Once HVAC equipment hits 15 years old, failure costs spike beyond $5,000 annually

https://precisiontrainedhvac.wpsuo.com/running-an-hvac-system-past-30-years-multiplies-failure-risk-and-replacement-cost-exposure-1

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