| Energy Star is part of a government-backed program | | | | Keystone Industries |
| promoting energy efficiency. Windows are one area | | | | Kinro |
| where the program works. | | | | Kolbe & Kolbe Millwork Co., Inc. |
| Window Manufacturers Qualifying For Energy Star | | | | Lauren Windows |
| Ratings | | | | LbL Windows |
| Energy Star qualified windows, doors, and skylights | | | | Lincoln Wood Products/Timeline Vinyl Products, Inc. |
| are highly advised for your home improvement plans. | | | | Lindal Building Products |
| To get an Energy Star rating, manufacturers must | | | | Loewen Windows |
| produce windows that are highly efficient at | | | | Magic Window |
| transfering solar energy while also insulating against | | | | Marvin Windows and Doors |
| heat loss. | | | | Milgard Windows, Inc. |
| As of the writing of this article, the following | | | | Nan Ya Plastics Corporation |
| manufacturers offered Energy Star windows. | | | | NanaWall Systems |
| Acadia Windows and Doors | | | | New Morning Windows |
| Accurate Dorwin Company | | | | P.H. Tech Inc. |
| Alside, Inc. | | | | Pacesetter Corporation |
| American Integrity | | | | Parrett Windows |
| Amerimax Building Products, Inc. | | | | Pella Corporation |
| Amsco Windows | | | | Philips Products |
| Andersen Corporation | | | | Pollard Windows |
| Anlin Industries | | | | Prima Products, Inc./Polybau Vinyl Windows |
| Atrium Windows & Doors-WA | | | | Quaker Window Co. |
| Biltbest Windows & Doors | | | | RSL Inc. |
| Canadian Vinyltek Window Corp. | | | | Reliance Windows |
| Cavco Windows & Doors | | | | Republic Windows & Doors |
| CertainTeed Corporation | | | | Semling-Menke Co. Inc. |
| Clearview Industries | | | | Sierra Pacific Windows |
| Comfort Line Windows | | | | Simonton Windows |
| Crestline Windows | | | | Slocomb Industries, Inc. |
| Deck House, LLC | | | | Starline Windows |
| Deluxe Windows | | | | Sunrise Windows, Ltd. |
| Drutex Windows and Doors | | | | Superior Engineered Products Corporation |
| Eagle Window & Door, Inc. | | | | Superseal Mfg. Co., Inc. |
| Empire Pacific Industries | | | | The Peachtree Companies Inc. |
| Fibertec Window and Door Mfg | | | | Thermal-Gard, Inc. |
| Fleetwood Windows & Doors | | | | Thermo-Twin Windows |
| Four Seasons Solar Products, LLC | | | | U.S. Block Windows Inc |
| Gienow Building Products, Ltd. | | | | Veka, Inc. |
| Great Lakes Window | | | | Vetter Windows |
| H Window Company, LLC | | | | Weather Shield Windows & Doors |
| Hayfield Window & Door Co. | | | | Windford Window and Door LLC |
| Hurd Millwork Company, Inc. | | | | Window Mart |
| Inline Fiberglass | | | | Window Products, Inc. |
| International Window Corp. | | | | Windsor Window Company |
| JELD-WEN, Inc. | | | | While these companies offer Energy Star Windows, |
| KVW Windows & Doors | | | | only a portion of their window lines may apply. |