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I've looked into it a bit, and it seems like there are multiple ways you can do the barrier--on the attic ceiling, floor, or both...when I said "on top of the attic floor", what I mean is it would go like the "Over-Insulation Method" in the pic below:

Are these something like what you're talking about? This or this?

Yes, I'm in the East Bay. But even the East Bay has huge climate differences. Meanwhile SF and the Peninsula barely get a summer at all--there are always some nice days in the fall but June-July are often cold (by CA standards), windy, and gray. I'll consider wall/window AC. Seems like...

And the foil radiant barrier would go on top of the (hypothetical) insulation on the (hypothetical) attic floor, correct?

Thanks. I'm in climate zone 3 in coastal California, but that zone includes areas which have very different climates, including a lot of places where it gets far hotter than it ever gets near me. Even the Bay Area gets radically different conditions because of all the microclimates, so 10 miles...

Thanks for the detailed response. You say "No matter how much insulation you add, if it's always 90 degrees outside, eventually you're going to reach 90 degrees." The thing about where I live is that even on days when it does hit 90 (pretty rare), it cools down a lot at night. It's almost never...

I was hoping to avoid rabbit holes! Seriously though, I get that it's all a little more complicated than "add insulation and be done with it" and I appreciate these detailed responses. I'm thinking whatever else I do, some kind of fan/vent system will be crucial. In terms of humidity, I'm...

Understood. Actually, I was thinking adding a ceiling would be what makes the most difference, if anything. As it is now it's a pitched roof with exposed rafters/joists, so adding a ceiling will create a lot of space between the roof and the room itself. For comparison, my house stays pretty...

Sure, but my initial thought was to try to do this without AC, that's the gist of my question. But if reducing temps really isn't possible more than a few degrees with only insulation, fans, etc. I might consider AC.

Ideally it would be a home office as well as a music room of sorts, so I want it to be a place I can spend time comfortably. But actually the main reason I'm concerned about the heat is I want to keep some instruments (drums, guitar), stereo system, and vinyl records in the space, and I'm...

Thanks for the reply. I was feeling optimistic after reading another thread: https://www.garagejournal.com/forum/threads/should-i-insulate-the-ceiling-in-my-detached-garage.511571/ Where a bunch of people say insulation could help a lot. Someone even says his non-AC garage keeps 10 degrees...

How much can insulation and a ceiling reduce the temperature inside a detached garage? I have an unfinished garage/workshop (plywood/pegboard interior walls, no ceiling just a pitched roof with exposed beams, stucco exterior) and I'd like to convert it into a work/hangout space where I can keep...