Some links on our site may earn us a commission at no extra cost to you. Learn more.
Published August 2, 2026. Updated October 10, 2026.
The real cost of owning one of these three air purifiers isn’t the sticker price. It’s what you keep buying afterward. The Levoit Core 400S (~$220) has the cheapest annual filter bill of the three (~$50/year). Even so, its filters alone cost more than the machine itself within about four and a half years. The Coway Airmega 400S (~$749) has the most expensive annual filter bill (~$129/year) but also the longest warranty. The Blueair Blue Pure 311i Max (~$230) needs filters most often, every 9 months instead of 12. That pushes its yearly filter cost above the Levoit’s despite a lower per-filter price.
I’ve spent years around room air purifiers, and the filter bill is the part nobody warns you about. The fan noise fades into the background. The reminder light and the invoice do not.
How much does an air purifier cost to buy?
Sticker price spans a wide range across these three, from $220 to $749. That gap is mostly explained by rated coverage, not brand markup. Here’s what each one costs to buy and how long the manufacturer stands behind it.
| Purifier | Price | Rated coverage | Warranty |
|---|---|---|---|
| Levoit Core 400S | $220, per Levoit’s own store | 1,718 sq ft at one air change per hour, per Levoit | 2 years, per Levoit’s own warranty policy |
| Coway Airmega 400S | $749, per Coway’s official store | 3,120 sq ft in 60 minutes, per Coway | 5 years on motor and electronics, 1 year on other parts, per Coway’s warranty page |
| Blueair Blue Pure 311i Max | $230, per Blueair’s own store | 2,107 sq ft in one hour, per Blueair | 1 year standard, extendable to 3 years by registering, per Blueair’s site |
Prices are approximate, current as of publication, and change frequently — confirm the latest price with the retailer before buying.
How much do air purifier filters cost each year?
This is the number that separates these three over time. The purchase price is a one-time cost, and the filter isn’t. Each brand publishes its own filter price and recommended replacement interval. Here’s what that works out to per year.
| Purifier | Filter price | Replacement interval | Filters per year | Annual filter cost |
|---|---|---|---|---|
| Levoit Core 400S | $49.99, per Levoit’s own store | ~12 months, per Levoit’s current US manual | 1.0 | ~$50 |
| Coway Airmega 400S | $129.00 for the Max2 filter set, per Coway’s own store | up to 12 months for the set, per Coway’s product page | 1.0 set | ~$129 |
| Blueair Blue Pure 311i Max | $44.99, per Blueair’s own store | up to 9 months, per Blueair’s own filter-life guidance | ~1.33 | ~$60 |
The Levoit has the cheapest annual filter bill of the three. The Coway’s filter set costs about two and a half times the Levoit’s per year ($129.00 against $49.99). That’s the tradeoff for a machine rated to cover 3,120 sq ft an hour instead of 1,718. The Blueair’s per-filter price actually sits below the Levoit’s. But Blueair rates the filter for as little as 9 months of use instead of 12. Replacing it more often erases that advantage and pushes its annual cost above the Levoit’s.
What does an air purifier cost over five years?
Stretch the filter math out over five years, a realistic ownership span for any of these three, and the picture shifts again. Here’s purchase price plus five years of filters, added up.
| Purifier | Purchase price | 5-year filter cost | 5-year total | Per-year average |
|---|---|---|---|---|
| Levoit Core 400S | $220 | ~$250 (5 × $49.99) | ~$470 | ~$94/year |
| Blueair Blue Pure 311i Max | $230 | ~$300 (5 × ~$60) | ~$530 | ~$106/year |
| Coway Airmega 400S | $749 | ~$645 (5 × $129.00) | ~$1,394 | ~$279/year |
The Levoit stays the cheapest of the three even after five years of filters. Its filter spend alone (~$250) still exceeds the machine’s own $220 purchase price within that window, which isn’t obvious from the sticker price. The Coway’s per-year average runs roughly triple the Levoit’s. But if 3,120 sq ft of actual coverage is what you need, none of the cheaper options gets you there. You’d need multiple smaller units instead, which multiplies the filter cost. The Blueair lands in the middle on both counts, with the most frequent filter swaps of the three.
How much does each air purifier cost per square foot?
Rated coverage changes the picture. We divided each machine’s price, and its five-year total, by the manufacturer’s rated coverage. The results use only the prices and ratings above.
| Purifier | Price per rated sq ft | 5-year total per rated sq ft |
|---|---|---|
| Levoit Core 400S | ~$0.13 ($220 / 1,718) | ~$0.27 ($470 / 1,718) |
| Coway Airmega 400S | ~$0.24 ($749 / 3,120) | ~$0.45 ($1,394 / 3,120) |
| Blueair Blue Pure 311i Max | ~$0.11 ($230 / 2,107) | ~$0.25 ($530 / 2,107) |
On that measure the Blueair is the cheapest per rated square foot, and the Coway is the most expensive. Treat it as a rough guide. Rated coverage is each manufacturer’s own published figure. It doesn’t tell you how well a machine cleans a given room.
Which air purifier is worth the filter bill?
For a single bedroom or small living room, the Levoit Core 400S wins on both purchase price and five-year total. Just budget for filters costing more than the machine did. For a large, open floor plan where 3,120 sq ft of coverage is a real requirement, the Coway’s higher filter bill is the cost of not needing several smaller units. The Blueair suits households that want mid-size coverage and are willing to swap filters a bit more often to get it.
Questions about air purifier filter costs
How much should I budget per year just for filters?
Budget roughly $50 a year for the Levoit Core 400S, $129 for the Coway Airmega 400S, and $60 for the Blueair Blue Pure 311i Max. Those figures come from each manufacturer’s own filter price and replacement interval.
Does a cheaper purifier always mean cheaper filters?
No. The Levoit costs the least upfront, but its yearly filters add up to more than the machine’s own purchase price within about four and a half years. So sticker price alone doesn’t predict total cost.
Can I stretch a filter past its rated replacement interval?
You can, but performance drops as a filter loads with particles. Running a HEPA or electrostatic filter well past its rated life reduces how much it captures, per each brand’s own replacement guidance.
Which air purifier has the cheapest long-term ownership cost?
The Levoit Core 400S has the lowest five-year total at roughly $470 including filters. It’s also rated for the smallest space at 1,718 sq ft an hour. So the comparison only holds if that coverage is enough for your room.
Do washable pre-filters cut down on the cost?
Partly. The Blueair’s cloth pre-filter is washable and reusable rather than a recurring purchase. The main particle-and-carbon filter behind it still needs periodic replacement, however well the pre-filter is maintained.
Filter-cost figures come from each manufacturer’s own current filter pricing and published replacement guidance. That means Levoit’s official store and US manual, Coway’s own store listing for its Max2 filter set, and Blueair’s own filter-life guidance and store pricing. Purchase prices, coverage ratings, and warranty terms come from each brand’s own store or a current major-retailer listing. Read our full editorial standards.
