No, you can rest easy they are 99.999999% not defective. This is VERY common in the new homes. New homes are tighter and thus they need to have a more pro active mindset on monitoring humidity levels.
Whenever you cook on the stove, turn your range hood on. Whenever you take a shower, turn your bath fans on for awhile.
If you have blinds or shutters, keep them partially open pointing towards the ceiling. Make sure your windows are latched and not just closed.
Put your ceiling fans on the winter setting, blowing up. There is a small switch on your fan to make it either blow up or down. Blow Up in the winter, down in the summer.
In severe cases you may want to put some old towels along the sill so the condensation does not drip off of the sill and down the drywall and onto the floor. I have seen expensive flooring ruined from condensation.
It is just like having a glass of lemonaide on a hot day....the glass will sweat.
Windows, almost all windows are not all that energy efficient, and when the air outside is colder than the air inside, and the air inside is humid, windows will sweat.
I have a inexpensive humidity monitor in the middle of my home and constantly monitor the humidity both inside my home and outside my home. I try to keep the inside humidity around 50%.
As much as I like the fresh air inside the home, I always check the humidity levels first....just because it might be 3 degrees cooler outside than it is inside does not mean we want to open the windows to let the cooler air in to cool the house down. If the humidity outside is 93%, you are doing yourself no favors increasing the interior humidity, as your A/C will just work harder hours later when you turn it back on.
Sorry for the long post. Basically it is all about humidity levels.
Frank
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Florida licensed Home Inspector #HI688. (352) 250-7818
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