@TechConnectify We used to deal with this problem by having twelve foot ceilings and double hung windows and leaky construction with no A/C. Now that we are striving towards efficiency, the attic is the problem, and there’s a good history of home construction to show that attic insulation alone isn’t the solution.
I understand you also have hot days. I’m not talking about hot days. I’m talking about the fact that the lows do not drop below desired temps for months on end.