I'm absolutely for controls.
But assuming the energy savings from controls is because the building is a little colder rather than recognizing people used to open window when the building was out of control is not connecting the savings with the cause.
Make People Comfortable and stupid human tricks stop. Stop stupid human tricks, and you'll save MUCH more than you can from a degree or two at the stat.
And an additional often unrecognized benefit (and therefore not factored in analysis) is people's productivity goes way up.
Check out that link, Bean paints the whole picture. The guy is brilliant!