The purpose of these rules is to establish efficiency standards and design requirements for certain products sold or installed in the state assuring consumers and businesses that such products meet minimum efficiency performance levels thus saving energy and money on utility bills. This chapter applies to products sold or offered for sale, lease, or rent in the state, except those sold wholesale in Washington for final retail sale outside the state and those designed and sold exclusively for use in recreational vehicles, or other mobile equipment. The standards and design requirements apply regardless of whether the product is installed as a stand-alone product or as a component of another product.