Air Conditioning Duct Work

[Guest guest]

Hello everyone. Again, can you PLEASE help me.

I had an air conditioning contractor try to convince me that I should use metal

duct work

through out my house. The way he described it the metal had no insulation, but

was

wrapped with " bubble wrap " , then wrapped with foil. Yes, the same bubble wrap

used in

packing.

My common sense is that this is only an invitation for moisture from the cold

metal and I

cannot imagine Bubble wrap being insulation for anything. Seems like it would

be an

invitation for MOLD.

Other contractors are proposing using flex duct, which I understand has

fiberglass insulation

then coated with plastic in the center which will make a clean air compartment.

Any thoughts, or remarks? All would be appreciated.