Me too. But have you been in a competently built insulated and unvented attic? The insulation on top makes an enormous difference, to the point that the attic can usually maintain a very pleasant temperature.

While it’s true that the top side of above-attic insulation will be rather warmer than a vented attic on a hot sunny day, insulation on top of your attic also tends to work rather better than ceiling insulation. And there are plenty of other benefits to an unvented, insulated attic.

Interesting! But having a sealed attic makes me concerned about mildew. Ventilation is needed to keep the moisture out.