The Allegiance 18 has a SEER rating of up to 18.90. The sound levels of the fan system go down to 72 decibels; the variable-speed condenser fan motor operates at 440 rpm on low speed. According to the manufacturer, the dual Duration™ compressors offer two-stage cooling and greater humidity control through the Comfort-R mode of operation with either the company’s variable-speed Freedom 80 or 90 furnace or variable-speed air handler. The two-row Spine Fin™ coil provides maximum surface area for more efficient heat transfer capabilities, states the company.

American Standard Heating and Air Conditioning, Unitary Products Group, 6200 Troup Hwy., Tyler, TX 75707; 903-581-3300; 903-581-3482 (fax);

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