World-Class Service: Close to home!

Dallas, Texas

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Alex Calisto – Manager of Service & Special Projects

Dwayne Morris – Service Manager


Contact Info: Dallas, Texas Service Department

2683 Lombardy Lane

Dallas, TX 75220


phone: 214-351-7500




Alex Calisto

Manager of Service & Special Projects | Team Member Since 2008

Education: The University of Texas at Austin – Bachelor of Science in Mechanical Engineering

The University of Texas at Dallas – Master of Science in Management Science

About: Alex serves as the Manager of Service & Special projects for the Dallas / Fort Worth market.  Alex began his career with DSI as a Project Manager before transitioning to the Service & Special Projects department in 2019.  During his career Alex has managed a wide array of projects ranging from light commercial, through healthcare, laboratories, semiconductor, and many markets in between.

Dwayne Morris

Service Manager | Team Member Since: 2016

Education: University of Houston – B.S. Industrial Distribution (1999)

About: Dwayne has been in the HVAC service industry since 1997. After graduating from college in 1999 he started his career with Carrier Commercial Service as a dispatcher holding roles of increasing responsibility through sales and account management to become Territory Service Manager in 2006. After helping other smaller mechanical contractors start service departments, Dwayne joined DSI in 2016 as the Service Manager organizing the service department into what it is today.

Dallas, Texas Service Department