When do you know it is time to repair or change your heating and air cooling systems? Well, these devices also have a life span. They require repair and maintenance to keep them running, and after a while, you may have to replace the HVAC device when it entirely runs out of functioning power.
One thing worth noting is that these devices had more life span earlier on than the current devices. This could be due to technological advances or global warming. Before, HVAC had fewer functioning parts prone to lesser damage, and the pieces were more accessible to maintain than the recent advanced models.