Once HVAC equipment hits 15 years old, failure costs spike beyond $5,000 annually
https://sacramentoprecisionhvacrepair-pros-near-westacre-park6826.lumenforgex.com/posts/no-cool-or-no-heat-diagnostic-triage-determines-your-service-call-cost-immediately
The $5,000 rule is a failure-risk threshold: once your HVAC system reaches age 15, running it beyond that point exposes you to replacement-cost shock far exceeding $5,000, plus the breakdown liability of a mid-cycle failure during Sacramento's