The Ruud Ultra Series® UASL can achieve efficiency ratings of 18 SEER. It has a two-stage Copeland compressor. The air conditioner is PrOzone™ certified, which means it exceeds world environmental standards and features R-410A, which contains no gas or compounds that might harm the ozone layer of the Earth's atmosphere, the company says. The unit has Comfort Alert™ diagnostics, which monitors and analyzes system performance. According to the manufacturer, a three-blade outdoor fan powered by a GE ECM two-speed motor on select condensing unit models significantly reduces energy bills by operating at low speed for temperatures below 85 degrees F and high speed for temperatures above 85 degrees. The patented Neutra Green finish blends quietly into yard landscapes, states the company.

Rheem Air Conditioning Div., P.O. Box 17010, Fort Smith, AR 72917-7010; 479-646-4311;

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