The corporate authorities of each municipality may:
The term "heating, air conditioning and refrigeration contractor" does not include: (i) any private or municipally owned public utility, fuel supplier or dealer that supplies fuel and services or repairs heating or air conditioning appliances or equipment in connection with or as a part of their business of supplying the fuel used in such appliances or equipment; or (ii) any liquefied petroleum gas dealer subject to "An Act to regulate the storage, transportation, sale and use of liquefied petroleum gases", approved July 11, 1955, as now or hereafter amended, and the rules and regulations of the Illinois State Police promulgated pursuant to such Act; or (iii) any electrical contractor registered or licensed as such under the provisions of this Act or any other statute.
Any heating, air conditioning and refrigeration contractor properly licensed under paragraph (2) of this section in the municipality of his principal place of business in this State may install heating, air conditioning and refrigeration systems in any other municipality without securing an additional license, provided that such contractor complies with the rules and regulations of the municipality where such systems are installed.
65 ILCS 5/11-32-1