Action first
Air cooler vs dehumidifier
Short answer
Use an evaporative air cooler only in relatively dry air. A dehumidifier can improve humid conditions but releases heat into the room.
How to choose
- ✓Check humidity before choosing.
- ✓Avoid evaporative coolers in already humid rooms.
- ✓Expect a dehumidifier to warm the air slightly.
- ✓Use AC when both active cooling and moisture removal are needed.
Why it works
This advice follows US Department of Energy guidance and the underlying principles of humidity and evaporation.
Important exceptions
Safety, health, weather and the design of your home can change what is appropriate. Stop if an action makes conditions worse.
Related guides
Sources & evidence
Reviewed 2026-08-21
- US Department of Energy: Home cooling ↗
Supports: Fans, ventilation, evaporative cooling, air conditioning, shading and energy use.
official guidance · Accessed 2026-08-21