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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?


  • SuperJ
    SuperJ Member Posts: 605
    Some condensing units (like Trane) are basically fully shrouded. I suppose a motivated home owner/contractor could get the sheet metal shroud (not the fins) painted/powder coated whatever color they want without affecting performance.
  • GBart
    GBart Member Posts: 746
    DO NOT EVER PAINT THE COILS OR FINS!!!!!!!!!!!!!! EVER!!!!!!!!!!!!!

    Had that done at a commercial customer, the unit ended up with high head., and it was not repairable.

    You can take the jacket off carefully and paint that separately if you want.
  • the_donut
    the_donut Member Posts: 374
    I am just wondering out f the box, why some are painted black, or anodized instead of terra cota. Other than aesthetics.
  • GBart
    GBart Member Posts: 746
    Depends on the manufacturer and some have an option for a factory coating to protect against salt corrosion if it will be near the shore.

    Most are plain copper tubing wrapped in aluminum fins.