Hello Sandy.
It is a good solution that the TT have come up with in the link I posted.
Having flexability in the design is key so you can add and remove shade and ventilation elements. One of my initial experiments in this kind of setup hit 47C air temperature in direct sunlight in March so needed some adaptation but the methods in the article are very sound.
I've "accidently" (couldnt find them in the autumn) hibernated tortoises outdoors in this kind of "giant coldframe" set up. Deep, deep substrate areas are needed so they can burrow and thermoregulate themselves.
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