A. General: It shall be the duty of every person owning or controlling the heating plant which furnishes heat to any tenement house, apartment house, hotel, lodging house, rooming house or boarding house, in which the heat is furnished from a heating plant used in common for the purpose of heating the various rooms and apartments therein and such heating plant is under control or supervision of such owner or person in control of such building, to furnish heat to such rooms and apartments from October 1 of each year to June 1 of the succeeding year, so that the occupants thereof may secure, without such undue restriction of ventilation as to interfere with the proper sanitary conditions, a minimum temperature of sixty degrees Fahrenheit (60°F) at six thirty o'clock (6:30) A.M., sixty five degrees (65°) at seven thirty o'clock (7:30) A.M. and seventy two degrees (72°) at eight thirty o'clock (8:30) A.M., and thereafter until ten thirty o'clock (10:30) P.M., averaged throughout the apartment; provided, that written notices of complaint concerning lack of heat in such room or apartment shall first be given to such person by registered mail before a violation of this subsection shall be deemed to exist. (1965 Code § 16-2.01)
B. Factories, Moisture Content: It shall be the duty of every person owning or controlling the heating plant which furnishes heat to any factory or workshop to maintain a temperature within such factory or workshop of not less than sixty eight degrees Fahrenheit (68°F) without such undue restriction of ventilation as to interfere with proper sanitary conditions therein; provided, however, that this requirement shall not apply to any factory or workshop where the business conducted therein is of such a nature that a higher or lower temperature than sixty eight degrees (68°) Fahrenheit is necessary or expedient for the work, trade, occupation or manufacturing processes of the business as conducted therein; and provided, further, that in all such cases, when such higher or lower temperature is necessary or expedient, the moisture content of the air shall be increased where the temperature is maintained below sixty eight degrees (68°) Fahrenheit or decreased where the temperature is maintained above sixty eight degrees (68°) Fahrenheit in the proper amount to maintain a wet bulb temperature between fifty four degrees (54°) and fifty eight degrees (58°) Fahrenheit, and in the case of special manufacturing processes where it is necessary or expedient to maintain a wet bulb temperature below or above the extremes herein set forth, the Health Officer shall prescribe and enforce such reasonable precautions and safeguards as will meet the requirements of such special manufacturing processes without endangering the health of the occupants of such factory or workshop. The manner of determining the temperature in all cases where the temperature to be maintained is sixty eight degrees (68°) Fahrenheit shall be the same as in the preceding subsection, and in all other cases shall be in such practical manner as the health officer may determine. (1965 Code § 16-2.03)
C. Offices, Stores and Places of Employment: It shall be the duty of any person owning or controlling the heating plant which furnishes heat to any office, store or other place of employment, to maintain a temperature within such office, store or place of employment of not less than sixty eight degrees (68°) Fahrenheit without such undue restriction of ventilation as to interfere with proper sanitary conditions therein, between the hours of eight thirty o'clock (8:30) A.M. and six o'clock (6:00) P.M., from October 1 of each year to June 1 of the succeeding year, Sundays and full legal holidays excepted. (1965 Code § 16-2.04)