An evaporative air cooler is often confused with an air conditioner. But these two devices work very differently. This guide helps you make the right choice.
How Does an Evaporative Cooler Work?
The principle is simple: water evaporates through a wet filter, absorbing heat from the ambient air and cooling it by 2 to 5°C. No compressor, no refrigerant — just water and a fan.
Evaporative Cooler vs Air Conditioner
| Criterion | Evaporative Cooler | Portable AC |
|---|---|---|
| Temperature reduction | 2–5°C (sensation) | 6–12°C (actual) |
| Power consumption | 50–150 W | 700–2,500 W |
| Installation | None | Exhaust hose required |
| Purchase price | €89–€299 | €299–€899 |
| Effectiveness in humid weather | Very low | Excellent |
When to Choose a Cooler Over an AC?
- Tight budget: costs 3–10× less to buy and run
- Dry climate: maximum effectiveness when relative humidity is below 50%
- Occasional use: a few hours at night, not to cool a whole house
Frequently Asked Questions
How much water does an evaporative cooler use?
In normal use (8h/day), a cooler uses 1 to 4 litres of water per day. Most models have a 5–15 litre tank, sufficient for an entire night.
Can an evaporative cooler replace an air conditioner?
No, except under very specific conditions (dry heat, night use, small well-insulated room). In humid heat, only a compressor-based AC will be effective.