For me, most quilts work at or a little below their "advertised" ratings, but if it's 15°F I'll switch over to the 0°F UQ.
When it's that cold I'll also be carrying down parka and pants, so I use those to augment my 20°F-rated TQ and can easily get down to 0°F using that combo.
But it won't go down to -15°F... tried that once while ground (snow, actually) sleeping and it got a bit nippy at times although I did manage some sleep. I now have a 0°F-rated TQ for that reason. Below zero I just go-to-ground if I'm backpacking. I usually like to cover some distance and seriously below zero hammock kit becomes quite heavy and bulky, the realm of pulkers.
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