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The poor thermal insulating building windows, especially single pane windows,are wasting ~7% of the total energy consumed by the U.S. every year. This paperpresents an electrostatic force suspended polymer-air multilayer (EPAM)structure as a highly transparent and energy efficient window retrofittingsolution for low-income single pane window users. To provide controllable andstable suspension force between large size compliant polymer films withoutdeteriorating their visual transmittance (Vt), corona discharge (CD) wasinduced to permanently charge polymer films, leading to controllable permanentsurface potential difference between two sides of CD charged films.Liquid-solid contact electrification (CE) was combined with CD to realizeprecise control of the surface potential of each side of polymer films. CD+CEtreated films can obtain programmable and stable electrostatic forces to formresilient EPAM structures for cost and energy effective window retrofittingpurpose. The resilient EPAM retrofitted windows can provide U-factor lower than0.5 Btu/hr/ft2/{\deg}F, Vt higher than 70%, haze lower than 1.6% at cost lowerthan $7.4/ft2, at least 10 times cheaper than double pane windows. The energysaved by EPAM can reach as much as the order of 106 kJ/m2 per year. The CD+CEsurface potential programming solution also provides a highly repeatable andcontrollable way for other electrical potential related technologies.

Electrostatic Force Suspended-Air Multilayer (EPAM) Structure for Highly Transparent Energy Efficient Windows