Well has such thing occured for once or has happened few times now?
Truly I never heard of any such thing nor did it happen with me anytime.
The AC was already on when you got in and that time you were sweating, then suddenly how you could stop sweating.
May be it has too hot outside, and for the first half hour your body was still cooling down and at that time you continued to sweat. But later on your body temperature stabilized and you stopped sweating.
It can be one reason.
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Saunas & Steambaths