https://statutes.capitol.texas.gov/Docs/BC/htm/BC.601.htm
Sec. 601.002. APPLICABILITY OF CHAPTER; EXCEPTION. (a) This chapter applies only to a consumer transaction in which:
(1) the merchant or the merchant's agent engages in a personal solicitation of a sale to the consumer at a place other than the merchant's place of business;
(2) the consumer's agreement or offer to purchase is given to the merchant or the merchant's agent at a place other than the merchant's place of business; and
Sec. 601.051. CONSUMER'S RIGHT TO CANCEL. In addition to any other rights or remedies available, a consumer may cancel a consumer transaction not later than midnight of the third business day after the date the consumer signs an agreement or offer to purchase.