In a hammock down to 25F the JRB Hudson River will do the job. You'll be carrying about 20 oz of quilt and very comfortable, especially if you are a warm sleeper. I'm a cold sleeper and it does very well for me. Only had a feeling of being less warm at 25F, not actually cold. I have a second one as an underquilt.
"In the beginner's mind there are many possibilities. In the expert's mind there are few." Shunryu Suzuki