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The insulation I used for my observatory is called "AMETALIN", and the type is "Thermal Break 8.0" which states that it can produce an 8 Deg C difference between inside and outside - which it gets close to.
It has 2 outer layers of highly reflective foil sandwiching a tough foam - like layer about 6mm thick. Highly recommended but not cheap.
It certainly takes the "edge" off of the temperature so that a 34 Deg C day is translated to a 26 Deg C interior - not a cool room but pretty good.
Richard
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