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Windows
- Spend as much as you can
- Get triple-pane windows and fiberglass frames
- Look for Energy Star certification
- Add a metallic film that is applied as a coating to the window. North, south, east/west walls will each have different requirements for the coating
- Northern facing windows will always be a net loss, high quality southern facing windows can be a net gain
Doors
- Get a door with a foam core and a foam or neoprene seal
- Look for Energy Star certification
Cost: $20,000 - $30,000
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