220 ILCS 5/7-209
If a gas utility has an HVAC affiliate, the prohibition contained in this Section applies to the employees of the gas utility. While a gas utility employee is responding to a service call related to services provided under tariffs on file with the Illinois Commerce Commission, the employee of the gas utility is prohibited from marketing the services of an HVAC affiliate; provided, however, the gas utility employee may refer the customer to the telephone directory in response to specific requests for referrals. If a customer's gas appliance or gas service has been disconnected due to an emergency situation that requires immediate attention, a gas utility employee may provide to that customer a list, including contact phone numbers, that includes HVAC affiliates and non-affiliated entities that provide heating, ventilating, or air conditioning services.
220 ILCS 5/7-209