Sorry to hear it's not warm enough. Keep us posted.
I would certainly leave it laid out uncompressed in a warm room for a day or two to be quite sure it's completely dry and fully lofted. I'd agree it would be worth weighing it to check it is the right model.
Could be that the bag is fine and you are a cold sleeper. If so, the Nanok -10 could still be a good choice as you can put it inside the Nanok 0 for winter and use either one alone for the warmer months.
I would certainly leave it laid out uncompressed in a warm room for a day or two to be quite sure it's completely dry and fully lofted. I'd agree it would be worth weighing it to check it is the right model.
Could be that the bag is fine and you are a cold sleeper. If so, the Nanok -10 could still be a good choice as you can put it inside the Nanok 0 for winter and use either one alone for the warmer months.