8 times more heat escapes through old window glass than any other building material in your home

Double Glazing

That’s why upgrading the glass in your existing window frames makes perfect sense. EnerGlaze Low-E-Plus™ can achieve thermal efficiencies in a double-glazed unit that are up to 70% better than standard double-glazing when retrofitted into existing window frames. Our double glazing unit retrofitted into the existing window frames will give you a U-value of 1.0 W/m²K.

Heat Loss Test
New Windows


  • A warmer, more energy-efficient home
  • No need to change your window frames
  • No redecorating required
  • Save up to €400 a year on heating bills
  • Costs up to 50% less than new windows
  • Up to 70% more efficient than standard double glazing

What we do - 3 Simple Steps

  • We survey your existing window frames and ensure they are suitable for an upgrade.
  • Once the new glass units are manufactured we agree and book a suitable installation date.
  • Our installers remove your glass, install your new heat-retaining glass and remove and recycle your old glass units.
Retrofit Low-E glass
Low Energy Plus Windows

New Low Energy Plus Windows

Low Energy Plus windows combined with Low-E-Plus2 glass will give an overall window u value of just 1.1 W/m²K making it the lowest U-value double-glazed window on the Irish market today.

  • Most energy efficient double-glazed units in Ireland
  • Lowest combined U-value of 1.1
  • 25% better than standard double-glazed replacement windows
  • Energy rating similar to triple-glazing
  • High security multipoint locking
  • Available in a wide range of colours and finishes