I sleep on a 10 inch thick memory foam mattress at home which has way
more insulation than any winter underquilt and it's not that uncomfortable
in the summer.

With that in mind, would using my winter Lynx UQ on my RR this summer
be just too hot for comfort? I will try someway to vent it.

Obviously, I should just get a summer Lynx but I can't afford it right now.

Has anyone experienced a winter UQ in the summer?