IQAir Atem X review

The IQAir Atem X is an excellent particle purifier for a large room. It is also a $1,399 machine whose main rivals cost a fraction as much. On paper it does what IQAir says: 471 CFM at the top speed, a published CADR at every speed, and an independent test that lands close to those numbers. Buy it if you want one quiet, slim unit for a living space of 500 to 730 sq ft and you're paying for design and refinement as much as clean air. Skip it if your problem is chemical odors, or if you're trying to get the most clean air per dollar.

How much room does it really cover?

IQAir does something here that it doesn't do for the HealthPro Plus: it publishes a CADR for each of the Atem X's eight fan speeds. That makes sizing straightforward. At the 4.8 air changes per hour we use for allergies and smoke, with 8 ft ceilings:

IQAir's headline figure is 1,650 sq ft cleaned in 30 minutes on top speed, which works out to about two air changes an hour. That's a reasonable claim stated honestly, but it isn't the figure to size against if anyone in the house has allergies.

The independent check comes from HouseFresh, which ran the Atem X in its 728 cubic ft test room and estimated a PM1 CADR of about 429 CFM, enough for five air changes an hour in about 643 sq ft. That's within 10% of IQAir's top figure, which is better agreement than many brands get. For a quick sanity check against your own floor plan, the room size calculator does the same math.

What HyperHEPA actually claims

IQAir rates its HyperHEPA media at 99.5% capture down to 0.003 microns. Standard HEPA is defined at 0.3 microns, and our HEPA explainer covers why that particular size is used. HyperHEPA is IQAir's own rating, not an industry grade like H13, so you're taking IQAir's word for the 0.003-micron figure.

The more useful point is that filter efficiency describes what happens to air that passes through the filter, while CADR describes how much air passes through in a minute. A purifier with exceptional media and weak airflow still cleans a room slowly. The Atem X avoids that trap: HouseFresh's measured result tracks IQAir's airflow figures, so whatever the media is doing at ultrafine sizes, it isn't costing airflow. For ordinary dust, pollen and smoke particles, the 471 CFM matters more than the 0.003-micron claim.

How it compares with the HealthPro Plus

These two cover similar-size rooms but solve different problems.

The IQAir HealthPro Plus ($1,199.99) is a tall cabinet built around a V5-Cell gas-and-odor cartridge packed with activated carbon and alumina. IQAir doesn't publish a CADR for it, and its top speed of 300 cfm draws 134 W. The current XE version has a PM2.5 sensor, a Smart Mode and app control, so the smart-feature gap between the two IQAirs has closed.

The Atem X is roughly 10 inches deep and 27 inches tall and weighs 28.7 lb. It runs at 6 W on speed 1 and 86 W on max, uses sensor-driven smart modes, and connects to IQAir's app. Its standard US filter set is three HyperHEPA particle filters with no comparable carbon bed.

The deciding question is what you're cleaning. For pollen, dander, dust and wildfire smoke particles, the Atem X is the better buy: published numbers, more airflow per watt and a quieter low end. For new-furniture off-gassing, cooking and smoke odors or chemical sensitivity, the HealthPro Plus is the IQAir to own, because no particle filter removes gases.

Electricity widens the gap for heavy users. Run around the clock on max at $0.17/kWh, the Atem X uses about 753 kWh a year ($128) for 471 CFM, and the HealthPro Plus XE about 1,174 kWh ($200) for 300 cfm of airflow.

Filters and 3-year cost

IQAir sells the Atem X HyperHEPA Filter Set (three filters) for $199.99. The unit tracks filter life itself. IQAir cites up to 36 months for the filters, while its store copy describes a set lasting a year under recommended use, so plan on that range: about $200 a year if the purifier works hard in a big room, and closer to $200 every three years in a cleaner, lightly used space.

Three-year cost at $0.17/kWh:

• Purchase: ~$1,399
• Filters: $200 (one set) to $600 (one a year)
• Electricity: about $27 (speed 1 all the time) to $384 (max all the time); IQAir doesn't publish wattage for the middle speeds, so a realistic Auto-mode figure falls between those
• Total: roughly $1,630 to $2,380

For comparison, the AirDoctor AD5500i lists about 556 CFM for $999 with filters around $355 a year, and two Levoit Core 600S units (391 CFM each, about $300 each, filters ~$60 a year apiece) put 782 CFM into two rooms, and their purchase price plus three years of filters (about $960) comes in under the Atem X's purchase price alone. The filter cost calculator lays out the same comparison with your own prices.

Noise and bedroom use

IQAir's spec sheet puts sound pressure at 15 dB(A) on speed 1 and 58 dB(A) on speed 8, measured at about 3.3 ft. HouseFresh measured 35.6 to 62.3 dBA in its test room. Some of that gap at the low end probably reflects the test room's background noise and a different measuring method, but it's a reminder that speed 1 will be very quiet in practice, not a 15 dB reading on a meter in your bedroom.

For sleeping, the useful number is speed 3 or 4: 162 to 206 CFM, enough for a 250 to 320 sq ft bedroom, and IQAir lists sound power of 38 and 44 dB(A) on those speeds against 65 dB(A) on speed 8. A machine this size in a 12x14 bedroom is overkill, though; a $200 purifier will do that job.

The catches

• Price is the whole debate. Nothing on the spec sheet justifies $1,399 on airflow alone. You're paying for IQAir's build, the flat design, per-speed transparency and low power at high output.
• It's a particle machine. The standard filter set has no meaningful gas stage.
• Size and weight. At 25 inches wide and 28.7 lb, it's slim but not small; it needs a clear stretch of wall.
• Warranty terms weren't confirmed in our research; check IQAir's terms before buying, and keep the box until you do.

Is it the right one for you?

Buy the IQAir Atem X if you have a large living room or open space, your concern is particles, and you'd rather own one quiet, well-made unit than two or three ordinary ones. Buy the IQAir HealthPro Plus instead if odors, VOCs or chemical sensitivity are part of the picture. If you want the most clean air for the money, the AirDoctor AD5500i offers more CADR for about $400 less up front, and a pair of Levoit Core 600S units covers two rooms for less than half the purchase price. Our list of the best air purifiers over $1,000 puts it in context with the other premium options.