A facilities manager at a global real estate firm called recently. He was literally hot under the collar. Company headquarters on the U.S. West coast had been fitted two years earlier with a new HVAC system. It was designed to showcase the firm’s commitment to environmental efficiency. A month before we heard from him, temperatures at HQ started to unexpectedly spike up to the high 80s. And just as quickly subside. More than a few hot heads began to complain.