I did a short hammock overnight last night in a big state park here in central GA. The temp dropped to about 34F with a slight breeze and clear skies. I've been fiddling with this setup for a while, trying to find a dirt-cheap hammock setup that's still comfortable and fairly light, but also modular. For me, part of the fun of backpacking is rigging up DIY systems like this
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-Hammock: Yukon Outfitters (woot $24 special) bugnet hammock + JRB tri-glide straps + alum carabiners. Maybe $50 here.
-Outer insulation: Wind block / under-belly made from a Dri-ducks poncho. $9 + shock cord.
-Inside insulation: 25" wide green foam pad from a big box store (don't remember which) on top of a cut-down mylar-coated windshield cover from Walmart. $12 + $3.
-Bag: Vaude Cheyenne 500 (~25F down bag). $100 (on sale)
-No tarp, because the night was clear. Otherwise it would be an ENO Profly - $80.
I'm not counting the ENO gear sling, because it's basically useless - I only bought it to hold my rifle when hunting.
I slept in my Kuhl hiking pants, wool socks, a light REI synthetic base layer top, and a light fleece beanie. I woke up hot after a couple hours and had to open the bag, but I slept comfortably the rest of the night.
I can sleep on my back or side, and even get a bit diagonal. The foam pad clings to the bag and the mylar layer, and the mylar slides on the hammock - i.e. everything stays with you as you move, no fighting to stay on the pads. No condensation issues.
I'm too lazy to get all the weights off the spreadsheet on my work PC, but I think the whole setup (tarp included) is around 6.5lbs. With the tarp on and snugged down (and maybe with a down shirt on), I think it would be good down to around 25F.