was looking for cooling solutions for my home. i got a bit of engineering backgnd.
heat travels from hot to cooler place.

coolbatts is insulation right?
so it means it will prevent heat from coming in so the house is cooler.
but at the same time, heat will also enter by the walls and windows.

at night, coolbatts will block heat from going out. so hse is hotter.

But if got vent hole won't there be lizards, pest etc? And surely it needs to be large in order to release heat. Like exhaust.
And during day, heat will seep in and make the living area hot.