On plateau projects (Tibet, Andes, highlands), enclosures still need 7×24 non-over-temp — but cooling power drops with altitude.
1. Why capacity drops
Higher altitude means lower air density (worse condenser heat rejection) and changed compressor pressure ratio, lowering volumetric efficiency. Typically ~5–10% capacity loss per 1000m, depending on model.
2. Derating table
| Altitude | Capacity | Action |
|---|---|---|
| 0–1000m | 100% | Standard |
| 1000–2000m | ~90–95% | +10% margin |
| 2000–3000m | ~80–90% | Bigger unit/fan |
| 3000–4000m | ~70–80% | Custom motor/fan/refrigerant |
3. HCK plateau solution
- Customize motor/fan airflow and refrigerant charge per altitude;
- Enlarge condenser if needed;
- Wide-temp -40~+55℃ for large day-night swing;
- Non-standard drawing for stable 2000–4000m.
See HCK cabinet AC products or contact Haocheng for altitude sizing.