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At 15C the world is by default subtropical. If higher Antarctica might be habitable. If lower everyone would be near the equator. Hard to say.
I mean, there'd be one city in Antarctica with a population of 1,000-5,000 and a bunch of small villages, but that would still only be the extent of human settlement in Antarctica.
If the world is 7 C hotter, places like Phoenix and Delhi would become uninhabitable in the summer.
The equatorial lowlands would probably be too. Singapore would have average highs between 37.2 and 39.3C. If rainfall stayed the same wet bulb temperatures could well rise above the survivable limit for humans.
Areas around the Persian Gulf and Indo-Gangetic plain are already getting close, so 7C would absolutely take them far beyond that limit.
7C colder and Yakutsk would have winters as cold as Oymyakon, and Oymyakon would likely be uninhabited.
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