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R303.8 Required heating: When the winter design temperature in Table R301.2(1) is below 60°, every dwelling unit shall be provided with heating facilities capable of maintaining a minimum room temperature of 68° at a point 3 feet above the floor and 2 feet from exterior walls in all habitable rooms at the design temperature. The installation of one or more portable space heaters shall not be used to achieve compliance with this section.
Below is table R301.2(1)
Basically if winter design temp is below 60 degrees, You must have adequate heating to maintain 6 degrees at a point 3' from floor and 2 feet inside all habitable rooms.
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