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Towne Bank - Ghent Branch, in Norfolk, Virginia, features 18 Hope's Landmark175 Series steel windows with Thermal Evolution Technology, and a 5000 Series custom-formed steel swing door with Thermal Evolution Technology. Photo by Walker & Laberge

Most Innovative Curtain Wall, Window or Storefront Product

Hope’s Thermal Evolution Technology

Hope’s Thermal Evolution technology is a breakthrough solution for hot-rolled, solid steel windows to meet increasingly stringent energy efficiency standards in residential and nonresidential applications. According to Hope’s officials, steel is five times more thermally resistant than aluminum. Now, with Thermal Evolution technology, all the intrinsic strengths of solid hot-rolled steel are maintained along with enhanced thermal efficiency, exceeding today's most stringent thermal codes, according to the company.

A Hope's window or door equipped with Thermal Evolution technology features a fiber-reinforced polymer isolator that is precision- machined to nest within Hope's traditional hot-rolled solid steel frame profiles. The highly thermally resistant FRP isolator is structurally bonded to Hope's steel window and door frames to create a powerfully strong and enduring composite construction that delivers impressive thermal efficiency and enhanced resistance to condensation, according to company officials.

Profile of Hope’s Landmark175 fixed window with Thermal Evolution technology. Photo by IMG_INK.

A Hope’s Landmark175 Series system with Thermal Evolution technology achieved a 0.170 U-factor, and a condensation resistance rating of 49 for fixed windows and 36 for operable, according to testing results from the National Fenestration Rating Council. Thermal performance varies depending upon glass make-up and other variables of a window. For example, triple-paned windows will produce an even better U-factor.

Additionally, Hope’s did not split its frames to create thermal breaks. Some thermal breaks are created in metal windows by splitting frames into exterior and interior sections, then reconnecting the sections with a polymer. However, this method, if applied to a Hope's window, would undermine its structural strength, potentially affecting durability and longevity, according to company officials. To retain the structural strength and durability, Hope’s developed a design that allows the solid steel windows to remain completely intact for the full depth of the window profile.

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Katy Devlin is editor for Glass Magazine. E-mail Katy at