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Some tips i received from the guru at the RV repair shop near my house:
...keep basement doors latched tight
there is air exchange between basement and living space. if doors are open or ajar cold air 'seeps' downward and out....
minimize vent fan usage, stove, fantastic vent and bathroom vent fan
if your roof is black/moldy, apply acrylic latex coating by Heng's or Dicor
Make sure evaporator is clean with clean filter
If delta temp across evaporator is higher than ~20º, you may need to have the unit 'serviced'
make sure condenser is clean
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