I went to a huge Home Depot looking for materials to make a DIY top for the glass enclosure like in this stickied thread and while wandering the aisles found something called Reflectix, it's like aluminum foil bubble wrap and used as insulation.
The terrarium has a grille along the length of the front glass panel, so my thinking is that fresh air comes in from the bottom, is warmed on the left side, rises in the tank and flows out the hole cut on the right side, creating a good circulation pattern.
In the summer I'll either cut the hole larger or possibly cut off and remove about 1/3 of the sheet.
Because Reflectix bubble wrap comes in a roll, I need something to hold it down flat at first so used the dinosaurs and have just left them there
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