They dribble out regularly — Energy Department rules or “standards” that require ever improving levels of energy efficiency for dishwashers, refrigerators, and much more. On Thursday, though, the Department dumped what it is describing as the “largest energy-saving standard in history” and one that “will save more energy than any other standard issued by the Department to date” — a standard governing commercial air conditioners and furnaces. These devices consume a gigantic amount of energy…