+1 for this comment. I use a 0 degree UQ year round and I've forgotten to "vent" more than once and not had a problem. It's your TQ and whatever base layers you're wearing (or not) in the hammock that have more to do with how uncomfortably warm you'll feel.
The converse is not true - a UQ that is not rated warm enough for colder temperatures will make you feel uncomfortable indeed.
YMMV of course, but I've not found any real need to switch out the bottom insulation, TBH.
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