Each dwelling unit in every multiple residence
shall contain therein means for supplying heat in every occupied room
therein in sufficient quantity for the maintenance of a temperature
of 70º F. at knee height with due regard to regulation, ventilation,
humidity and ordinary winter conditions. When heat is supplied to
the occupants of any dwelling unit from a source within or without
the unit by someone other than such occupants, the same shall be supplied
in sufficient quantity to maintain such temperature in every occupied
room therein, with due regard to regulation, ventilation, humidity
and ordinary winter conditions, at all times between the first day
of October and the first day of the following May, inclusive, between
the hours of 6:00 a.m. and 10:00 p.m. Failure to furnish such heat
or to maintain such temperature shall be construed as a failure to
provide such means for supplying heat