The performance and reliability of an air conditioner mostly depends on the quality of its installation and the way it is maintained. The most reliable air conditioner brands are the ones featuring AC units that have a relatively low rate of failure, including Carrier, Lennox, Bryant and American Standard.
The typical rate of AC units breaking down within a period of five years ranges between 11 and 13 percent. However, the five-year failure rate for Goodman, Amana and York brand air conditioners is between 17 and 18 percent. The quality of the contractors who install AC units is the crucial element in determining the reliability of these devices. Therefore, brands that utilize highly trained technicians are recommended.