I grew up in a house that was cavity brick but with a bigger cavity than normal. My parents insulated the ceiling. Our house was 10 degrees cooler than neighbours places in summer and warmer in winter. Add in verandahs and it is such a good option for our climate.My old cavity-brick house copes fairly well on days like these, but like you I’ve got the blinds closed and fans spinning. Don’t have aircon yet but I’m hoping to change that soon. It’s oppressive outside so I’m camped out in my loungeroom where it hasn’t gone above about 26 degrees all day.
Outside the wind is hot and dry, and has to be up around 37-38 degrees.