I researched replacement windows of various manufacturers and materials prior to selecting Milgards Thermal Break Alumimun Frame Window. After seeing a Milgard sample window and cut through a frame member my lifetime of experience in the design and construction field convinced me this was an excellent product and my choice for my 30 year old home. - Rowlett, TX

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Key benefits

Narrow Sight Lines to Inspire Design Freedom
Improved Energy Efficiency
Full Lifetime Warranty

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Select the available operating style icons above to access product specifications and design files.



Series Specifications (.doc)
Series Specifications (.rtf)


Series Performance Ratings
Series Performance Ratings - Skylights
Series STC Ratings


Full Architectural Manual
Operational Style Arch Manuals available by clicking on icons above.

Series Architectural Manual - Glass and Glazing




Energy Efficient Technology

The use of thermal barriers in aluminum framed windows vastly improves insulating ability. A thermal barrier is an element placed within the frame to reduce the flow to heat. Milgard Thermally Improved Aluminum windows are equipped with this thermal break and as a result, are more energy efficient.

Thermally Improved Skylights

Brighten up dark rooms with a skylight. Add daylight into your projects without compromising wall space and privacy. At night, you can enjoy a view of the stars and catch moonlight. Milgard thermally improved aluminum frame skylights are a quality alternative to plastic skylights for reliable long-life performance.

Energy Calculator

The Milgard Energy Calculator provides a quick and easy way to help you select windows and doors that can meet local energy codes and project requirements. This tool gives you the flexibility to select the required ENERGY STAR® zone, u-factor, SHGC or VT, and determine which Milgard window and door products meet the selected requirements. Additional selections can also be made based on product series, operating style, glass type, grids and spacer type.

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Milgard Aluminum Frame Colors

Milgard aluminum windows come in four beautiful frame colors to coordinate with your home design. Choose a clean, white finish or opt for a darker frame to emphasize the window shape.

Customer Reviews for Thermally Improved Aluminum