We have quite successfully kept the house a chilly 23 degrees C during this 34 degree outside heat.
We've managed this by buying and fitting blackout blinds and curtains.
Keeping all curtains, blinds and
Installing some plastic board covered in tin-foil on a single-pain skylight ( which made the stairs a greenhouse ).
We do currently have a 'portable' aircon but its unlikely that made a difference to anything but the box room its in. Its there to keep the chinchillas cool.
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