This chapter does not apply to a person who engages in air conditioning and refrigeration contracting on:
(1) a portable or self-contained ductless air conditioning product that has a cooling capacity of three tons or less;
(2) a portable or self-contained heating product that does not require the forced movement of air outside the heating unit;
(3) environmental air conditioning equipment that is intended for temporary use and is not fixed in place; or
(4) a residential refrigerator, freezer, or ice machine.
Official text of the Texas Occupations Code as published by the Texas Legislative Council.