Here is something I built for a client after I saw an advertisement for the sauna enclosure.
Essentially they both serve the same purpose, which is to isolate the interior from an exterior of greatly different temp.
In the bed chamber unseen near the top inside is a smallish electric fan heater that is very quiet and controlled by
a thermostat that can easily keep the interior a toasty 75 degrees when the outside is in the 40s or 50s. probably much
colder in fact but then you have to worry about freezing water pipes. If I lived in alaska etc, I think something like
this could be done for office workspace as well as sleep space. This unit I built is so far only uses small heater
but I suggest one of the new small portable AC units that could blow cold air in extremely hot tropical climates etc.
for summer use.
I have to add, that when the sliding doors close, I fear there is a limit of breathable oxygen so that is why at
the top on the other side is a vent and also a fresh air intake vent tube near the top left corner of the mattress down low.
My plan was for there to exist a very slight convection air flow to prevent hypoxia or worse. Also there is a flat panel
TV over the foot of the bed up near the very top on the inside.
I hope this was the most appropriate forum... if not just let me know.
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