In general, no, although many down comforters are made to be lighter-weight, in which case you might as well use a vegan alternative since you aren’t using the down for a hight amount of warmth anyway. There are heavier-weight vegan options as well (see above) which will be quite warm. It’s worth asking yourself if, just because it’s cold outside, if your bedroom is actually colder in the winter, justifying a heavy down comforter in the first place. Layering is also something to consider if you are avoiding down; a sheet, organic cotton blanket, and lyocell- kapok- or recycled polyester-filled comforter will be quite warm even in a cooler bedroom.