Im a pretty warm sleeper, i camp year round and have a winter bag, i plan on using this for spring summer only and it can get plenty hot in southern idaho even in the mountains, i tried last year just using my liner bag from my winter unit and it was way to warm, it by its self is rated to i believe 25f so i figured the 55f would work for what im using it for.
EDIT: Also im a weirdo and can only sleep while wearing pants when im camping, i dont know why