Addison continues to lead the industry in product development with over eight generations of DOAS products. From our highly configurable PR Series, modular split MA/MC series, and the all-new compact AK Series, Addison offers ultimate performance configured for customer applications. The Addison name has become synonymous with innovative design, quality manufacturing and dependable service. That’s our heritage at Addison Products Company. It’s what we call The Addison Advantage.