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602.3 Heat supply. Heat shall be supplied continuously at the temperature and in the rooms specified in Section PM-602.2 from October 1 to April 30 inclusive, and in addition thereto during the months of May or September when the outside temperature falls below 60 degrees F (15 degrees C) by every owner or operator of every two- family dwelling, multiple-family dwelling and rooming house except where there are separate heating facilities for each dwelling unit, whose facilities are under the sole control of the occupant of such dwelling unit.
1. When the outdoor temperature is below the winter outdoor design temperature for the locality, maintenance of the minimum room temperature shall not be required provided that the heating system is operating at its full design capacity. The winter outdoor design temperature for the locality shall be as indicated in Appendix D of the International Plumbing Code.
2. In areas where the average monthly temperature is above 30°F (-1°C) a minimum temperature of 65°F (18°C).