Yup our house has those on the E W and S sides. They will get covered up when I get around to putting in more soffit vents.
I like cellulose insulation but it is extremely dusty. Also the other thing to think about is that it's treated with borates which kill bugs and acts as the fire retardant. Wouldn't want that in my clothes. Though some sort of heat exchanger could be done. Use a metal pipe to duct the air through in the attic. It will absorb quite a bit of heat.
Have run copper hvac line in many houses in the summer and it will get hot enough to burn skin in minutes of being in the attic here.
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