The air from a fan feels cold because it increases the rate of evaporation of sweat from our skin, which cools us down. The moving air helps to carry away the heat and moisture from our skin, creating a cooling effect. On the other hand, the air from a hand fan feels warm because it does not increase the rate of evaporation of sweat and does not provide the same cooling effect as a powered fan. Instead, the motion of the hand fan can actually add a small amount of heat to the air as it moves. **

A fan can help circulate air and create a cooling effect, but it cannot fully replace an air conditioner. Air conditioners are designed to lower the temperature of the air, while fans simply move the air around. In extremely hot or humid conditions, a fan may not be sufficient to provide the level of cooling needed. However, using a fan in conjunction with an air conditioner can help distribute the cooled air more effectively and reduce the workload on the air conditioner. **

The direction of the fan should depend on the specific needs of the space. If the goal is to remove hot air and improve ventilation, then the fan should be set to exhaust air upwards. This can help to create a more comfortable environment by removing hot air and allowing cooler air to circulate. However, if the goal is to bring in fresh air or improve air circulation, then the fan should be set to intake air upwards. It's important to consider the specific needs of the space and the desired outcome when deciding on the direction of the fan. **

The rear case fan blows air inward by being mounted on the rear panel of the computer case with the fan blades facing towards the inside of the case. When the fan is powered on, it pulls air from the outside of the case and pushes it into the interior, creating a flow of air that helps to cool the components inside the case. This inward airflow helps to remove hot air from the components and expel it out through the front or top of the case, maintaining a steady flow of cool air throughout the system. **

The choice between a 120mm fan and air cooling depends on the specific needs of the system. A 120mm fan is a component of air cooling, so it is not a matter of choosing one over the other. Air cooling typically involves a combination of fans and heatsinks to dissipate heat from the CPU or other components. A 120mm fan can be a good option for providing efficient airflow within a system, but the effectiveness of the cooling solution will also depend on factors such as the size of the heatsink, the thermal design of the components, and the overall airflow within the case. **

The choice between using an air conditioner or a fan depends on personal preference and the specific situation. Air conditioners are more effective at cooling the air and reducing humidity, making them ideal for hot and humid climates. However, they consume more energy and can be more expensive to operate. Fans are a more energy-efficient option and can help circulate air, making the room feel cooler. Ultimately, the decision should be based on factors such as budget, climate, and personal comfort preferences. **

I recommend an air conditioner for more effective cooling, especially in hot and humid climates. Air conditioners are able to lower the temperature of a room more efficiently compared to fans. However, if you are looking for a more budget-friendly option or if you prefer a more subtle breeze, a fan can also be a good choice. Ultimately, the decision between an air conditioner and a fan depends on your specific needs and budget. **

There could be several reasons why your fan is not blowing air towards you. It could be due to a blockage in the fan blades, a malfunction in the motor, or a problem with the fan's settings. Check to see if there is anything obstructing the fan blades and make sure the fan is set to the correct speed and direction. If the issue persists, it may be a sign that the fan needs to be repaired or replaced. **