Levoit Core 400S-P vs Core 600S: Which One Fits Your Room?

Buy the Levoit Core 400S-P for any room up to about 360 sq ft, and the Levoit Core 600S for spaces from there to roughly 600 sq ft, which covers most open kitchen-and-living layouts. The 600S moves about 70% more air (391 vs 231 CFM smoke CADR on current AHAM ratings) for roughly $100 more, and if its filter really lasts a year, it can cost about the same to own over three years.

The short answer

Choose the Core 400S-P if you are cleaning a bedroom, home office or modest living room under about 360 sq ft, the purifier will stand out in the room rather than against a wall, or you want to keep the purchase near $200.

Choose the Core 600S if the space is 360 to 600 sq ft, open to a kitchen or hallway, or has ceilings above 8 ft, or you want a mid-size room cleaned on a gentler fan setting.

Spec	Core 400S-P	Core 600S
Smoke CADR	231 CFM, AHAM Verifide	391 CFM current AHAM rating; older listings say 410
Room size at 4.8 air changes/hr	~358 sq ft	~606 sq ft
Levoit's noise rating	22 to 52 dB	26 to 55 dB
Rated maximum draw	38 W	49 W
Weight	11 lb	13.7 lb
Filter	Core 400S-RF, $49.99 list, every 6–8 months	Core 600S cylinder, about $55–65, yearly per our catalog
App, auto mode, air sensor	Yes	Yes
Usual price	$160–$220	$280–$320

Where does the 400S-P run out of room?

Both numbers in the table come from the same rule: smoke CADR times 1.55 gives the floor area a unit can clean at 4.8 air changes an hour under an 8 ft ceiling. Run that across some typical rooms, with each purifier on full speed:

Room (8 ft ceiling)	Core 400S-P	Core 600S
13 x 20 primary bedroom, 260 sq ft	6.7 changes/hr	11.3 changes/hr
15 x 24 living room, 360 sq ft	4.8, right at its limit	8.2
18 x 25 family room, 450 sq ft	3.9, undersized	6.5
20 x 30 great room, 600 sq ft	2.9, undersized	4.9
24 x 30 kitchen plus living area, 720 sq ft	2.4	4.1, undersized

So there is a clean break at about 360 sq ft. Under it, the smaller Core does the job; between 360 and 600, only the 600S does; past 600, neither one is enough on its own.

Ceiling height moves the line. With 9 ft ceilings the 400S-P's limit drops to about 318 sq ft and the 600S's to about 539. A 10 ft ceiling pulls them to roughly 286 and 485. That is why a vaulted living room that measures 330 sq ft on the floor plan often belongs with the 600S. The room size calculator handles the volume for you.

Levoit's own box claims, about 1,718 sq ft for the 400S-P and close to 2,900 for the 600S, assume one air change per hour. That is too slow to make a difference during pollen season or a smoke event, so leave those figures out of the decision.

Why some people put a 600S in a 300 sq ft room

Headroom buys quiet. To give a 300 sq ft room 4.8 air changes an hour, a purifier has to deliver about 192 CFM. That is 83% of the 400S-P's maximum, so it will spend a lot of time on its upper speeds, and HouseFresh measured the original Core 400S at 60.3 dBA on top speed. The same 192 CFM is under half of what the 600S can move.

The catch is that Levoit doesn't publish per-speed airflow or noise for the 600S, so it isn't possible to say exactly which setting delivers 192 CFM or how loud that setting is. What the numbers do show: HouseFresh found the 400S kept about 134 CFM while staying under 45 dBA, which works out to only 3.4 changes an hour in that 300 sq ft room. If you want a living room cleaned hard while the TV is on, the bigger unit has the better chance of doing it quietly.

If the room is a bedroom under 260 sq ft, this argument fades. The 400S-P already reaches nearly 7 changes an hour flat out there, and its lower 22 dB floor suits sleeping.

Three-year cost, side by side

Assumptions: the middle of each unit's usual price range; the first filter ships in the box; the 400S-P's cylinder is replaced on Levoit's 6–8 month guidance (about every 7 months, so five replacements in 36 months); the 600S's filter is replaced yearly at about $60, as the site's catalog lists it. Electricity is at $0.17/kWh, running around the clock.

Over 36 months	Core 400S-P	Core 600S
Purchase	~$190	~$300
Replacement filters	5 x $49.99 = ~$250	2 x ~$60 = ~$120
Subtotal	~$440	~$420
Power	~$38 on speed 2 (8.51 W, HouseFresh)	Only the 49 W maximum is published: ~$73 a year as a worst case

On those terms the two land within about $20 of each other before electricity, and the 600S covers 70% more floor. Two things can change that. If you stretch the 400S-P's filter to a year in a light-use bedroom, its subtotal falls to about $290 and the gap swings back $130 in its favor. And if the 600S cylinder ends up needing the same 7-month rhythm as the smaller one, five replacements at about $60 push its filter bill to roughly $300, so check the interval printed on the 600S filter box before banking on a year. The Levoit Core 600S Replacement Filter page has current fit and pricing, and the filter cost calculator lets you plug in your own swap interval.

Details that catch upgraders out

Filters stay with their machine. The Levoit Core 400S Replacement Filter fits the Core 400S, Core 400S-P, PlasmaPro 400S and PlasmaPro 400S-P. None of them fit the 600S, and the 600S cylinder doesn't fit them. Moving up means a new filter supply.

The 600S has two published CADRs. Many reviews, including older pages on this site, quote 410 CFM. The current Core 600S-P listing is AHAM-rated at 391 CFM for smoke, and the roughly 606 sq ft coverage figure is based on that lower number.

The "-P" suffix is a listing change, not a redesign. The Core 400S-P has the same 38 W rating, 10.8 in round body and filter as the original Core 400S. Old paperwork printed 260 CFM and 403 sq ft; the AHAM-verified smoke figure is 231.

Weight barely differs. At 11 lb and 13.7 lb, both can be carried from room to room, so portability shouldn't decide this one.

Two 400S-Ps or one 600S?

Two Core 400S-P units deliver 462 CFM between them, about 18% more than one 600S, and in separate rooms each one gets its own sensor and schedule. For a living room plus a primary bedroom, that split can beat a single big unit parked in the hallway.

For one open space, the math turns against it. The pair costs about $380 up front against about $300, and on Levoit's schedule the filters alone come to ten cylinders, roughly $500, over three years. Unless the layout is L-shaped with two separate dead zones, buy the single 600S.

Which one to buy

Measure the floor and look up at the ceiling. Below about 360 sq ft at 8 ft, the Core 400S-P is the right size and the cheaper machine to buy. From 360 to 600 sq ft, or in a smaller room with a high ceiling, the Core 600S is the only one of the two that keeps up.

If pets drive the purchase and the room is under about 390 sq ft, look at the Levoit Vital 200S-P instead: 250 CFM, a pre-filter that rinses clean, and a lower price than either Core. For an open floor much larger than 600 sq ft, a second purifier is usually cheaper than chasing one giant unit, though the large-room picks list single machines for those spaces.