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 Thermostats should never be set below 70 deg F.
Fan selector switch should be set to "on" in summer and "auto" in winter.
Filters should be changed monthly to assure proper air flow and to keep evaporators clean.
Belts should be changed at least once per year and adjusted as needed during the year.
Drain pans and lines should be cleaned thoroughly once per year and drain pan pills used quarterly.
Outside condensers should be washed and/or chemically cleaned every year to remove debris and pollen buildup.
Water source units need to have the strainers cleaned monthly.
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