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Are you closing blinds to keep sun out?
Oh yeah, all blinds closed but the sash windows open behind them... and then fans on.
The day starts well, ambient temp right now is only 22'c indoors - but that's roughly what it is outside too (measures 23'c currently)... so really the problem is that I can't keep the indoor different from the outside temp on hot days. I can create a bit of comfort from the shade and moving air... but when it gets to 28'c outside it's probably 26'c inside... 32'c outside and probably 29-30'c inside.
This is the problem with lots of windows and skylights... way too much external heat comes in to this space.
My little office gets warm really quickly too - which is great in the Winter, not so much in the Summer.
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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...
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31 in my flat right now, I feel you.
Get one of the AC things, just get it from somewhere you can return. I had a beko one, looks at the reviews of whatever you get.
The issues is we stopped building buildings to manage heat. My parents live in a 200 year old building and even with high temps it's always cool.
I had something similar in Spain. It worked good but was incredibly loud. I gave it away as I adjusted to the heat and that was just easier. Hugo captured it well.
Are you closing blinds to keep sun out?