"Water lines should simply not be located in problem areas and if the floor is properly insulated how can the floor be a different temperature than the room temperature? This likely cannot be accomplished with fiberglass---but like I said…"
"The dew point temperature is so close, that it only takes a very few degrees of rise in duct temp that there is no chance of condensation. Add to that the fact the duct surface temp will always stay warmer than the air temp coming into it,…"
"Yes of course, I meant the indoor coil. Obviously the coil at 40 degrees is going to be well below the dew point sufficient to condense moisture out of the air where it can be drained away, so on that surface or very near it the humidity…"
"To reach dew point at 55 degrees F, the humidity in the duct after the condenser would have to be above 99%---I think that would be unusual. It is more likely warm moist air is finding its way into the cold duct and condensing."
"The air is only saturated because it is very cold. The amount of "actual moisture" in the air is very low. Any condensation that happens should be outside the ducts, not inside the ducts. That would be an inadequate…"
"We have lots of older (late 50's) systems in this area that work great. These have a return air grille into the crawl space in each room with an opening to the return air duct at the furnace plenum. This conditions the air in the…"
"A few thoughts. The IRC gives guidelines and requirements of sealed crawl spaces. I like the approach where the vapor barrier is heavy gauge PVC with welded seams. Be careful wrapping wood posts as this can direct moisture into the…"
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