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Terra-cotta colored condensors
I assume black paint on coil fins is for better heat transfer (a little bit of coil cleaner will eat the paint, so I doubt it is for corrosion control). I know it’s only a 4% increase on the radiation side (I assume convection is dominant heat transfer mode). Besides being more visible, and possibly clashing with scenery, why not have terra-cotta colored fins on condensor coils? Has it ever been done?