Md. Code, Pub. Safety § 12-510

(a) (1) In this section the following words have the meanings indicated. (2) (i) “Hotel” means an establishment that offers sleeping accommodations for compensation. � (ii) “Hotel” does not include a bed and breakfast establishment. (3) “Master control device” means: (i) a control that is activated when a person enters the room through the primary room–access method; or (ii) an occupancy sensor control that is activated by a person’s presence in the room. (b) This section applies only to the new construction of hotels. (c) (1) Each hotel guest room shall be equipped with a master control device that automatically turns off the power to all of the lighting fixtures in the guest room no more than 30 minutes after the room has been vacated. (2) A master control device may also control the heating, ventilation, or air conditioning default settings in hotel guest rooms 30 minutes after a room has been vacated by: (i) increasing the set temperature by at least 3 degrees Fahrenheit when in the air conditioning mode; or (ii) decreasing the set temperature by at least 3 degrees Fahrenheit when in the heating mode. (d) The Department shall adopt the provisions of this section as a part of the Maryland Building Performance Standards.