The average life expectancy is in the 12 to 15-year range for most newly installed air conditioning and heating equipment. The two biggest factors affecting system longevity are the quality of the installation and the frequency of maintenance being performed after installation. Improper installation practices can drastically decrease life expectancy and increase the frequency of repairs. A lack of regular maintenance can result in dirty coils and blower wheels which can shorten the life of your compressor and/or the blower motor. With a proper installation and regular maintenance there is no reason why you should not be able to get years and years of trouble-free operation from your system.