First-time homeowners don't know how to maintain or troubleshoot inherited HVAC systems

New homeowners who inherit older cooling systems lack the knowledge to understand maintenance requirements, diagnose problems, or know when to call professionals versus attempting DIY fixes. This creates anxiety about expensive repairs, uncertainty about system reliability, and risk of costly damage from neglect or improper handling. Current solutions (generic HVAC guides, YouTube videos) don't address the specific learning curve for inherited systems with unknown maintenance history.