Device R..-value Single pane window 0.9 Single pane with storm windovv 2.0 Douhle insulating glass, 14 in. air space 1.7 Double insulating with film and lmv E 4.0 Solid core door 1 1/4 in. 3.0
2.5 R..values for assembliesDevice R..-valueSingle pane window 0.9Single pane with storm windovv 2.0Douhle insulating glass, 14 in. air space 1.7Double insulating with film and lmv E 4.0Solid core door 1 1/4 in. 3.0