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Heat-Reflective Window Coating

Colorado State University (CSU)
ARPA-E Award: 
Fort Collins, CO
Project Term: 
05/05/2016 to 11/20/2019
Project Status: 
Technical Categories: 
Critical Need: 

Commercial and residential building heating, ventilation and air conditioning (HVAC) systems accounted for roughly 14% of U.S. total energy consumption in 2013. Air conditioning alone consumes about 2.2 quads of energy per year, a significant portion of which is used to counteract heat from the sun coming through windows. This heat comes through windows in the form of visible light and invisible infrared light, which can quickly heat a room. Reflective window films are commercially available to prevent near-infrared light from penetrating windows. However, high upfront costs for materials and installation (mostly due to skilled technicians installing window films) and low transparency (i.e. the window may look dark) deter potential consumers across all sectors. Window coating innovations that simplify window installation, reduce production costs, and improve optical properties could encourage greater adoption of energy-saving window coatings.

Project Innovation + Advantages: 

Colorado State University (CSU) and its partners are developing an inexpensive, polymer-based, energy-saving material that can be applied to windows as a retrofit. The team will develop a coating consisting of polymers that can rapidly self-assemble into orderly layers that will reflect infrared wavelengths but pass visible light. As such, the coating will help reduce building cooling requirements and energy use without darkening the room. The polymers can be applied as a paint, meaning that deployment could be faster, less expensive, and more widespread because homeowners can apply the window coatings themselves instead of paying for a technician. The team estimates that up to 75% of the dry film could be produced from commodity plastic, which has the potential to significantly reduce the current costs associated with manufacturing window coatings.

Potential Impact: 

If successful, the CSU team estimates that widespread installation of this paintable coating could save roughly 0.4 quads of energy annually.


Increasing energy-efficiency is one of the easiest ways to reduce US reliance on energy imports.


Innovative and widely adopted window coatings could drastically reduce energy consumed to cool homes and businesses and therefore avoid greenhouse gas emissions from electricity generation.


CU-Boulder estimates that their technology could be sold for nearly one third of the cost of existing window coating technologies, saving consumers money.

ARPA-E Program Director: 
Dr. Marina Sofos
Project Contact: 
Garret Miyake
Lawrence Berkeley National Laboratory
Release Date: