Once you go to work for an A/C contractor, you must register with the Texas Department of Licensing and Registration (TDLR). The A/C contractor you work for is also regulated by the TDLR. The A/C license holder must complete continuing education each year. The TDLR works very hard to ensure we operate with the highest quality of workmanship and ethics. They are constantly working to catch technicians that operate without a license. Without TDLR, the wages would drop due to unlicensed workers taking jobs.