ATTENTION TEXAS HVAC CONTRACTORS!! 

Heat Load Calculations in Texas (Manual J)
Administrative Rules of the Texas Department of Licensing and Regulation
16 Texas Administrative Code, Chapter 75
75.70. Responsibilities of the Contractor/Licensee.
(c) The design of a system may not be subcontracted to an unlicensed person, firm or corporation.
The full text of the Texas AC law and rules can be found on the TDLR website https://www.tdlr.texas.gov/acr/acr.htm