The Definitive Choice for Heritage Professionals
Choosing the right gas fill is a matter of technical necessity, not just preference. Krypton is the industry-leading choice for heritage projects because it delivers maximum energy efficiency within the strict physical constraints of slim sightlines.
Whether your project involves delicate sash or classic casement windows, our Krypton-filled units balance thermal excellence with historical compliance. It’s the only choice for those who demand efficiency without sacrificing aesthetic heritage.