The main thrust of the story is that a robot finds what may be the last human in the solar system.
He then attempts to "repair" the person (robot fashion) when the human complains about the low temperature.
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By coincidence, I remember this story. It is undeniably Men are Different by Allan Bloch. It's so short I can't actually describe it any better than the OP did.
"One day, for no reason at all, he complained of the heat. I checked his temperature and decided that his thermostat circuits were shot. I had a kit of field spares with me, and he was obviously out of order, so I went to work. I turned him off without any trouble. I pushed the needle into his neck to operate the cut-off switch, and he stopped moving, just like a Robot."