What you see is condensation also known as ductwork sweating.
House roof shingles sweat in summer.
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High levels of humidity inside the home cause moisture to condense on the walls and sometimes the windows as well.
Roof condensation has a very specific cause.
This is sometimes common in older houses that do not have the proper vents or fans to eject excess moist air.
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The low e coating minimizes the heat transfer from inside so the outside glass surface can cool notably below the outside air temperatures.
In the summer of 2000 they studied this very issue.
Moisture occurs when heated air inside the home rises up to the roof where it meets the colder temperatures of outside air.
What s the truth about this claim.
On hot days you may notice water droplets forming on your visible air ducts and wonder whether this is normal.
Fortunately it s easy to find out because the florida solar energy center fsec has done the research.
With just the right mix of inside temperatures accompanied by outside temperature then adding the outside humidity the windows with low e shield can develop condensation.
It s no surprise that this tends to occur more in colder months when home heating is more common and intense.
Summer is the time of year when your air conditioning unit has to work the hardest to cool your home.
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The rapid cooling leads to immediate condensation.
When warm humid air from outside comes into contact with the cold concrete the air rapidly cools and condenses on the surface causing the wetness.
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For most floors condensation is the main reason for the sweating especially in warm weather.