Cities of the World Where You Don’t Need AC or Heat, Mapped
medium.com
medium.com
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> Sydney, Australia
Tomorrow it'll be 40C in Sydney....?
Depends where you are in San Diego. If you are within 10 miles of the coast, you can get away without either A/C or Heat.
To anyone reading this, this claim is certainly false. I grew up in University City in SD and remember no one that had AC. Ceiling fans were totally normal, but nothing more.
Personally I enjoy a slightly cooler temperature, but still above freezing. Edinburgh is my perfect climate. August highs rarely above 25C and January lows rarely below 2C. Jacket in winter and a fan in summer are all you need to live comfortably.