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• 09:36, 30 September 2026 Gwaniehbsm talk contribs created page Copper Line Set Sizes Explained for Mini Split Systems 75249 (Created page with "<html><p> The vacuum wouldn’t hold.</p> <p> Not at 500 microns. Not at 900. Not after the third pull-down while the homeowner stood in the hallway asking why the new ductless system still wasn’t cooling. The strange part? The leak wasn’t at the flare. It was six feet away, hidden under split insulation, where a tiny rub-through had already cost <a href="https://speedy-wiki.win/index.php/The_Role_of_a_Line_Set_in_Refrigerant_Flow_41454">insulated line set</a> $286 i...")