Construction question and AC

I live in a small condo building with two stories.  Although we live in so cal it’s a particularly warm microclimate surrounded by open space.  I installed AC a few years back because I was suprised by how hot it got.  My downstairs neighbors don’t seem to be as bothered by it.  I know they are probably cooler because they are downstairs, but is it possible my AC is spending energy cooling their unit too?  I cool my air, theirs rise into my unit, etc.

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