Man, it's hot (>90 in San Francisco). And San Francisco doesn't deal well with heat. My condo, for instance, has southeast facing windows, so it basically bakes all day. When I return home it's an oven.
In contrast, my office is cold. Always. We have lots of servers in one room and that room must be kept cool. But to keep that room cool, we must crank the air conditioning. Essentially I spend my days lowering my core body temperature in preparation for raising it all night.