A.
Heating of residences. Every owner of a building or buildings occupied as residences by two or more families and where such owner has agreed to supply heat shall provide heat from the first day of October in each year to the first day of May of the succeeding year so that the temperature of the apartment where one or more persons reside shall always be kept at 70° F. or above between the hours of 6:00 a.m. and 10:00 p.m.
B.
Heating of business buildings. Every person, whether he be owner, lessor or agent of a building to be used for offices or business purposes, who shall have agreed to supply heat to the tenant, shall provide heat from the first day of October in each year to the first day of May of the succeeding year so that the temperature of said office or place of business shall always be kept at 70° F. or above between the hours of 7:00 a.m. and 6:00 p.m.; provided, however, that this subsection shall not apply to buildings or portions thereof used and occupied for trades, business or occupations where high or low temperatures are essential or unavoidable.