UMass Amherst Team Invents Photothermal Fabric "Sweater" for Buildings to Cut Heating Costs by Up to 23%

UMass Amherst researchers invent a photothermal fabric panel that harvests solar heat to keep buildings warmer, cutting heating costs by up to 23%.

By: AXL Media

Published: Apr 1, 2026, 4:35 AM EDT

Source: Information for this report was sourced from University of Massachusetts Amherst

A "Sweater" for Buildings: Reimagining Home Insulation

In a major breakthrough for residential energy efficiency, researchers at UMass Amherst have unveiled a technology that addresses climate change and energy poverty through the simplicity of textiles. While traditional home weatherization—such as replacing windows or adding thick wall insulation—is often expensive and permanent, this new tool functions like a removable "sweater" for a building. By applying a specialized photothermal dye to rugged, affordable fabrics like those used for umbrellas, the team has created a system of decorative panels that trap solar heat and insulate exterior walls simultaneously.

The Science of Photothermal Dyes and Solar Harvesting

The heart of the technology is a high-tech dye developed by Professor of Chemistry Trisha Andrew. Inspired by the way polar bear fur traps heat in extreme cold, the dye allows the fabric to absorb sunlight and convert it into thermal energy with remarkable efficiency. During testing, the researchers found that these treated panels could keep a home an average of 8.64°F warmer over the course of a day. Unlike solar panels that convert light into electricity, these fabric tiles convert light directly into heat, conducting that warmth through the building's "skin" to reduce the load on internal heating systems.

Combating "Reno-viction" and Energy Insecurity

The project was specifically designed with social equity in mind. Over 33 million U.S. homeowners struggle to pay heating bills, and many renters face "reno-viction"—a process where landlords upgrade energy systems only to raise rents beyond what current tenants can afford.