Hawthorn has been a leader in the Chicago-area heating and air conditioning industry since 1986. Established in the north suburbs. Hawthorn now services the northwest suburbs and the Rockford area. Hawthorn serves both residential homeowners and new new home builders with equipment sales and service. Our services include:â?¢ Heating and Air Conditioningâ?¢ New Equipment Installationâ?¢ Hydronic and Geothermal Heating Systemsâ?¢ Duct Cleaning and Sealingâ?¢ Indoor Air Quality and Comfort Solutionsâ?¢ 24-hour Emergency Service Hawthorn is owned by Nicor Services, which means each service techician must meet rigorous requirement's for quality service. Call us for a free estimate.