Determining Air Conditioning Age Capacity
42 = size on thousands of BTU 42,000 Btu = 3½ ton From 1964 through 1979 Bryant encoded age information in the serial number with the first two digits indicating week of manufacture and the letter following those first two numbers indicating the year beginning R = 1964: R = 1964 S = 1965 T = 1966 U = 1967 V = 1968 W = 1969 X = 1970 Y = 1971 A = 1972 B = 1973 C = 1974 D = 1975 E = 1976 F ...