Hearsay. And quote a bit different from your original claim:
“Marina tells of LHO staying inside and wearing only his underpants in an effort to stay cool in New Orleans”
The underpants episode was a different one. It involved him “training” to be a soldier for Castro. My original statement was “off the top of my head” (from my memory). My memory associated the two episodes incorrectly. That’s part of being human.
The point is (as I stated earlier) that this behavior is not what one would expect from someone who (as you suggested) might adore hot weather.