熱がる

あつがる【暑がる･熱がる】

feel the heat (very much); feel hot; complain of the (summer) heat; swelter.

●まだ 5 月なのに, 彼は暑がってクーラーを使っている. It's still only May, but he's got the air conditioner on because he finds it too hot for comfort.

・まだ 5 月なんだから, そんなに暑がるな. It's still only May; don't complain so much about the heat.