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D&L is a full-service HVACR and mechanical contractor with over 40 years in business, serving commercial and industrial clients across the southeast United States.
4-L Engineering
4-L Engineering is a Richardson, Texas-based mechanical contractor with over 60 years of experience in HVAC, plumbing, and mechanical systems for commercial, industrial, and multi-family facilities.
4-L Engineering is a mechanical contracting company based in Richardson, Texas, serving the Dallas-Fort Worth Metroplex. The firm has operated for over 60 years, providing engineering, contracting, and service work across air conditioning, plumbing, and mechanical systems.
The company's technical scope covers mechanical engineering, HVAC, and plumbing systems. Its work spans multi-family, commercial, and industrial facilities, approaching projects with a holistic building envelope perspective. 4-L Engineering offers service agreements and operates on a 24/7 basis.
For data centre operators, the company's long-standing mechanical expertise - particularly in HVAC and plumbing - represents core infrastructure competencies critical to facility operations and environmental control.
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