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What did you use please @Velocio and would you recommend it?
Prestige 70 Ultra Solar Control Window Film
from https://www.abodewindowfilms.co.uk/Do absolutely follow the installation guide, and order a bit more than you need to screw up the first one (you will... not wet enough, too many microbubbles as it wasn't clean enough).
Does it work? Yes.
Not a miracle solution, but it is definitely cooler and feels less aggressively hot with it even though the sensors I have only show a few degrees lower.
What did you use please @Velocio and would you recommend it?
Our loft bedroom hit 32 during the last heatwave and the big problem seems to be solar gain.
Our skylights have built in blackout blinds but they're not enough!