ODL. The maker’s Low-E glass packages qualify for federal tax credits and can be combined with internal, between-the-glass blinds, which provide a U-factor between, 0.23 and 0.26, depending on the door. Internal Muntin Doorglass Blinds offer both insulation and energy efficiency, the maker says, thanks to a 15/8-inch triple-pane assembly. For additional energy efficiency, the doorglass blinds can reduce solar heat gain by up to 77% and eliminate the need for dusting. 800.253.3900. www.odl.com.

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