Synopsis As Introduced Creates the Illinois Energy Efficient Furnace Act. Sets out the applicability of the Act. Provides that no later than one year after the effective date of this Act, the Department of Commerce and Economic Opportunity shall promulgate rules establishing minimum efficiency standards for residential furnaces. Sets out minimum efficiency standards for residential furnaces. Provides for exceptions to the provisions of this Act. Provides that no later than 6 months after the effective date of this Act, the Department, in consultation with the Attorney General, shall determine if State implementation of residential furnace standards is preempted by federal law. Provides that the Department may adopt rules to establish increased efficiency standards for residential furnaces in the State. Provides for testing and labeling of all residential furnaces sold in the State in order to ensure compliance with the Act. Sets out penalties for violations of the Act. Effective immediately.