How to cool down in hot weather without air conditioning?

The general method of cooling a room without air conditioning is as follows:

1, using air-conditioning fan, that is, fan+water, through the continuous evaporation of water to absorb heat to achieve a certain degree of cooling;

2. Buy large blocks of ice from the market and put them indoors to absorb heat and cool down by melting ice and evaporation of water;

Sprinkle water on the floor of the room properly, and then turn on the fan in the room to cool down.

These methods basically use the principle of "water evaporation absorbs heat" to cool down, and at the same time, it will lead to higher and higher indoor air humidity, so it is necessary to open doors and windows regularly for ventilation, and the cooling effect can be very limited.