GLOSSARY
Outdoor AC vs Mist Cooling
Outdoor AC and high-pressure mist cooling solve different problems. AC tries to close and condition an open space (rarely effective, always expensive); mist cooling drops guest-zone air 8–12 °C via adiabatic evaporation at one-tenth the energy.
Also known as: Mist vs AC · Outdoor AC alternative · Open-air cooling comparison
Side-by-side
| Dimension | Outdoor AC (split or packaged) | High-pressure mist cooling |
|---|---|---|
| Cooling principle | Mechanical refrigeration | Adiabatic evaporation |
| Open-air effective | No — heat reloads instantly | Yes — cools guest zone |
| Power per 300 m² | 30–45 kW | 2.2 kW |
| Capex for 300 m² | 250–400M IDR | 17–30M IDR |
| Opex (6h/day) | 270–400k IDR/day | 20–30k IDR/day |
| Visible equipment | Wall-mounted heads, ducts | Invisible nozzle lines |
| Guest noise | 55–70 dB fan noise | Silent (40–45 dB pump, remote) |
| Refrigerant risk | Yes (R410A, R32 regulation) | No — water only |
| Monsoon operation | Equipment degrades outdoors | Engineered for tropics |
Where AC still wins
Fully enclosed indoor spaces (hotel rooms, offices, malls’ air-locked zones) — mist cooling is the wrong physics for these. Anywhere with ≥ 3 walls and a ceiling that seals, conventional AC is correct. The distinction is always about envelope integrity, not building type.
The real decision
For Indonesian hospitality, retail, and residential outdoor zones (terraces, pool decks, event lawns, mall atria, villa verandas), the question is rarely “AC or mist cooling?” — it’s “mist cooling or nothing?” Because outdoor AC has been tried and demonstrably fails in tropical open-air conditions. Guest comfort either happens via mist cooling or doesn’t happen at all.