Years ago, Tide came out with a new laundry soap called, "Tide: Cold Water." When I saw these commercials, I asked myself if it was really necessary to use a special soap to wash in cold water. The answer is NO.
In addition to using enough laundry soap for a "small" load, I also wash my clothing in cold water. This will help with the heating bill of my water heater. You don't need a special soap to use the cold setting for your laundry.
The one thing I still use hot or warm water for is my bed linens and towels (which I wash together).