In New Zealand homes, it is recommended that all windows and doors have double glazing.

Good double glazing offers heat retention while reducing or removing condensation build up in cold weather, significantly improving thermal comfort.

Agents for AGP Glass

Design Windows are proud to be agents for AGP Glass – New Zealand’s all-round best performing double glazing. The AGP System is a high-performance system that uses the best components and technology available in New Zealand.


ATS - Architectural Thermal Spacer – A warm-edge spacer that bonds the 2 glass panes of your double -glazed windows and doors apart and creates an airtight bond to ensure the best gas retention of argon gas used in The AGP System.

Argon gas – An invisible inert gas which is used as an insulator to create an additional barrier to heat loss in the winter and heat gain in summer, improving thermal performance.

Bonded to glass and secondary sealant – A continually evolving formulation used to ensure durable bonding between glass panes. This creates an airtight seal for the space between panes, providing additional protection for the primary seal.

Solux-E® – A low emissivity (Low-E) coating on the glass, which is virtually invisible. It is applied to the inside surface of the exterior glass pane, improving the level of insulation in the home. Reducing winter heat loss through the glass and the reverse in the summer to limit overheating.

Solux-Ultra – Due to its superior solar control, Solux Ultra™, is the best choice for homeowners wanting to control overheating and is highly recommended for building with higher window-to-wall ratio (WWR).

For more information on The AGP System please visit

AGP Architechtural Glass Products logo

Things to consider when choosing glass

When choosing the glass for your doors and windows there are many things to consider that can impact the comfort of your home. The type of glass used can influence

  • light entry and privacy
  • better thermal control for heat retention or exclusion
  • condensation & draft reduction
  • sound dampening with reduced external noise
  • UV control to reduce glare and fading

Design Windows can provide the perfect glass solution to address any issue. Contact your local branch to discuss your requirements.

Clear Glass

Clear glass is transparent meaning most UV light and solar heat passes through it. A single pane is economical, but has a high heat loss in winter.

To reduce heat loss Double Glazed clear glass contains a thermally effective air gap between the panes. Double glazed windows and doors offers great heat retention, reduced condensation and reduced external noise, creating a comfortable home.

Tinted Glass

Tinted glass is designed to significantly reduce solar heat, UV rays and glare. Tinted glass is best suited to windows and doors that face North or West receiving intense summer sun. Tinted glass is available in a number of colours such as grey, blue, bronze and green.

Get excellent windows and doors from Design Windows

Our experienced team will work with you to find the perfect fit for your next project.