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Harry Hartigan was a young service technician when he founded Hartigan Refrigeration in 1976. An early focus on gasoline vapor recovery refrigeration systems quickly expanded to include process cooling and HVAC as the company grew over the next several years. In 1978, Hartigan Refrigeration was renamed Mechanical Service Corporation to reflect Harry's vision for the company's future as an HVAC service specialist.

Vice President Tim Hartigan joined MSC in 1997 as a service shop helper. He progressed through the ranks as Apprentice, Salesperson, V.P. of Sales, General Manager, Vice President, and Partner to his father, Harry. 

Tim was instrumental in cementing Mechanical Service Corporation's status as the Northeast Region's go-to specialist in complex system service and diagnostics before his untimely passing in 2019. 

In 2024, Harry Hartigan passed the baton to our new company president, Andrew Heilmann, P.E., who first joined MSC as general manager in 2013. Harry mentored Andrew from an early age when he recognized his young neighbor's natural mechanical aptitude and avid interest in the HVAC trade. Harry has stepped back from his position at the company's helm and continues to play an integral role as an advisor to our service technicians and engineering team.

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Hartigan Refrigeration is established, specializing in vapor recovery refrigeration systems for the petroleum industry

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The company is renamed Mechanical Service Corporation to reflect our expansion into HVAC service and process cooling

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Tim Hartigan joins MSC as a service shop helper and helps establish the company as the region's recognized service and diagnostics leader

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Need milestone for this era

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Professional Engineer Andrew Heilmann is named company president.

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Timothy Hartigan

1982 - 2019

Tim Hartigan, Vice President and son of company founder Harry Hartigan, was a large presence at Mechanical Service Corporation in leadership, personality, and physical stature.

Tim began his career at MSC at age 15 as a service shop helper. After completing the UANJ HVAC/R program, he worked his way up through the ranks as Apprentice, Salesperson, V.P. of Sales, General Manager, Vice President, and Partner.

He is fondly remembered for his sense of humor, love of animals, and genuine kindness. A beloved son, supportive colleague, respected leader, and loyal friend, Tim will forever be profoundly missed.

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