modern Scandinavian homes have huge uncovered well insulated windows to allow the sun in as a free radiator during winter
Which of course is why you pull down the blinds to limit heating of surfaces inside during the day and let the insulation keep heat out.
Due to the high insulation this doesn’t dissipate during the night in a heatwave, so it doesn’t matter if the outside temp is 18°
Which is why you of course open windows during the night to cool things off when temps are lower.
it’s not perfect, and helps less with high nighttime temps, but it makes the proper insulated home work with you and not against you as much as possible.
You need the blinds on the outside of the window, otherwise this helps minimally, especially if the whole southwest facing wall is glass, which turns the apartment into a greenhouse.
During the heatwave, night was the only time I could cool the room with portable AC, provided all windows were closed to not let heat in.
We have a massive south facing side filled with windows (and two double glass doors), covers about 80% of the living area, all blinds mounted inside. We still had 9°C lower temps inside compared to outside during the worst hours of the heat wave. Yes 28°C is still hot, but much better than the 37°C we had outside.
Which of course is why you pull down the blinds to limit heating of surfaces inside during the day and let the insulation keep heat out.
Which is why you of course open windows during the night to cool things off when temps are lower.
it’s not perfect, and helps less with high nighttime temps, but it makes the proper insulated home work with you and not against you as much as possible.
You need the blinds on the outside of the window, otherwise this helps minimally, especially if the whole southwest facing wall is glass, which turns the apartment into a greenhouse.
During the heatwave, night was the only time I could cool the room with portable AC, provided all windows were closed to not let heat in.
We have a massive south facing side filled with windows (and two double glass doors), covers about 80% of the living area, all blinds mounted inside. We still had 9°C lower temps inside compared to outside during the worst hours of the heat wave. Yes 28°C is still hot, but much better than the 37°C we had outside.