All BPI GoldStar Contractors commit to employing BPI certified professionals and doing work according to BPI Standards. BPI certified professionals have passed BPI's rigorous written and in-field practical exams that verify their knowledge and skills in building science solutions. They know how to improve energy efficiency while providing important safety functions such as mold prevention, carbon monoxide testing, and combustion appliance safety checks. They also have the know-how to help prepare your home for solar, geothermal, or other types of energy upgrades.