Hello Dan,
It is not so much as a loss as it is a supper heat gain since the cooling
does not start till in the cooling section. Most I think have at least 1/2 to
5/8 inch foam on the suction or heat discharge line depending on in A/C mode
or heat with a heat pump.
There should be almost no loss what so ever in operation up to 35 feet at
least. Once you hit 50 feet you might have to change the line size larger or
smaller depending on upflow or down flow operation unless a variable speed
compressor is used.
Some units will only be offered with certain length line sets of tubing
and they are already set for proper operation.
...............bob
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