ARI has revised three standards and one guideline. ARI Standard 210/240-2003, "Unitary Air Conditioning and Air Source Heat Pump Equipment," ARI Standard 365-2002, "Commercial and Industrial Unitary Air Conditioning Condensing Units," and ARI Guideline A-2003, "Energy Management Systems and Load Management Through Duty Cycling," have been revised and are available for free download at ARI’s website, www.ari.org, as part of ARI’s online service that now features free standards. An addendum has also been added to ARI Standard 400-2001, "Liquid to Liquid Heat Exchangers."