as long as you realise the claims are the maximum possible in clinical conditions
and a 5 to 10% saving in heat loss over the roof would equate to maybe 40% off the whole surface[assuming the roof is 40% off the glass area] so reduce to 2to 4% off say a 80% heat loss would bring it down to 77.5% heat loss
you need to do the calculations to see what you get
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