The time it takes for an electric fan to cool down a room after turning off heaters and air conditioners in Malaysia's weather condition can vary depending on several factors, including the room size, insulation, initial temperature, humidity levels, and the fan's power and speed. Malaysia generally experiences a tropical climate with high humidity and temperatures that can be warm throughout the year.
Since fans do not actually lower the temperature of the air in the room like air conditioners or heaters, they work by providing a cooling effect through increased air circulation and evaporative cooling on the skin. The perceived cooling effect depends on the difference between the air temperature and your body temperature. If the room is already at a comfortable temperature, the fan can help maintain that comfort level and create a pleasant breeze.
Here are some considerations:
Initial Room Temperature: If the room is excessively hot due to the heat from heaters or natural outdoor temperature, it may take longer for the fan to provide noticeable cooling. However, if the room is at a comfortable temperature, the fan's cooling effect can be more immediate.
Humidity: High humidity levels can reduce the effectiveness of evaporative cooling from the fan. In Malaysia's humid climate, the fan may not feel as refreshing as it would in a drier environment.
Fan Power and Speed: The type and power of the fan also play a role. A larger, more powerful fan or a fan with multiple speed settings may cool the room faster than a smaller, less powerful one.
Room Size and Air Circulation: The size of the room and the placement of the fan can impact the cooling effect. Proper placement of the fan to ensure good air circulation can lead to quicker cooling.
As an estimate, if the room is at a moderately comfortable temperature, and you are using a typical electric fan in a reasonably sized room, you might start to feel a noticeable cooling effect within a few minutes of turning on the fan. However, achieving a significantly cooler room temperature solely with a fan may take more time, especially in hot and humid weather conditions.
To enhance the cooling effect of the fan, you can also consider opening windows during cooler parts of the day to allow fresh air to circulate. Additionally, using techniques such as creating cross-ventilation or placing a bowl of ice in front of the fan can help boost the fan's cooling capabilities.