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Efficient Windows Collaborative

Windows for New Construction

Window Selection Tool

Use the Window Selection Tool for new construction to compare performance of 20 different window types in your location. The Window Selection Tool will take you through a series of design conditions pertaining to your design and location. It is a step-by-step decision-making tool to help determine the most energy efficient window for your house.

Window Selection Tool

Window Selection Process

This section provides step-by-step guidance on the window selection process for new construction windows including issues of code, energy, durability, and installation.


Design Guidance

This section provides Design Guides that examine the energy use impacts of new windows for homes in hot, mixed and cold climates. They show the the impact of orientation, window area, and shading. The energy use has been calculated for various window design variations including 5 orientations (equal, north, east, south, and west), 3 glazing areas, 20 glazing types, and 5 shading conditions.


Window Installation

This section is to provide guidance to ensure that proper installation is necessary for optimal window performance, to ensure an airtight fit and avoid water leakage.


Proper Installation



New Construction Windows

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Replacement Windows

Understanding Windows

Resources & Information

EWC Information