Those who need the most up-to-date information about air conditioning and refrigeration equipment performance requirements should know that theAir-Conditioning and Refrigeration Institute (ARI) has published ARI Standard 390-2001 "Single Package Vertical Air-Conditioners and Heat Pumps," a new equipment performance standard, and revised ARI Standard 340/360-2000 "Commercial and Industrial Unitary Air Conditioning and Heat Pump Equipment."

Both are available for free on ARI's Web site