Most Garage Door Manufacturers supply springs rated at 10,000 cycles. The average life of a garage door spring varies based on the number times the garage door cycles(opens and closes.)Daily usage of 1 to 3 times a day, would have an average spring life of approximately 7 to 10 years. Increased cycles, and temperature changes as well as low grade imported spring wire, will reduce the average spring life by 50%.These variables will cause the spring wire to crystalize and snap at the weakest point. If you have a 2 spring system, it is best to replace both springs to avoid having to repeat the replacement cost and labor.
Consider this Option
If your door cycles(opens and Closes) more than 3X a day,add the High Cycle Upgrade to your order This option is equivalent to purchasing a second Pair of springs for cost of the upgrade.This inexpensive option will double the spring life from 7/10 yrs. to 18/20 yrs