Achieving Enlightenment

11th November 2026

Heritage Trade Frames has achieved extraordinarily low U-values across its Profile 22 PVC-U window and door range using Regency Triple featuring Corning Enlighten glass.

Recent testing saw the company’s casement window achieve a whole-window U-value of 0.84 W/m²K, while its PVC-U doors achieved 1.00 W/m²K and under.

Whole-house offering

Lee Darcy, the head of sales and marketing at Heritage Trade Frames, said: “These are excellent results. With energy efficiency increasingly important across the market, being able to offer U-values of 1.00 W/m²K and under gives our customers a compelling whole-house proposition.”

The 0.84 W/m²K window result sits significantly below the 1.2 W/m²K notional window U-value used within the Future Homes Standard, highlighting the levels of thermal performance available from the Heritage Trade Frames and Regency Triple combination.

Regency Triple

Developed by Regency Glass in collaboration with Corning, the Regency Triple uses an ultra-thin 0.5mm centre pane to deliver the benefits of triple glazing without the traditional weight associated with conventional triple-glazed units.

At just 5% heavier than a conventional double-glazed unit, its construction helps minimise the additional transport, handling, installation and hardware demands traditionally associated with triple glazing.

Available in 28mm and 36mm and 40mm units, Regency Triple can be incorporated within standard 70mm PVC-U systems, making it suitable for applications across domestic replacement, social housing and new build.

Meeting demand

Darcy continued: “The real advantage for our customers is that exceptional thermal performance doesn’t have to come at the expense of practicality. They have access to familiar, proven PVC-U window and doors that can deliver the increasingly demanding levels of energy efficiency the market requires.

“The market is moving towards ever-higher standards of energy efficiency and these latest results put our customers in an excellent position to capitalise on that opportunity.”

Picture: Heritage Trade Frames has achieved impressive U-values with its next generation triple glazing.

www.heritagetradeframes.co.uk

With energy efficiency increasingly important across the market, being able to offer ultra-low U-values gives our Heritage Trade Frames customers a compelling whole-house proposition.