The $5000 Emergency Threshold Separates Immediate Repair from Total System Replacement
https://precision-hvac-repair-sac-apartment-sac-near-liahona-chapel3145.scriblorax.com/posts/beyond-12-years-the-50-cost-threshold-signals-when-replacement-outpaces-repair-economics
The $5000 rule for HVAC is a critical emergency go-no-go threshold: if repair costs reach or exceed half your system's remaining useful life value, immediate intervention becomes a safety and financial decision point