Stay cool and save a comfortable amount of money with American Standard Heating & Air Conditioning'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.