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refrigerant freon

  1. HVAC
    I just noticed that a 24kcool/75kheat unit from 1990 has a factory charge of 40 oz where as an adjacent 2007 unit with 24k/60k capacity has a factory charge of 70oz. They're both running R-22. They're both Ruud units. Why does the newer design use almost twice as much refrigerant? Is it a...
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