Why it works
How air conditioning works
Short answer
Air conditioning uses a refrigeration cycle to collect heat indoors and release it outdoors, while usually removing moisture.
The simple explanation
- ✓The evaporator absorbs indoor heat.
- ✓The compressor and refrigerant carry that heat.
- ✓The outdoor condenser releases it outside.
- ✓Closed windows help prevent cooled air escaping.
Why it works
This advice follows US Department of Energy guidance and the underlying principles of refrigeration and dehumidification.
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