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Possibility the return air on the quiet cool system is collapsed like mine and others on here not letting enough air to return to the unit keeping good air flow through the unit to prevent it from freezing up. If you remove a return air grill and get a mirror and look inside the duct you never know what you will find besides a lot of saw dust and who know what else during the construction process, also probably saw dust inside of the a/c unit itself restricting air flow..
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