N.Y. Exec. Law § 610

§ 610. State certified installers. Manufacturers and retailers may as\na condition of the sale of a manufactured home require that the home be\ninstalled by a state certified installer and may recommend a particular\ninstaller or installers. Manufacturers shall not void a warranty for a\nmanufactured home if the home buyer utilizes a state certified\ninstaller. It shall be a violation of this article to restrict a\nhomebuyer from using any state certified installer chosen by the\nhomebuyer, or to void a warranty for a manufactured home if the\nhomebuyer utilizes a state certified installer.\n