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5 Ways to Cool Down Without AC in Hong Kong

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5 Ways to Cool Down Without AC in Hong Kong - 1
Hong Kong summers are often characterized by high temperatures and humidity. Running the air conditioner for long periods is not only power-consuming but also not environmentally friendly. Below are 5 'air-conditioner-free cooling' methods compiled, relying on common household items and simple operations to quickly lower the perceived temperature on stuffy days.

1. Fan × Evaporative Cooling

  • Operation: Quickly mop the floor with a wet mop, or place a basin of ice water/a sealed bag of ice in front of the fan
  • Principle: When water evaporates, it absorbs latent heat, and the fan then brings the low-temperature airflow to the surface of the human body, which can immediately reduce the temperature by 2–3 ℃
  • Note: If the indoor humidity is already higher than 80% (after rain, during the humid season), avoid adding more moisture

2. Eliminate Indoor Heat Sources

  • Turn off computers, game consoles, and set-top boxes that are on standby for long periods
  • Switch to LED cold light sources, which can significantly reduce heat
  • Turn off and unplug electric stoves and rice cookers immediately after cooking

3. Keep Ventilation

  • Before sunrise/when nighttime temperatures are low: Open windows diagonally + use a circulation fan to blow inward, introducing cooler outside air
  • When it's hotter outside during the day: Close windows and turn on the exhaust fan to draw out accumulated indoor heat, preventing hot air from flowing back in
  • If ventilation openings are insufficient, you can slightly open the main door and coordinate with the windows

4. Make good use of curtains

  • For west-facing or top-floor units in the hot summer: Install bamboo blinds, metal shutters, or sunshade nets outside the window to block direct radiant heat
  • Use high light-blocking and heat-insulating curtains; drawing the curtains before leaving home can make the indoor temperature 2–5 ℃ lower than "full-day sun exposure"

5. Humidity Control to Aid Cooling

  • In Hong Kong, the relative humidity in summer often exceeds 75%; the human body feels most comfortable when the humidity is below 60%.
  • Running a dehumidifier for 2–3 hours during the day to maintain humidity at 55–60% can make a 30 ℃ environment feel as if it's 2 ℃ cooler.

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