As required by the National Appliance Energy Conservation Act (NAECA), minimum energy efficiency standards ranging from 8.0 to 9.0 EER went into effect for window-type room air conditioners on January 1, 1990. But by incorporating commonly used technologies such as high-efficiency rotary compressors, grooved refrigerant tubing, slit-type fins, subcoolers, and permanent split capacitor fan motors, 10.0 EER efficiency levels can be achieved for the most popular classes of room air conditioners without having to increase chassis size.
A new version of the ASHRAE's Standard 62, which concentrates on ventilation and indoor air quality
issues, has recently been released for pubIic review. What elements have.changed from the 1989 edition?