We are thrilled to launch our latest product suited to Landmark retrofits where energy performance and historical character are of equal importance. Our simulated double-hung triple glazed airtight window has been approved for use on landmark projects in Brooklyn. The difference from outside is invisible, the difference from inside is clear: super comfort, super quiet and super energy efficient.


  • Durable hardwood
  • Simulate double-hung style, with fixed sash on top and tilt and turn below
  • Glazing rebate to accommodate a 52mm glazing unit
  • Triple glazed
  • Excellent airtightness and watertightness ratings
  • Argon or Krypton gas filled
  • Low emissivity glass with warm edge spacer bar
  • Range of hardware available
  • Available in a range of RAL colors, also available in dual-color (different color inside and out)
  • Center pane U-value for triple glazing as low as R 11.36 BTU/hr.ft2.F (U-value 0.088 hr.ft2.F/BTU)
  • Overall U-value for window R 8.03 BTU/hr.ft2.F (U-value 0.124 hr.ft2.F/BTU) based on 4 foot wide by 4 foot 10 inches high
  • Approved for use on Landmark projects in NYC