[Garage, attic, basement, and crawlspace locations are a similar problem. Its a dew point issue. The dew point temperature of the air contacting the cool surface is above the surface temperature, condensation. Any insulation that does not have a perfect vapor barrier on the wet side of the insulation will allow condensation on the cool surface. Solutions: reduce the dew point of the air on the cool surface or warm the surface. Ventilation introduces more wet air. Ventilation is not a solution to this problem! If insulation with the vapor barrier on the warm side impossible, consider dehumidification. Basements and crawlspaces for sure because mold control is necessary in these spaces. Crwalspaces need plastic ground cover and closed vents. For tough attics, close vents and dehumidify.
Using a/c for humidity control requires the coldest coil possible for low load conditions. If supplemental dehumidification is used, warmer a/c coil temperatures are possible. Higher coil temperatures = warmer duct surfaces = less sweating = more btus per watt. Seems tobe a trade-off. [/B][/QUOTE]
Well said and very correct!
If all else fails....Try reading the directions!
Tell it like it is and let the chips fall where they may.
Any views or opinions stated here are strictly my own.