05/20/2026
This is exactly why we recommend NOT using bleach in HVAC drain lines. The fumes from bleach can become trapped inside the air handler and over time begin attacking the evaporator coil. Once corrosion starts, the coil fins and tubing become brittle, leading to premature coil failure, refrigerant leaks, reduced airflow, and expensive repairs.
In this photo you can clearly see severe corrosion and deterioration on the evaporator coil caused by long-term chemical exposure. The coil fins are literally breaking apart.
✅ Better options for maintaining your drain line:
• Simple Green + hot water
• Distilled vinegar + hot water
• HVAC-approved drain cleaners
At COSMIC COOLING, our preferred method is:
Simple Green followed by a hot water flush — effective without damaging the system.
🚫 Avoid:
• Bleach
• Harsh drain chemicals
• Foaming cleaners not approved for HVAC systems
Need your system checked before summer hits?
COSMIC COOLING
📞 850-865-9420
📧 [email protected]
🌐 cosmiccoolingllc.com
License # CAC1824264
