Upon reaching 12 to 15 years, compressor and capacitor failures account for most HVAC breakdowns

https://precisionhvacmultipoint.raidersfanteamshop.com/no-cool-or-no-heat-diagnostic-triage-determines-your-service-call-cost-immediately

A properly maintained HVAC system typically lasts 12–15 years, but component-level failure—especially compressor breakdown or capacitor burnout—often determines actual lifespan well before that