Choose a new level of cool. Stay cool and save a comfortable amount of money with American Standard's line of Allegiance® air conditioners. Our air conditioners range in efficiency from 13 to 18+ SEER among the highest efficiency ratings in the industry. Our Allegiance® family offers a wide range of comfort choices, plus exclusive state-of-the-art technology that quietly, meticulously and efficiently conditions your air. Get ready for a level of comfort you and your family may never have experienced before. Allegiance® 18 Our top-of-the-line choice for efficiency and cool, quiet comfort. Allegiance® 16 Generous two-step cooling and incredible energy efficiency. Allegiance® 15 Our most economical single-stage air conditioner. Allegiance® 14 Impressive comfort and energy savings. Allegiance® 13 Reliable American Standard cooling at its most affordable. Allegiance® 13 Reliable American Standard cooling at its most affordable.