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Cheapest thing you can do is install some of this.
Have ordered some of this. The specs look great, 38% reduction in the increase of heat due to sun, total rejection of UV, 70% of visible light still gets through (even for a single pane of glass that is only 86%, so this is "visible but minor reduction in light" which is great as it will prevent glare).
Velocio-
Great.
Main tip is to make sure you follow the right mix of washing up liquid to water when installing. Too little and you can't place it properly; too much and it moves around and will shift when you're trimming it. Don't be afraid of getting plenty of mixture on the back and the front when putting into place.
I found it easiest to trim with a modelling knife and a credit card as the guide.
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I think your plants won't like this if you have any
Soul
frankenbike
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...