到了汉代，皇宫里夏季便有了“清凉殿”，内有多重降温装置，以石头为床，用玉晶盘装冰块，还有人站在一旁对着扇扇子，清凉无比。
dào le Hàndài ，huánggōng lǐ xiàjì biàn yǒu le “qīngliáng diàn ”，nèi yǒu duōchóng jiàngwēn zhuāngzhì ，yǐ shítou wèi chuáng ，yòng yù jīng pán zhuāng bīngkuài ，háiyǒu rén zhàn zài yīpáng duì zhe shān shànzi ，qīngliáng wúbǐ 。
In the Han Dynasty, the palace had a "cool hall" in the summer, with multiple cooling devices inside, such as a stone bed, plates made from jade crystals to store ice cubes and people using fans. The coolness was incomparable.