Curtains do not limit the greenhouse effect that occurs when light passes through glass or another refracting surface. They help but with passive solar it is normally better to shade a window from the outside in summer and remove the shade in the winter.
You can do this with awnings (quick solution) or plant a deciduous shade tree on in the path of the sun where you want summer shade (long-term solution).
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89 M3T BMWCCA Club Racer
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95 M3 Daily Driver
95 M3 Prepped racing shell
98 M3 I-Sport race car in development
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