How to keep your home cool in a heatwave this summer 

As El Niño threatens to turn up the heat, Jennifer Sheahan shares advice on keeping your space cool without spending a fortune

Jennifer Sheahan's large bedroom window faces southwest. Picture: Moya Nolan

The last week of May gave us a preview of what summer apparently has in store for us, and honestly, I wasn’t ready. 

My bedroom — in a dormer extension, south-west facing, well insulated but with a huge window — turns into a sauna as soon as temperatures head upwards of 22 degrees.