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Thanks to all who replied. It looks like Trane/AS are the hands down choices. I will ask installer about those two and refrain from coatings. Else go the sacrificial route.

BTW Dash, I was not...

I need to replace my HVAC unit in my beach house (Bolivar Peninsula near Galveston TX). The house is around 900 sf. I was told that the type of coils is a factor to consider, related to corrosion....