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Duck Technologies

KulVue® plasmonic window coating

Cooler buildings. Clearer views.

Buildings weren’t designed for a hotter world. KulVue® is an invisible coating that turns back solar heat at the window, on the glass you already have.

See how it works View deployments
How KulVue-coated glass separates daylight from infraredThree parallel rays of sunlight travel toward a pane of glass. At the coated pane each ray splits: visible daylight passes straight through into the room, keeping it bright, while the invisible infrared that reaches us as heat is intercepted at the glass and reflected back outside.COATED GLASSSUNLIGHTDAYLIGHTINFRAREDpasses throughreflected away
Diagram: sunlight strikes KulVue-coated glass. Visible daylight is transmitted into the room; the invisible infrared is blocked at the coating and reflected away.

  • 100 m²

    deployed to date

  • 4 live sites

    across Sweden

  • Real-time

    IoT monitoring

  • Uppsala University

    research-backed

The problem

The heat is already here.

Summers across Europe are getting hotter, faster than our buildings can adapt. Most of the continent’s building stock was designed for a climate that no longer exists.

The default answer is air-conditioning: expensive to install, expensive to run, and carbon-heavy at exactly the moment we need to be cutting emissions. Cooling a building should not be what warms the planet.

+212%

increase in EU building cooling-energy use, 2010–2019

75%

of EU buildings are energy-inefficient; 35% are over 50 years old

−30%

productivity lost to heat in offices and schools

Sources: European Environment Agency · EU Renovation Wave · The Lancet

The culprit

It’s the glass.

Solar heat pours straight through ordinary glass and overheats the rooms behind it. The window is not a small part of the problem. It is nearly all of it.

The existing fixes each force a trade-off: tinted films and blinds darken the rooms they protect, smart glass costs too much, and replacing the windows outright means replacing the windows outright.

87%

of unwanted solar heat enters a building through its windows.

The solution

KulVue®

Invisible heat shielding for glass you already have.

A thin, clear coating that intercepts the sun’s invisible infrared before it becomes your problem, while the daylight comes through untouched.

  • Heat blocking, clear glass

    Cuts solar heat gain without darkening the view.

  • Retrofit-ready

    Applied directly onto existing windows. No replacement.

  • Fast application

    No specialist installation. About 15 ml per m².

  • Safe & sustainable

    Non-toxic and independently validated.

Understand the science

Proven in real buildings

Cooler rooms, measured in a real classroom.

In a pilot at an occupied preschool, coated glass was measured against untreated glass under identical conditions, on the building’s existing windows.

See all four sites

With KulVue

22.4°C

Untreated

23.9°C

Glass surface temperature, same conditions, occupied preschool pilot.

Energy savings today. Net-zero tomorrow.

Talk to us about your building. Owners, facility managers, partners, and investors welcome.

Talk to us Meet the team