A.
When the owners of buildings designed to be occupied, or occupied, as a residence by more than two (2) families have agreed to supply heat from October 1 of each year to the next succeeding May 1, it shall be a violation of this Article unless every unit of dwelling space and every habitable room therein shall be maintained at least sixty-eight degrees Fahrenheit (68°F.) whenever the outside temperature falls below fifty-five degrees Fahrenheit (55° F.) during daytime hours from 6:00 a.m. to 11:00 p.m. At times other than those specified, interiors of units of dwelling space shall be maintained at least sixty degrees Fahrenheit (60° F.) whenever the outside temperature falls below forty degrees Fahrenheit (40° F.).
B.
Failure to so maintain the dwelling unit shall be a violation of this Article. Upon failure to provide heat as herein required, the owner of said unit or units shall be deemed to have violated this Article.
C.
In meeting the aforesaid standards, the owner shall not be responsible for heat loss and the consequent drop in the interior temperature arising from action by the occupants in leaving windows or doors open to the exterior of the building.
D.
The owner shall be obligated to supply required fuel or energy and maintain the heating system in good operating condition so that it can supply heat as required herein, notwithstanding any contractual provision seeking to delegate or shift responsibility to the occupant or third person, except that the owner shall not be required to supply fuel or energy for heating purposes to any unit where the occupant thereof agrees in writing to supply heat to his own unit of dwelling space, and the said unit is served by its own exclusive heating equipment for which the source of heat can be separately computed and billed.