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Window Attachments

Creating a window into future savings

This new program encourages the installation of high-performance commercial window attachments (secondary glazing systems) as a standard practice for competitive advantage in Northwest buildings.

Designed for use in existing commercial office, historic, educational, and government buildings with low-performance windows, window attachments are approximately half the cost of replacement and may be installed as a stand-alone energy efficiency measure or as part of a deeper energy retrofit.

The program will work to identify which building types are most cost-effective for window attachments, raise awareness of the product in the market, and partner with the Attachments Energy Rating Council (AERC), in coordination leading commercial window manufacturers, to influence national standards. 

  • Secondary Glazing System Moisture Transfer Analysis and Validation
    Northwest Energy Efficiency Alliance (NEEA) worked with Secondary Glazing System (SGS) manufacturers to measure the performance of their products using industry standard window testing procedures. This effort allowed building owners and design teams to effectively compare available product performance with consistent baseline conditions. The Ernest Orlando Lawrence Berkeley National Laboratory conducted this study to simulate and physically validate thermal and solar performance characteristics of seven window attachment Secondary Glazing Systems. This report introduces new methodology and software capabilities where industry standard practices do not exist, such as condensation resistance. It also evaluates the annual energy savings and condensation potential of all SGS systems in mid to large size commercial buildings.
    PDF, 2.52 MB
  • Secondary Glazing System Moisture Transfer Analysis and Validation
    Northwest Energy Efficiency Alliance (NEEA) worked with Secondary Glazing System (SGS) manufacturers to measure the performance of their products using industry standard window testing procedures. This effort allowed building owners and design teams to effectively compare available product performance with consistent baseline conditions. The Ernest Orlando Lawrence Berkeley National Laboratory conducted this study to simulate and physically validate thermal and solar performance characteristics of seven window attachment Secondary Glazing Systems. This report introduces new methodology and software capabilities where industry standard practices do not exist, such as condensation resistance. It also evaluates the annual energy savings and condensation potential of all SGS systems in mid to large size commercial buildings.
    PDF, 2.52 MB
  • Commercial Window Attachments, Phase 1 Research
    This preliminary market research focused on understanding the market barriers and any product performance concerns with Secondary Glazing Systems (SGS), an interior window attachment that improves the performance of existing windows in commercial buildings. The bulk of the research occurred between March and October 2017 and included a literature review, a review of existing market research, and primary data collection with representatives from projects installed throughout the United States. The limited number of in-region installations and lack of access to building contacts indicate that the Northwest Energy Efficiency Alliance (NEEA) will need to continue to collect region-specific intelligence on these products. The findings indicate that NEEA staff should consider attending trade shows or other networking events attended by glazing contractors and design teams responsible for interior rehabilitation (as opposed to new construction) to improve awareness of the product among Northwest professionals. Product "mock ups" are another common way to expose potential users to the product. The research found no industry wide concerns with the product performance nor any evidence of unexpected product failure. Additional research needs include supply chain research specific to the Northwest. This report has been updated as of 03/06/2018.
    PDF, 659.28 KB

NEEA Team Lead

Christian Miner

Sr. Program Manager