What is up with your house that it needs all of that?
Yeah it's bonkers isn't it. Doesn't sound right. I'm guess once it heats up and the air inside it heats up, that air cannot escape. I suspect this is how it is designed to behave to keep it efficient in the winter though.
But why is it getting so hot internally? You'll have some solar gain but that can be addressed with thermal blinds, fridge/computer/ humans putting out some heat but where is the rest of it coming from?
Yeah it's bonkers isn't it. Doesn't sound right. I'm guess once it heats up and the air inside it heats up, that air cannot escape. I suspect this is how it is designed to behave to keep it efficient in the winter though.