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  • What size wire for a 4.5 ton unit?? - Self Help Forums
    … you'd have about a 5 horse compressor plus about a 1/3 or 1/2 horse condenser fan motor. I have 9' ceilings upstairs, 8' down, R21 walls upstairs, R26 down, and plan on somewhere between R31-38 in the attic .
  • Ozone Reductions Using Residential Building Envelopes
    Fortunately this coupling of the attic ventilation  model and the heat transfer model is weak because attic ventilation rates are not a strong  function of  attic  air temperature. In addition to the ventilation systems outlined in Section 3, the house had a bathroom exhaust that  operated from 7:30 to 8:00 a.m. (two 50 cfm  fans )  and a kitchen exhaust that operated from 5:00  p.m.  to 6:00 p.m.  … R26 .1 .