design, which has a smaller effective surface area than a comparably sized pellet-type unit and contains an insufficient amount of carbon to effectively deal with volatile organic compounds (VOCs). You should replace this carbon filter every three months; you can purchase a replacement here. A higher-performance 'A+' carbon filter is available, too, but it still contains a low amount of activated carbon. If you'd like to buy that filter, you can find it here. Meanwhile, the HEPA filters have a lifespan of 12 months. You can buy a single unit here or a three-pack of HEPA filters here.
The Honeywell HPA300's max particle filtration rate is amazing. As long as it's set to its highest fan speed, it's a highly effective unit for use in larger living areas.
The Honeywell HPA300's noise output varies heavily depending on fan speed. At its lowest setting, it can be used in a bedroom or living space without drowning out nearby conversation or becoming a massive headache, though it is still louder than some alternatives. At its highest fan speed, however, it can make nearby conversation somewhat difficult.