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Shitty digital door(ule)
(orcas.enjoying.yachts)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
You can make insulated glass doors fairly easily. Just sandwich a gas between layers of glass. Look at any modern window for an example.
Still not as insulating as a thick door with the manufacturer's choice of insulation material. Double/triple pane glass is far better than a single pane window but a window is still a window