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hippy
Cheapest thing you can do is install some of this.
That reduced the temp in our house by about 2 degrees on really hot days. It also reduces UV damage to furniture / flooring etc.
Having said that, we now have 7 AC units and two heat pumps installed to manage temps in our house. Super insulated / air tight new builds are impossible to heat manage properly. It was 29 degrees in my office this morning, before 8am.
Now sitting in a lovely 20 degrees, using around 0.2 kWh
Worth noting that heat pumps, AC cassettes and installation are currently all VAT free...