Exterior Windows
Energy Star estimates that replacing existing windows with Energy Star Qualified windows can save between 7-15% on energy bills. For California, Energy Star estimates savings of between $71-$146 per year for a typical home, depending on whether you are replacing double pane or single pane windows. In addition, high efficiency windows can help eliminate cold drafts in winter and leaking air conditioning in the summers and keep your home’s temperature more consistently comfortable. Special coatings on the glass will also protect your interior from fading and bleaching.
Energy Star Qualified windows come in a variety of framing materials.
Fiberglass frames are strong, durable, low maintenance, and provide good insulation. Fiberglass frames can be either hollow or filled with foam insulation.
Vinyl frames are low maintenance and provide good thermal insulation. Sections may be hollow or filled with foam insulation. Wide vinyl sills may be reinforced with metal or wood.
Aluminum frames are durable, low maintenance, recyclable, and typically have at least 15% recycled content. Frame design typically includes thermal breaks to reduce conductive heat loss through the metal.
Wood frames are strong, provide good insulation, and are generally favored in historical neighborhoods. The exterior surfaces of many wood windows are clad (or covered) with aluminum or vinyl to reduce maintenance.
Combination frames use different materials separately throughout the frame and sash to provide optimal performance. For example, the exterior half of a frame could be vinyl while the interior half could be wood.
Composite frames are made of various materials that have been blended together through manufacturing processes to create durable, low maintenance, well-insulated windows.
To check if there are any incentives or rebates available for this product in your area, please visit the Database of State Incentives for Renewables and Efficiency (DSIRE).
Minimum Requirements
- Window products must be NFRC Certified and meet ENERGY STAR Certification requirements:
- U-Factor ≤ 0.32
- SHGC ≤ 0.30
- Window product must replace existing window product; no window additions.
- NFRC label for each different product to be submitted with Completion Certificate.
- Product must installed per manufacturer’s specifications.
- Product must meet Title 24 requirements.