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Certain models of Carrier condensers have plastic sound blankets over the compressor to deaden the sound from the compressor. You may be looking at the sound blanket over the compressor.

http://ducts.lbl.gov/ http://www.southface.org/web/resources&services/publications/technical_bulletins/DIS-Air-sys-install%2003-0783.pdf

It depends upon a lot of factors. What was the sheathing material? Where is the home located, that is, what is the climate like? Rain? Snow? Arid? What is the siding material? Can you see any of the sheathing from the inside? If the sheathing was completely dry before the vapor wrap was...

Here is a site which will answer your questions about PEX: http://www.ppfahome.org/pex/faqpex.html