Hybrid System:
Thermal Mass, insulation, and insulating curtains for overnight use
Thermal mass: metal oil drum filled with water
approx 300 gallons of water according to:
http://www.greenhousegarden.com/Material%20properties.htm#Suggested%20Gallons%20of%20Water%20(thermal-mass)%20to%20Assist%20with%20Solar%20Heating%20of%20Greenhouses
To cover the north facing wall, would need approx 100 sqft of material
possible material: "Reflectix" found at Home Depot (approx. $60)
Night curtain: mylar material- still need to figure out a working design
**need a self sustaining (solar?) fan
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