Jeff it does seem like magic. You are correct any air leaks and that warm air will go away and not come back.
I have eight 55 gallon barrels on water and about 1,000 gallons of fish water. The black barrels heat up during the day and release heat at night.
The back walls and the roof are insulated with 4.5” Dow blue board foam insulation. That makes 22.5 R all OSB is covered with Grace Ice and water to prevent any air getting into the building.
This is better insulation and air sealed than my house.
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Current project Aquaponics system , Passive Solar Greenhouse build
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