Overheating perimeter offices
In a curtain-wall building the perimeter behaves like a different building from the core: it gains heat all afternoon, the boxes chase it, and everyone within twelve feet of the glass is uncomfortable while the core is fine. Uneven temperatures across a floor plate are usually a solar problem before they are a balancing problem.
Solar control film reduces the load at its source. It will not fix undersized equipment, but it removes a large share of what that equipment is chasing.