Can you set up in your backyard or garage your gear and do a test overnighter at the current temp? It might give you an idea of what's working, and at how cold. At worst if it gets too cold you can just go back inside the house and figure out what to try next time.
Here's what worked for me as a total newb, on my first overnighter. I used a CCF ridgerest pad with a -3c sleeping bag. I also wore thermal base layer, fleece, toque, and fleece socks over my liner socks. I also used the hot water bottle trick. I stayed nice and warm all night which I heard reached near freezing temp.
Since it's going to get much colder I've been looking at making a hammock sock. I read that this simple light layer of cloth which cocoons your entire hammock, pads, quilts and all, will add another 10 degrees. Doesn't cost much to sew one if you can access a sewing machine.
Also, you could add a $15 fleece sleeping bag liner to get another 10.
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