Beyond 12 years, the 50% cost threshold signals when replacement outpaces repair economics

https://precisiontrainedhvac.wpsuo.com/incorrect-tonnage-selection-voids-manufacturer-protection-on-2000-square-foot-homes

The ideal age to replace an HVAC system hinges on documented cost-ratio data: once repair expenses exceed 50% of replacement cost in a single season, replacement becomes the data-backed threshold