Thermal Performance is a quality window and door company specializing in replacement window sales and installations. We are currently serving the South Jersey / Central New Jersey area and the Philadelphia Metropolitan area. Thermal Performance has made its name in Southern New Jersey by being a family business, providing personal replacement door and window service for a number of years. Thermal Performance guarantees to double the discounts of any competitors offering a lower price, provided the competitor has been in business a minimum of ten years, a member of the better business bureau and offer comparable products.