Whole-House Fan vs Central AC
A **whole-house fan** pulls cool night air through the attic—cheap where evenings cool down. **Central AC** refrigerant cooling works in humid, hot regions when outdoor air cannot cool the home.
Step by step
1. Night temps
Fan needs outdoor air cooler than indoor—desert and mild coasts fit.
2. Humidity
AC dehumidifies; fans do not—critical in Gulf and Southeast.
3. Safety
Open windows required—security and pollen tradeoffs.
Whole-house fan vs AC
Many homes use fan for shoulder seasons and AC for peaks.
- Whole-house fan: Low kWh; weather dependent; attic install.
- Central AC: Higher install; reliable comfort; higher electric bill.
Use our calculators
Common mistakes
- Running fan without open windows
- Undersized AC ductwork
FAQ
Can fan replace AC entirely?
Rarely in humid hot climates—comfort and mold risk.