What this tool answers
You need a first-pass portable evaporative (swamp) cooler class for a US garage, patio, shop, or open room. The calculator scales floor area by ventilation, then names the smallest class on this ladder (1,400, 2,100, or 3,100 CFM) — or returns NO_MATCH.
Why ventilation matters
Evaporative cooling needs air exchange. Poorly ventilated rooms underperform even large CFM ratings. Factors 1.0 / 1.15 / 1.3 are transparent screens — not a full psychrometric model.
Humidity limits
These units work best in dry climates (often cited below ~60% RH). In humid weather, cooling effect drops and rooms can feel muggy.
When the answer is NO_MATCH
If effective area exceeds ~950 sq ft on this ladder, the site returns NO_MATCH. Split zones or use a larger industrial cooler — do not force a 3,100 CFM consumer class.
Sources
VEVOR US evaporative cooler pages for 1,400 / 2,100 / 3,100 CFM with published cover (HTTP 200, 2026-09-10). Complementary to GarageBTU and DehumPts, not a duplicate intent.