Eitel Heinemann Mechanical Service Inc

AA Service Company Heating & Cooling is a full-service, family-owned and operated business that has been serving customers in Chicagoland in Illinois since 1965. It is a heating, ventilation and air conditioning contracting and service company. The company serves various residential, commercial and institutional clients. AA Service Company Heating & Cooling manages an emergency dispatch center, warehouse and parts department. It has a fleet of installation trucks. The company operates 24 hours a day, seven days a week. AA Service Company Heating & Cooling offers consulting and equipment maintenance services. It provides a line of gas-fired water heaters and air cleaners. The company offers products from various brands, such as Carrier and ClimateMaster.

For more than 30 years, O'Hare Engineering has been dealing in contracting business of air conditioners and various other systems. Located in Wheeling, Ill., the company serves its vast customer base in greater Chicagoland. O'Hare Engineering specializes in design and installation of commercial and industrial heating and air conditioning systems. The company utilizes fabrication and construction methods and some of the latest design, project management and communication technologies. It offers a host of capabilities that include computerized load design, system analysis, automated sheetmetal fabrication, computerized estimating and many more.