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Originally Posted by retiredguy123
If they are servicing your system, why did it rust? Sun Kool's 21 point HVAC tune-up says that they will apply a foam spray to the inside unit coils and wash and "wax" the outside unit. I have never heard of waxing an air conditioner. Is it possible that their foam spray caused the rust? They also say that they will "visually" inspect for refrigerant leaks. I don't think you can actually see a small refrigerant leak. The 21 point tune-up says nothing about inspecting or proactively replacing the capacitor, which is the most vulnerable part in your system. But, I have not found any company's HVAC service tune-up that includes proactively replacing the capacitor as part of a regular maintenance service.
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Sun Kool proactively replaced our capacitor during a semi-annual check up. Last year, when we checked on our filter, we found it soaking wet. We called Sun Kool and they replaced the very rusted out coil, free of charge.