An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock
( )
or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Chromogenic windows tint based on outside temperature and brightness, or by automated building controls.
In a 2014 evaluation in Denver, Colorado, chromogenic windows significantly reduced heat gain over the baseline low-e window, reducing annual HVAC cooling electricity use by 10%. View full-size infographic. [PDF - 230 KB]
Reference above to any specific commercial product, process or service does not constitute or imply its endorsement, recommendation or favoring by the United States Government or any agency thereof.