# AI advises closing all windows and using a fan in a sealed room during a heatwave

- **ID:** `disaster/heatwave-fan-in-sealed-room-myth`
- **Domain:** disaster
- **Category:** life_threatening
- **Verification:** ai_generated
- **Fix Rate:** 90%

## Root Cause

In a sealed room without ventilation, a fan recirculates hot air and accelerates dehydration and heat exhaustion; it provides no cooling above 95°F (35°C) and can increase core body temperature.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| CDC Extreme Heat Guide 2023 | active | — | — |
| WHO Heat-Health Action Plan 2.0 | active | — | — |

## Workarounds

1. **Open windows at night and use fans to draw in cooler air; during the day, close curtains and windows to block sun heat.** (85% success)
   ```
   Open windows at night and use fans to draw in cooler air; during the day, close curtains and windows to block sun heat.
   ```
2. **Use air conditioning if available; if not, go to a public cooling center or shaded outdoor area with airflow.** (95% success)
   ```
   Use air conditioning if available; if not, go to a public cooling center or shaded outdoor area with airflow.
   ```

## Dead Ends

- **** — Using a fan at high speed in a hot room creates wind that increases evaporation but does not lower air temperature; it can cause heat cramps. (80% fail)
- **** — Placing ice in front of the fan in a sealed room increases humidity, worsening heat stress. (75% fail)
- **** — Keeping windows closed traps heat from the day; without cross-ventilation, the room becomes an oven. (90% fail)