Here is the NJ statute:
seems it only applies to 3 or more apartments in a building..
so what does you lease say? Is there ONE furnace in the building? and is the landlord heat off too? If not then you might be able to withold the rent.
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m. To require in buildings, designed to be occupied, or occupied, as residences by more than two families and when the
owners have agreed to supply heat, that from October 1 of each year to the next succeeding May 1, every unit of dwelling
space and every habitable room therein shall be maintained at least at 68` F. whenever the outside temperature falls below
55` during daytime hours from 6 a.m. to 11 p.m. At times other than those specified interiors of units of dwelling space shall
be maintained at least at 55` F. whenever the outside temperature falls below 40`.
In meeting the aforesaid standards, the owner shall not be responsible for heat loss and the consequent drop in the
interior temperature arising out of action by the occupants in leaving windows or doors open to the exterior of the building.
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.