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This simple decision tree can help homeowners and contractors make decisions about wall and window upgrades when re-siding a home

This simple decision tree can help homeowners and contractors make decisions about wall and window upgrades when re-siding a home
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This thermal image of an interior storm window shows how much temperature change occurs between the interior storm window panel on the right, at 50F and the existing glass on left at approximately 0F

This thermal image of an interior storm window shows how much temperature change occurs between the interior storm window panel on the right, at 50F and the existing glass on left at approximately 0F
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To get an average whole-wall R value of R-19 with double-pane windows, you’d need R-330 of wall insulation; triple-pane windows can achieve an R-19 total wall R Value with R-38 of insulation

To get an average whole-wall R value of R-19 with double-pane windows, you’d need R-330 of wall insulation; triple-pane windows can achieve an R-19 total wall R Value with R-38 of insulation
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Traditional and advanced framing of windows and doors

Traditional and advanced framing of windows and doors
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Triple-pane windows are highly insulating (U=0.18) to slow heat transfer while letting in plenty of sunlight.

Triple-pane windows are highly insulating (U=0.18) to slow heat transfer while letting in plenty of sunlight.
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Triple-Pane windows can be used as a tradeoff for continuous wall insulation or stricter air sealing targets when showing compliance with the 2021 IECC using the UA path

Triple-Pane windows can be used as a tradeoff for continuous wall insulation or stricter air sealing targets when showing compliance with the 2021 IECC using the UA path
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Triple-pane windows use three panes of glass separated by gaps filled with krypton or argon gas, insulated spacers, and low-emissivity coatings to achieve high insulation performance

Triple-pane windows use three panes of glass separated by gaps filled with krypton or argon gas, insulated spacers, and low-emissivity coatings to achieve high insulation performance
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Types of window attachments include exterior attachments such as storm windows, fixed awnings, dynamic awnings, roller shutters, roller shades, and solar screens, and interior attachments such as drapes, louvered blinds, roller shades, surface applied fil

Types of window attachments include exterior attachments such as storm windows, fixed awnings, dynamic awnings, roller shutters, roller shades, and solar screens, and interior attachments such as drapes, louvered blinds, roller shades, surface applied films, cellular shades, and window quilts.
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Ultra-efficient, R-9, triple-pane windows have insulated wood frames, argon gas between the panes, and low-emissivity coatings to slow heat transfer.

Ultra-efficient, R-9, triple-pane windows have insulated wood frames, argon gas between the panes, and low-emissivity coatings to slow heat transfer.
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Version 3.0: Exhibit 1 ENERGY STAR Reference Design Home - Windows (Revision 9)

Version 3.0: Exhibit 1 ENERGY STAR Reference Design Home - Windows (Revision 9)
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Version 3.1: Exhibit 1 ENERGY STAR Reference Design Home - Windows (Revision 9)

Version 3.1: Exhibit 1 ENERGY STAR Reference Design Home - Windows (Revision 9)
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Vertical side-shading, such as these side fins, can provide effective summertime shading for north-facing windows, but are generally not recommended for other orientations due to their marginal performance and restricted views

Vertical side-shading, such as these side fins, can provide effective summertime shading for north-facing windows, but are generally not recommended for other orientations due to their marginal performance and restricted views as compared to horizontal shading devices.
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View-preserving interior solar screens such as these help reduce glare and solar heat gain while maintaining view to the outside

View-preserving interior solar screens such as these help reduce glare and solar heat gain while maintaining view to the outside
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Vinyl frame window

Vinyl frame window
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Wall controls operate the windows and fans allowing homeowners to capture prevailing breezes.

Wall controls operate the windows and fans allowing homeowners to capture prevailing breezes.
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Wallingford Passive House | Exterior Insulation Window Detail

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Water Moisture Issues: Flashing Windows, Water Leaks, and Kick-Out Flashings

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Water stains on the framing indicate water infiltration at the skylight

Water stains on the framing indicate water infiltration at the skylight
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Weatherstrip installation on a door.

Weatherstrip installation on a door.
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While windows typically make up only 7% of the total envelope area of a home, they are responsible for 48% of its heat loss

While windows typically make up only 7% of the total envelope area of a home, they are responsible for 48% of its heat loss.
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Window and door openings fully flashed

Window and door openings fully flashed
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Window and Door Rough Openings

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Window attachments like insulated blinds, solar screens, and low-e storm windows provide many benefits including heating and cooling savings at a low first cost

Window attachments like insulated blinds, solar screens, and low-e storm windows provide many benefits including heating and cooling savings at a low first cost
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Window coverings like insulated blinds, cellular shades, sun-blocking roller shades, and low-e storm windows can provide heating and cooling energy savings

Window coverings like insulated blinds, cellular shades, sun-blocking roller shades, and low-e storm windows can provide heating and cooling energy savings