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Shamrock Heating and Air Conditioning has proudly serves DuPage and Kane Counties for over 40 years. As a leader in the HVAC industry we are compelled to uphold a greater standard of excellence than other companies. When you call Shamrock you will get an intelligent customer service representative …
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John Alan Macnider founded Alan Heating Air Conditioning, Inc. in Elmhurst in 1948. With ambitions to create a company known for customer satisfaction, he instilled his belief that a customer is not just a "sale" but a lifelong friend. Roger Alan Macnider joined his father in 1949 and has carried t…
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