Wouldn't you just use a lighter blanket? I put my comforter away for the summer. More on reddit.com

If your room is too hot that's what you need to fix. No comforter actually has a cooling effect — they're all warmer than no comforter. A plain sheet will be warmer than no sheet. Where do you get the idea that there are cooling comforters? Maybe what you need is Bed Jet ? More on reddit.com

Do you have a mattress protector on your bed? Is it made of vinyl or shower curtain type material? If so, switch to a natural fiber one (we use the My Green Mattress organic cotton). A synthetic mattress protector will trap heat and make you hotter. We have a Woolino wool duvet insert with a linen duvet cover, organic cotton sheets, and a Faribault Mill wool blanket if we need an extra layer on cooler nights. Our bed is sooo comfy and cozy, not too hot or cold. Natural fibers are key! A set of cotton sheets and a wool blanket should be a good combo. Everyone thinks of wool as a cold/winter fabric but it’s good year round, a chameleon of sorts. More on reddit.com

You can use a duvet as a comforter and vice versa. Although, some need to be dry cleaned and that can be hassle. Do you want a comforter because of the style/colors? Fluffy + cooling + “comforter” is going to be difficult to find. Fluffy is hot. Lightweight/summer weight could potentially help. Coma inducer cooling comforters seem to have a lyocell shell and poly fill. This combo can be found in a few brands (Ikea and Buffy also sells this combo). The poly fill MIGHT run warm but some people find these to be cool enough for them. I think for what you want, that might be a good choice. There are also some duvets/comforters that are lyocell shell and fill, but they’re not fluffy at all. The next best thing is probably wool. It’s temperature regulating but not super fluffy. IKEA sells a wool duvet that is washable with no corner tabs. There are other brands that sell wool comforters & duvets. There are a few washable silk duvets & comforters, but they won’t have much style. Also, if money isn’t a huge factor, you can look into a bed jet or a chilipad. More on reddit.com