The Diligent Mechanical Services, a fourth-generation, privately owned and operated company since 1928, is New York’s preeminent provider of plumbing, heating & air conditioning, fire protection and green solution services. The company is dedicated to preserving and building its distinguished reputation for professionalism and reliability. Over the years the company has played a vital role in New York City’s construction industry. The company’s 4 divisions – Diligent Plumbing, Diligent Heating & Air Conditioning, Diligent Fire Protection and Diligent Green Solutions.