Coils don't last forever. Knowing when to replace one — rather than nurse it along — saves money and avoids sudden failures.
Watch for these signs.
Persistent refrigerant leaks
Repeated leaks, especially at multiple points, signal a coil near the end of its life. Constant recharging is a false economy. Consider a replacement coil.
Visible corrosion
Heavy green corrosion or 'formicary' pinhole corrosion weakens tubes and precedes leaks. Coastal and corrosive sites see this sooner — where copper coils last longer.
Lost capacity
If the system struggles to cool despite clean fins and correct charge, the coil may be fouled internally or degraded. Falling performance is a replacement cue.
Age and repair cost
When cumulative repair costs approach the price of a new, better coil, replacement wins. A modern coil often runs more efficiently too.
Key takeaways
- Repeated leaks mean end-of-life
- Corrosion precedes pinhole failures
- Unexplained capacity loss is a warning
- Replace when repairs approach new-coil cost
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