Which one will keep you warmer ???? if you like you can explain me the due reasons ?
It is unlikely that either combination will, of itself, conduct more or less heat across a given temperature differenceThe one difference would be how much free air circulation you would have between you and your first coveringThe more air circulation, the more you are likely to feel colderSo, depending on the fabric of the blanket and the duvet cover, I would expect that the duvet would do a better job at conforming to your body shape and reducing the air pockets between you and it, and so it would be better to have the duvet underneath.
It depends on the R-value,I priced R-19batts for the same size space,and it was approx $400US.This was just to add a 2nd layer,however,If you have no insulation,I would recommend R-30 or 38.A friend had insulation blown in by a contractor for the same size space at a cost of $1500US.You want to use unfaced batts in an attic.I misread your ?,I thought it was 1000 sqft.If your house is actually 10k sq ft,you can afford to have a contractor do it.
