Dyson HP2 De-NOx Review: Purify, Heat, and Cool

Upgrade your space with the Dyson Purifier Hot+Cool HP2 De-NOx, a sleek all-in-one device that heats, cools, and purifies. It’s designed to support better indoor air quality while keeping you comfortable in every season.

---

What it is and who it’s for

A tower-style purifier and heater with a fully sealed, 3-stage filtration system: HEPA H13 for particles, a K-Carbon layer for gases (including NO₂), and a catalyst designed to continuously break down formaldehyde. It connects to the MyDyson app and works with compatible voice assistants. It has a compact footprint (about 10 inches across and roughly 30 inches tall) and typically weighs around 12 pounds.

Best for

• Apartment bedrooms, nurseries, and home offices where you want heat, cooling airflow, and filtration from one device
• Homes near busy roads or with gas cooking that want extra help addressing NO₂
• Buyers who care about design, quieter directed airflow, and a simple app experience

Might skip

• Large living rooms where you need very high particle cleaning performance from a dedicated air purifier
• Shoppers who don’t need heat and want the lowest cost per amount of cleaned air

Performance and results

Air purification

• The HP2 De-NOx uses a sealed HEPA H13 system designed to capture 99.97% of particles down to 0.3 microns, plus a K-Carbon layer for gases and odors. Dyson positions the De-NOx variant as improving NO₂ capture versus earlier comparable Dyson filter setups. Sensors feed an LCD and the MyDyson app so you can track particulate levels and gases (including NO₂) over time.

Heating and cooling

• Dyson’s Air Multiplier airflow projects a smooth stream of air that can help warm a room evenly in heater mode and deliver strong cooling airflow in warmer months. You can adjust temperature targets, schedules, and oscillation in the app or with the included remote.

Noise

• On mid settings, it’s generally more pleasant than a typical box fan, and Night mode dims the display while running more gently. Like most compact purifiers, noise increases noticeably at higher speeds.

Real-world room size

• Dyson doesn’t emphasize a single CADR number the way many dedicated purifiers do, and “whole-room” claims can be hard to compare across brands. In practice, many listings and user use-cases align this model with bedroom-size spaces. For a large living area, you may get better results by adding a high-CADR dedicated purifier or choosing a larger, purifier-first model.

A note on expectations

• Independent testing of older Dyson Hot+Cool models has often shown lower particle-cleaning performance for the price compared with dedicated air purifiers. The De-NOx filter is a meaningful upgrade for gas-phase concerns, but if your top priority is maximum particle cleaning per dollar, a dedicated purifier is usually the better buy.

Ease of use and maintenance

• Setup: Plug it in, connect to the MyDyson app, assign it to a room, and turn on Auto mode if you want it to adjust on its own.
• Controls: You can use onboard controls, the magnetic remote, the app, and compatible voice control. Scheduling and air-quality graphs are easy to navigate.
• Filter care: The combined 360° HEPA + K-Carbon cartridge is simple to replace, and the machine/app will alert you when it’s time.
• Cleaning: Wipe down the shroud and base as needed—no exposed blades to dust.
• Footprint: The slim design fits nicely near a wall or desk, but leave space around it for proper airflow.

Key features that matter

• Fully sealed HEPA H13 filtration to 0.3 microns
• K-Carbon gas filtration designed to help address NO₂ and common household gases
• Formaldehyde catalyst designed to work continuously
• Heating, cooling airflow, and purification in one device
• MyDyson app for real-time air quality, schedules, and control
• LCD status display and magnetic remote storage on top

Comparisons

Model	What it is	When it wins	Keep in mind
Dyson HP2 De-NOx	Purifier + heater + cooling airflow with NO₂-targeting K-Carbon	One device for small rooms, stronger focus on NO₂, premium user experience	Premium price, not the strongest option for particle CADR
Dyson HP1	Newer Hot+Cool line without the De-NOx emphasis	Lower entry price for a 3-in-1 Dyson	Less NO₂-specific filtering focus compared with De-NOx
Dyson HP07/HP09 Formaldehyde	Earlier Hot+Cool models with formaldehyde features	Wider availability with similar comfort features	Doesn’t carry the De-NOx positioning for NO₂ capture
Dedicated purifier + basic space heater	Two devices	Best particle cleaning performance for large rooms at a lower cost	More space, two power cords, and less of a “one-and-done” setup

Affiliate disclosure: If you buy through our links, we may earn a small commission at no extra cost to you.

Value and verdict

If you want to replace multiple devices in a small-to-medium bedroom or office, the HP2 De-NOx is a refined, easy-to-live-with option with a stronger focus on gas-phase pollutants like NO₂. If you’re trying to clean the air in a big open space—or you want the most particle-cleaning performance per dollar—a high-CADR dedicated air purifier (plus a separate heater if needed) is usually the better value.

Who should buy

• Households that want heating, cooling airflow, and filtration in one tidy unit
• City homes or gas-cooking households that care about NO₂ and odors
• Anyone who values Dyson’s app, design, and quick filter changes

Who should skip

• Large rooms where you need maximum particle cleaning performance
• Buyers who don’t need heating and want a lower cost per amount of cleaned air

Ratings (/5)

• Gas and odor control: 4.8
• Particle filtration for small rooms: 4.3
• Heating performance: 4.5
• Cooling airflow and comfort: 4.4
• App and usability: 4.7
• Value for money: 3.9
  Overall: 4.4/5

Pros and cons

Pros

• Stronger focus on NO₂ reduction than many earlier Dyson heater-purifiers
• Sealed HEPA H13 filtration plus a formaldehyde-reducing catalyst
• Combines heating, cooling airflow, and purification in a slim, attractive design

Cons

• Costs more than dedicated purifiers with higher particle-cleaning performance
• Best suited to bedroom-size spaces rather than large open rooms
• Replacement filters add ongoing cost

What to know before buying

• Place it where air can circulate freely, and keep it away from curtains, bedding, or anything that could block the intake.
• Auto mode works well day to day, but cooking or smoke events may call for manually increasing the fan speed for faster cleanup.
• If wildfire smoke or heavy dust is a recurring issue in a larger space, consider pairing this with a high-CADR purifier during those periods.

Frequently Asked Questions ▾

What’s the difference between the HP2 De-NOx and older Hot+Cool models?

The De-NOx version adds a potassium-enriched K-Carbon filter designed to better address NO₂ compared with earlier filter setups, while keeping the sealed HEPA filtration and app-based controls.

Does it heat a room effectively?

For smaller rooms, yes. It’s best suited to bedrooms and home offices where it can help warm the space evenly without needing a separate heater.

What room size is the HP2 best for?

Think bedroom-size coverage. While Dyson markets “whole-room” purification, this style of 3-in-1 unit is typically a better fit for small to medium rooms rather than large open living areas.

What filters does it use, and how hard are they to replace?

It uses a single 360° combined HEPA + K-Carbon cartridge. Replacement is tool-free, and the LCD/app will tell you when the filter is due.

Does it actually remove formaldehyde?

Dyson states the machine uses a catalytic layer designed to continuously break down formaldehyde rather than only trapping it in a filter.