Within the limitations of the building systems, Federal agencies must--
(a) Operate heating and cooling systems in the most overall energy efficient and economical manner;
(b) Maintain temperatures to maximize customer satisfaction by conforming to local commercial equivalent temperature levels and operating practices;
(c) Set heating temperatures no higher than 55 degrees Fahrenheit during non-working hours;
(d) Not provide air-conditioning during non-working hours, except as necessary to return space temperatures to a suitable level for the beginning of working hours;
(e) Not permit reheating, humidification and simultaneous heating and cooling; and
(f) Operate building systems as necessary during extreme weather conditions to protect the physical condition of the building.