Thermally efficient joinery with an insulator stitched into the core of our aluminium window system

Double glazing is standard these days. But our innovative ThermalHEART technology takes the fight against winter cold a step further, with an additional thermal insulator stitched into the core of our aluminium window system.

Why choose ThermalHEART?

Comfort: Choosing windows and doors that increase your family’s wellbeing makes perfect sense.

Warmth: Keeping cool temperatures out in colder months, and decreasing solar gain in warmer months assists in year-round warmth and comfort.

Health: ThermalHEART can aid in managing the risk of condensation forming, therefore reducing the risk of mould growth.

ThermalHEART offers:

  • Thermal performance up to 35% better than standard double glazed windows
  • A full range of window and door options are available
  • Heights of up to 2.1m for Residential Series and 2.4m for Metro Series generally apply
  • Dual colour is available within the Metro Series range – different colours on the interior and exterior.
  • Doors with a thermal break built into them may experience slight temporary bowing due to the difference in temperature between the inside and the outside of the door, especially when exposed to direct sunlight.

Explore ThermalHEART houses

ThermalHEART Technology


Covid-19 Alert Level 2 and 3

All Auckland and Hamilton based Altherm Window Systems manufacturers are open for business with strict adherence to Level 3 guidelines, thus their showrooms are closed until further notice. All other Altherm Window Systems manufacturers nationwide re-opened on September 8, 2021 with strict adherence to the Level 2 guidelines. We encourage you to interact with our Chatbot during this time for immediate assistance.