Model differences
Airmega 100 or Airmega 150? Compare the rate and routine
Both Coway models offer local controls, particle-responsive Auto and colored air-quality feedback. Their useful differences are room-rating basis, body shape and what happens when the filters need attention.
Make the room numbers comparable
The Airmega 100 product specification table lists 810 square feet at one air change per hour and 405 square feet at two. Coway also shows 167 square feet in 12.5 minutes in a graphic on the exact product page. One air change every 12.5 minutes corresponds to 4.8 air changes an hour, so that graphic supplies a 167-square-foot 4.8-equivalent comparison even though the specification table does not name that rate. The Airmega 150 page states 214 square feet at 4.8 ACH, 518 at two ACH, and 1,035 at one. At the same higher-rate basis, the 150 covers a larger published area. These are manufacturer figures, not an independent test; open doorways, room height and fan setting still matter.
The distinction changes the answer to an ordinary room question. A 140-square-foot compact room meets both products' 4.8-rate figures. A 219-square-foot requirement meets neither: the 150's published 214 square feet is still below the threshold and the 100's derived area is 167. Neither product should be recommended for that threshold on the strength of its one-change headline. If a lower two-change rate is suitable to your use, the 100's 405-square-foot figure and 150's 518-square-foot figure create another comparison—but only compare products that publish the same rate.
Think about placement, not only the shell
The 100 is a 360-degree cylindrical intake body, 8.7 inches wide and deep and 15.6 inches high. It weighs 6.6 pounds. The 150 is a shallow, front-intake unit measuring 13.4 by 6.5 by 18.5 inches and weighing 12.1 pounds. The 100's smaller footprint is helpful on a bedroom floor, while the 150's shallow front profile may suit a narrow wall-side spot. Neither can be pushed flush into a corner: the 100 still needs open intake and outlet paths; Coway's AP-1019C manual specifies 20 cm around the 150's sides and 2 m from televisions and electronics. Check the precise manual before fixing furniture around either body.
Choose the maintenance style you will keep up
Airmega 100 uses one combined cartridge with a vacuumable pre-filter, HEPA and deodorization stages. Coway lists a one-year life; the manual says to brush or vacuum visible dust and clean the particle sensor every two months. The Airmega 150 has three separate stages: a washable pre-filter, deodorization filter and HEPA filter. Its manual recommends cleaning the pre-filter every two to four weeks, replacing the deodorization stage at six months and the HEPA stage annually, using a stated eight-hours-per-day/speed-two basis. That offers independent stage changes, but it also means more frequent scheduled attention. The 100's cartridge is simpler to swap, but its pre-filter is not a washable part.
Controls are similar, not identical to a monitor
Both families provide an Auto setting driven by a particle sensor and a color air-quality indicator. The 100's manual lists three fan levels, Sleep, a one-to-eight-hour timer and an AQI/night-light/off cycle. The 150's manual also gives Auto and three speeds, plus sensor-sensitivity adjustment; it has no documented numeric PM2.5 display. Do not mistake colored lights for a measured concentration, and do not treat particle sensing as a gas sensor. The Airmega 100 page/manual combination documents local panel operation, not app scheduling.
Favor the Airmega 100 when its 167-square-foot 4.8-equivalent area is enough and the cylinder's compact size and single replacement cartridge suit your setup. Favor the Airmega 150 when you need its larger 214-square-foot 4.8-ACH figure or prefer its split filter stages. For a stricter room size, prioritize the published faster-rate area over the largest number on either page.
Primary references: Airmega 100 product page, its model-specific manual, and the Airmega 150 product page.