Q: like this http://www.mb-soft.com/solar/index.html what kind of glass does it use???
A: The reference given contains factually incorrect information. A greenhouse can work in a cold climate, but more than 1.5 hr of sunshine is needed. A better reference is http://www.gov.mb.ca/agriculture/research/ardi/projects/04-534.html Hint: look up the mean solar radiance at your location and calculate the energy flux through a surface of your house at ?? angle to the sun (varies by season and time of day). Add any supplemental heating to this number. Next calculate the heat loss by convection, conduction and radiation. These will depend on the temperature gradient between your walls and the environment. Your house will have a temperature at which the incoming and outgoing energy fluxes balance.
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