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Cheapest thing you can do is install some of this.
I have this for my garden office, which was getting warm even when it was frosty outside.
I'm also going to have an exterior canvas awning to stop the sun getting to the bifold in the first place.
NotThamesWater-
I have this for my garden office, which was getting warm even when it was frosty outside.
It's on every window in our house now. Takes maybe 4-6 degrees off in my kitchen with the larger door panes.
Still needed aircon to really control heat in our house. Thankfully it's super efficient at getting to temp and maintaining once there.
Soul
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...