Service call costs rise sharply once equipment surpasses 12-year reliability threshold

https://precision247yearround.capitaljays.com/posts/airflow-balancing-measurement-reveals-why-hvac-repair-costs-vary-so-widely

The average HVAC service call in Sacramento costs between $75 and $150 for diagnosis, but that initial fee only scratches the surface—the true cost depends entirely on your equipment's age and remaining service life