GPG OUTBRIEF 12

Electrochromic Windows

If you missed our last webinar, “Electrochromic Windows,” you can now access a recording of it on YouTube and view the presentation slides. A schedule of upcoming webinars and links to past webinar recordings is available on the GPG Outbrief page.

Thanks to all the presenters and to the participants for their excellent questions, some of which are answered below.

Q&A

Q: Did occupants surveyed at GSA test beds prefer EC windows?

A: There was a 100% occupant preference for EC windows at the Donna Texas Land Port of Entry. In the general office installations, between 63% and 92% of occupants preferred EC windows over the existing low-e windows.

Q: What is the lifespan of an EC window?

A: Citing ASTM testing, manufacturers say that the EC window lifespan is similar to that of other insulating glass units, usually 30 years. EC window warranties are typically 5 years for glass and electronic controls.

Q: Are there increased costs with EC windows?

A: GSA facilities have not experienced increased O&M costs. The estimated incremental cost of EC windows compared with spectrally selective low-e windows is $37/sf. 

Q: Can the appearance of EC windows match our existing windows?

A: EC windows are customizable, so they can be either complementary or similar to existing windows. In addition, if an EC window must be replaced, a new EC window can be made to match.