I have the skylight shade on my kitchen skylight from the factory but it still lets in a ton of heat and light as well. I would recommend either foam insulation or some sort of reflective barrier for the heat as stated above. A do it yourself is probably your best choice.
Saw a post a while back where a metallic lined car sunshade was cut to fit and had velcro added to hold it in place, was pretty slick and very practical in my opinion.
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