hot air

I live in a 1960's house, that is constantly way too hot throughout the summer - I know that this is expected during the warmer months, but it's way hotter than it should be (upstairs is ~29 degrees in the evening). I've tried various advice I've found online such as keeping blinds down, whilst...

Saw this in a utility/electrical cupboard of a large stately house that I was at earlier for New Years celebrations. Inverter for the blower on the hot air heating system that the property has perhaps? It was mounted high up in the corner, and the room it was in was also near a large air...