14X-8-802.2 Residential occupancies.
Dwelling units and sleeping units must be provided with permanent heating equipment capable of maintaining a room temperature of 68ºF (20ºC) in all habitable spaces, toilet rooms, and bathrooms when the outdoor temperature is -7ºF (-22ºC). Neither cooking appliances, domestic water heating equipment, nor portable space heaters may be used to provide the required heating capacity.