Have you tried to sleep in the hammy yet? Some just can't get the hang of it at all and give up. Some take a few times before they're comfortable enough to sleep. Some take to it instantly.
My first Winter hang was in my backyard at ~ 28*F (-2.2*C). I used a walmart pad and fleece blanket while wearing long johns and tshirt, long sweats, 2 pair socks, beanie hat. My cheap rectangle Walmart bag (rated 50-60*F) was around the rig like a peapod from the foot end up with my jacket on head end to close it all up.
The pad was a little hard to stay on at first, but, it finally worked. Woke up sometime around 3 for bathroom and the bag was frozen and frosted on the outside, but warm enough inside. I did get cold feet and that was all, but, not cold enough to keep me awake.
I also recommend starting in backyard or close to a bailout option if possible. If your experienced in cold camping in tent, take it if going in woods in case your not comfy enough the first night in the hammy. Definitely go with friends, they can help you dial in your rig while your in it.
Take pics of your hang for us.
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