Yes. This will prevent heat loss and condensation.
Yes heat rises and if your attic is not insulated it will escape out of the roof.
The duct work probably runs through an area that is hot and humid, i.e. attic space, and it isn't insulated.
Yes. Skylights on roofs typically have a light well that extends through the attic. This light well should be insulated to prevent heat loss into the attic. The air/vapor barrier should be on the warm side, which is the side closest to the interior finish. The light wells can be thought of as conventional walls, exposed to the attic. These are similar to knee walls.
To ensure proper insulation for your attic access, you can use weatherstripping around the opening, install an insulated attic access door, and add additional insulation around the access area. This will help prevent heat loss and maintain energy efficiency in your home.
have put insulation in attic and now attic now sweats must i pull all this is in a cape cod style home and insulated between joists before enclosing. must i pull all to stop sweat
never
If your attic doesn't have any leaks, then the patina (green color) is most likely formed by the reaction between the copper and carbon dioxide in the air, forming copper carbonate. This patina, called verdigris, protects the copper underneath from corrosion.
There are some strange noises coming from the attic.
The need for an attic fan depends on your specific home and climate. Attic fans can help reduce heat buildup in the attic, which can lower cooling costs. However, they may not be necessary in well-insulated homes or in cooler climates. Consider consulting with a professional to determine if an attic fan is right for your home.
The inexplicable noises coming from the attic are the most baffling mystery to me.
The noise shows that your attic is not well insulated. You need to get extra covering so the wind can not whistle through the gaps and make noises.
The answer is that "it depends". If the attic isn't insulated, put it in the basement to save on heating/colling costs. If your basement has a tendency to get damp, put it in the attic or you'll risk blowing mold and mildew around in a few years. Whatever area you put it in, make sure the ducts are well insulated.