Safety thresholds determine whether your appliance reaches the repair or replacement boundary

https://urgentappliancerepair-residential-sac-near-house-of-jacob7561.zenbloomer.com/posts/energy-assessment-steps-reveal-why-appliance-lifespan-matters-to-operating-cost-2

The 50/50 rule measures appliance safety and function against documented thresholds: if repair cost reaches 50 percent of replacement cost and the unit is halfway through its rated lifespan, measured readings show operating limits have degraded