The nickname "swamp cooler" comes from the slightly musty smell that can occur if the cooler isn't properly maintained—reminiscent of swamp air. This happens when water sits stagnant in the reservoir, when pads become moldy, or when mineral deposits build up in the system.
However, a well-maintained evaporative cooler produces fresh, clean air with no unpleasant odors. The name is somewhat misleading because these coolers actually work best in the opposite of swamp conditions—hot, dry climates.
To prevent any "swampy" smells:
- Change the water in the reservoir weekly
- Clean or replace pads at least once per season
- Use cooler treatment tablets to prevent bacterial growth
- Run the fan only (without water) for 15-30 minutes after cooling to dry the pads
- Drain the system completely when not in use for extended periods
Despite the unappealing nickname, evaporative coolers are an excellent, efficient cooling solution when properly cared for. Many people in the Southwest prefer the term "evaporative cooler" or simply "evap cooler" for this reason.