Options side by side
Evaporative (swamp) cooling
Uses water evaporation to drop air temperature. Strong in dry Central Valley heat; weaker when humidity climbs.
DX refrigerated cooling
Packaged RTUs or splits that cool by refrigeration. Predictable temps for offices, mezzanines, and sensitive stock.
Honest pros & cons
Evaporative
Pros
- • Lower operating cost in dry heat
- • High airflow comfort for large volumes
- • Often lower install cost than full DX for the whole shell
Cons
- • Performance collapses as humidity rises
- • Adds moisture — bad for some packaging and corrosion-prone stock
- • Water quality and pad maintenance are real OpEx
- • Not a precision environment for IT or offices
DX refrigerated
Pros
- • Predictable temperatures independent of wet-bulb
- • Better for office mezzanines and conditioned zones
- • Supports tighter IAQ filtration strategies
Cons
- • Higher install and energy cost for large shells
- • Roof RTU changeouts bring crane/curb complexity
- • Overkill if the space only needs spot comfort a few months a year
Verdict
What we recommend
Use evaporative for dry-climate warehouse comfort when moisture is acceptable. Use DX for offices, product limits, or when humidity weeks kill swamp performance. Hybrids (DX offices + evaporative shell) are common and honest. Precision designs light industrial mechanical — not mythical “free cooling” promises.
FAQs
Does evaporative work in the South Bay?
Sometimes for limited hours, but marine-layer humidity reduces effectiveness versus inland Central Valley sites. Measure expectations carefully.
Can we cool only the shipping office with DX?
Yes — zoning the occupied pockets with DX while leaving the shell on evaporative or ventilation is a frequent pattern.
Which is greener?
It depends on water vs electricity, hours of use, and utility mix. We compare operating models on your schedule, not a slogan.
Keep comparing, then decide
Intent chaining so this page never dead-ends — learn first, evaluate next, then bid.
Updated 2026-07-15