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The house I designed and built (with a lot of help) in Catalonia was excellent when it got hot. It would have done even better if I had after miscalculating the thermal gain through the windows, I had put shutters up on the outside. It needed to get to about 38C outside before it became uncomfortable inside. It's part of why the chickens liked it.I agree. The advice we're getting from the met office is to open windows now (early morning) to get (relatively) cool air into the house, then shut them and draw the curtains, keep them closed and stay inside. They say it will keep the house relatively cool.
The ancient Romans who could afford villas had it all worked out, not just orienting the house to maximize solar gain in winter and catching cool breezes in summer, they even had a form of air conditioning via aqueduct-supplied running water for the very rich. The simple and widespread version was the open topped atrium with inward sloping roofs and splash pond in the centre (impluvium) https://en.wikipedia.org/wiki/Impluvium which cooled everything when the afternoon thunderstorms arrived, and supplied some of the house's water too.