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The window covering does not increase any insulating R-value, but prevent indoor air movement. Condensation is the major problem.
DevenC 发表于 2013-12-26 12:49 - r& z/ X( O2 C2 }3 D$ W2 Ywhat happens if there is persistent condensation? , O5 o4 {& H2 J% F4 dblinds and curtains are left open all the time, t ...
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good question. it means your indoor humidity is too high. many reasons: cooking, air leakage, rh too high, or insulation problem around your windows.