The first is the more common physical cooling method. In fact, the ancients did not have any clever methods. We can imagine. What will we do if we don't have a fan air conditioner now? There is a saying that peace of mind is naturally cool. It is true that people in ancient times used cattail fans to create wind and promote the dull airflow to take away sweat from the body surface.
In the same way, things like summer sleeping mats and bamboo couches are also artifacts invented by the ancients to keep out the cold. Sleeping mats in summer can well absorb the heat emitted by the body and make it volatilize, thus achieving the effect of cooling off the heat. It is not appropriate to say that the current temperature is actually very hot because of climate change. The ancient summer was not that hot. For ancient people, summer is also a very worrying thing.
Long ago, people had the consciousness of using ice, such as ice formed on rivers or lakes in winter. Pick it up and put it in the freezer to keep warm, and then take it out in summer. Although this fresh-keeping method is not as reliable as the refrigerator, it still has the most basic functions.
Ordinary people spend their summers with cattail leaf fans, sleep on a mat and come out to enjoy the cool at night. For the princes and nobles at that time, there was such a thing as air-conditioned rooms. There was a saying of "cool breeze hall" in the Tang Dynasty. Although it was not as advanced as the current air-conditioned room, the cooling effect of cool breeze hall was good for people at that time. This ancient air-conditioned room used water and waterwheels as the media to take away the hot air in the room, thus making the whole room cool, which is also the embodiment of the wisdom of the ancients.