Tex. Occ. Code § 1302.253
(c) A Class B license entitles the license holder to engage in each type of air conditioning and refrigeration contracting that is endorsed on the license in relation to a system, a product, or equipment of not more than:
Added by Acts 2001, 77th Leg., ch. 1421, Sec. 3, eff. June 1, 2003.
Amended by Acts 2003, 78th Leg., ch. 816, Sec. 26.032, eff. Sept. 1, 2003;
Acts 2003, 78th Leg., ch. 1276, Sec. 14A.325, eff. Sept. 1, 2003.