# Coway Airmega 400S: specs and price

**Price (US):** $749 (List price $749.00 on cowaymega.com (Coway's official US store), shown as regular price $749.00, as of 2026-07-07. Amazon listing (B01C9RIAFS) sells the same model but shows a fluctuating third-party/import price, so the manufacturer list price is used.), as of 2026-07-07. Among the 21 air purifiers we track it is #16 cheapest of 21; category median $299.99.
**Brand:** Coway
**Deskmark:** Silver Deskmark — pay-blind category standing 48/100, #8 of 19 in class (independent, computed from sourced data, never for sale).

## Specifications

| Spec | Value |
| --- | --- |
| Price (US) | $749 |
| Brand | Coway |
| Cadr smoke (CFM) | 328 |
| Coverage (sq ft) | 1560 |
| Hepa | Yes |
| Filter type | Washable Pre-Filter + Max2 Filter (Activated Carbon + HEPA) |
| Noise db min | 22 |
| Smart | Yes |
| Energy star | — |

## Where it stands

At $749, the Coway Airmega 400S is #16 cheapest of the 21 air purifiers we track, where the median is $299.99. On the spec sheet, its coverage of 1560 sq ft is the highest of the 22, its cadr smoke of 328 CFM is above the median of the 15, and its noise db min of 22 is below the median of the 19.

## What reviewers say

Only one whitelisted tester — Digital Trends — published a hands-on review of this exact Coway Airmega 400S. Its writer praised the smart air-quality sensing and large coverage but flagged the high price, bulky footprint and flaky Wi-Fi reconnection. (Based on 1 review, 1 lab-tested, 2022-04-21.)

Praised: Smart sensor detected unnoticed cooking smoke and alerted the phone app; Cleared air from very unhealthy to good in about half an hour; Large coverage (up to 1,560 sq ft), more than many competitors.
Flagged: Expensive at $849, a $100 premium over the non-smart 400; Bulky (~25 lbs) and sits idle taking up space most of the day; Trouble reconnecting to Wi-Fi after being unplugged; Did not noticeably relieve allergies during weeks of use.
Disagreement: Single-source: only Digital Trends reviewed this exact model, so cross-source agreement cannot be assessed.
Sources: Digital Trends (2022-04-21, digitaltrends.com)

## Frequently asked questions

**What do reviewers say about the Coway Airmega 400S?**

Only one whitelisted tester — Digital Trends — published a hands-on review of this exact Coway Airmega 400S. Its writer praised the smart air-quality sensing and large coverage but flagged the high price, bulky footprint and flaky Wi-Fi reconnection. Praised: Smart sensor detected unnoticed cooking smoke and alerted the phone app; Cleared air from very unhealthy to good in about half an hour; Large coverage (up to 1,560 sq ft), more than many competitors. Flagged: Expensive at $849, a $100 premium over the non-smart 400; Bulky (~25 lbs) and sits idle taking up space most of the day; Trouble reconnecting to Wi-Fi after being unplugged; Did not noticeably relieve allergies during weeks of use. (From 1 tester review, 1 lab-tested.)

**How much does the Coway Airmega 400S cost?**

The Coway Airmega 400S has a US price of $749 (List price $749.00 on cowaymega.com (Coway's official US store), shown as regular price $749.00, as of 2026-07-07. Amazon listing (B01C9RIAFS) sells the same model but shows a fluctuating third-party/import price, so the manufacturer list price is used.), as of 2026-07-07.

**How does the Coway Airmega 400S compare on price?**

At $749, the Coway Airmega 400S is #16 cheapest of the 21 air purifiers we track, where the median is $299.99.

**What are the Coway Airmega 400S's key specs?**

Coway Airmega 400S (Coway): cadr smoke cfm 328, coverage sqft 1560, hepa Yes, filter type Washable Pre-Filter + Max2 Filter (Activated Carbon + HEPA), noise db min 22. Full sourced spec sheet verified 2026-07-07.

Source: https://cowaymega.com/products/airmega-400s (cowaymega.com, accessed 2026-07-07)
Corroboration: https://www.amazon.com/Coway-Airmega-400S-App-Enabled-Technology/dp/B01C9RIAFS (accessed 2026-07-07)
Canonical: https://frontdeskreview.com/product/air-purifiers/coway-airmega-400s/
Cite: Per The Front Desk Review, the Coway Airmega 400S price of record was $749 as of 2026-07-07 — https://frontdeskreview.com/product/air-purifiers/coway-airmega-400s/
License: CC BY 4.0. Price history: https://frontdeskreview.com/data/price-history.jsonl