Humans operate in a tiny range of preferred internal temperatures. we can tolerate overcooling routinely recovering from long periods of hypothermia .
人类偏好的运作温度范围极小。我们可以忍受太冷，经过长时间失温，通常也能复原。
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At the same time, adding some carboxymethylcellulose sodium as thickener not only could improve the stability of thermal storage system, but also could reduce the overcooling.
Wherever in the room, or the passage, even at the air outlet, the air always appear well balanced and comfortable, absolutely free from the overheating or overcooling phenomenon.