[boatsie]

I have 3 large skylights which cause the rooms they are in to get very warm in the evening when it’s sunny. I used the Gila window film that is designed to block heat and UV but allow light through. Though somewhat expensive at around $50/roll to cover 2 skylights, it works extremely well and I wish I had used the film when I first moved in. A huge difference in temperature though I don’t have the empirical numbers. The film is adhesive and requires you to do some acrobatics to apply upside down in a skylight but very doable with a helper. It should be removable with a hair dryer.