Keeping Cool in a Heat Wave
We are currently in a heat wave. During heatwaves my velux heat up in the afternoon sun and radiate heat both into the apartment during the day but also at night after the sun has set. I have found that during a heat waves it is wise to close the blinds and close the windows as soon as it is hotter outside than inside.
When it is hotter outside than inside closing windows keeps the apartment slightly cooler, but not much cooler.