I’ve had a quote for air on for the bedrooms which isn’t cheap (£13k) but is doable. The units would also give heat in the winter. We have solar panels so don’t needto worry about the cost of running the air con.
also considering shutters or brise soleil (mini pergola like things above the south facing windows)
I have thermal blinds on the biggest windows which stop some of the heat in the house.
Wondering about planting for shade closer to the house.