"Stormin Mormon" wrote in message

Heat going into the large line doesn't "add to the cooling", it
actually detracts from it. Yes, heat going into the large line
does reduce the efficiency.

Beg to differ, even if I'm asking a silly quiestion about the foam. Any
heat "going into the pipe" _from inside the house_, is extracted from the
house. In that way, it adds to cooling. It may be cooling your basement
and the living room, which is not what you want. But it's not a total
waste.

Agree that heat going into the same pipe on the outside, reduces efficiency.
Even if it's a fraction of a perent.

You've got a bit to learn.

I'm sure I do. We all do :-)

Regards,

RichK