Is 3.8 cu sufficient to clean and handle a li g size comforter or do I need a a larger machine?

Hi - Yes, any size comforter will wash properly in our washers as long as it fits below the balance ring of the washer tub and is not stuffed in the tub tightly. Also, check out our GE® 4.2 DOE cu. ft. Capacity Washer GTW460ASJWW with DEEP FILL option- Customize your water-fill levels with just the touch of a button. Add a little extra or fill the tub to wash the way you want. Play Video: https://www.youtube.com/embed/CpfTCH8O-Ac?rel=0 - Thanks for choosing GE. We're glad to have you in the GE Appliances Family! SUE@GEA