SereneLife SLACSW538
A large room cooler with a big tank, app control and a remote for dry climates. Judge it by the maker’s 1059 CFM, not the Amazon headline.
Amazon $199.90$199.90
The SereneLife SLACSW538 and the Hessaire MC18 are evenly matched, rated 3.2 and 3.2. The SereneLife SLACSW538 leads on tank and features. The Hessaire MC18 wins on airflow and value. The Hessaire MC18 costs $12.90 less ($187 vs $199.90).
Hessaire MC18
A cheap, light cooler for one person in a dry garage, porch or small room. Buy it for the low running cost, not for wide coverage.
Amazon $187$187
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the SereneLife SLACSW538 for tank (7.9 gal tank vs 4.8 gal tank) and features (rigid cooling pads, oscillation, remote vs rigid cooling pads, hose hookup).
- Choose the Hessaire MC18 for airflow (1,300 CFM vs 1,059 CFM) and value ($143.85 per 1,000 CFM ($187, 1,300 CFM) vs $188.76 per 1,000 CFM ($199.90, 1,059 CFM)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every under 2,000 CFM evaporative cooler; a clear win is highlighted. How we rank explains each one.
| Factor weight | SereneLife SLACSW538 | Hessaire MC18 |
|---|---|---|
| Overall rating | 3.2/5 | 3.2/5 |
| Value 30% | 59 $188.76 per 1,000 CFM ($199.90, 1,059 CFM) | 69 $143.85 per 1,000 CFM ($187, 1,300 CFM) |
| Airflow 25% | 51 1,059 CFM | 67 1,300 CFM |
| Tank 10% | 74 7.9 gal tank | 35 4.8 gal tank |
| Features 15% | 75 rigid cooling pads, oscillation, remote | 50 rigid cooling pads, hose hookup |
| Warranty 20% | 0 1-year warranty | 0 1-year warranty |
Specifications
| SereneLife SLACSW538 | Hessaire MC18 | |
|---|---|---|
| Cooling | ||
| Airflow | 1,059 CFM | 1,300 CFM |
| Cooling area | 538 sq ft | 500 sq ft |
| Cooling pads | Rigid cellulose | Rigid cellulose |
| Tank | 7.9 gal | 4.8 gal |
| Hose hookup | No | Yes |
| Controls and build | ||
| Fan speeds | 3 | 2 |
| Oscillation | Yes | No |
| Remote | Yes | No |
| Power draw | 140 W | 85 W |
| Weight | 20.7 lb | 16 lb |
| Warranty | 1 year | 1 year |
| Released | 2026-01-28 | - |