You mentioned pipes within the context of water. Copper pipe (tubing to be more exact) is used in air conditioning systems, the coils (heat exchangers) and the

You mentioned pipes within the context of water. Copper pipe (tubing to be more exact) is used in air conditioning systems, the coils (heat exchangers) and the tubes that connect the condensor and evaporator. There's also all of the copper used as windings in electrical motors, fans, compressors, transformers, etc. A "hidden" use of copper is brass which is an alloy made with high percentages of copper.