TwinGlaze was founded to solve a problem that’s everywhere but rarely addressed: the energy loss caused by aging, single-pane windows. In North America, over 2 billion square feet of commercial buildings still use single-pane windows.  These buildings leak heat, drive up utility bills, and stall progress on climate goals — not because people don’t care, but because the alternatives have never made sense. Replacing windows is expensive, disruptive, and slow. Yet doing nothing means wasted energy, rising emissions, and missed ESG targets.

We saw an opportunity to change that.

We built Taiga, a high-performance insert that upgrades existing windows without replacing it. It installs cleanly from the inside, improves thermal performance, and pays for itself in just a few years. No tenant disruption. No demolition. No compromise.

Our window inserts reduce energy costs by 40%.

Taiga was designed for the real world. For the office buildings, towers, and commercial spaces that were built decades ago and will still be standing in 2050. Retrofitting these buildings isn’t just a smart investment. It’s one of the most scalable ways to reduce emissions today. TwinGlaze was launched out of Rethink Climate, a clean-tech studio with a bold but focused mission: reduce global emissions by 1% through deployable, systems-level solutions. We’re proud to be part of that vision and even more proud to bring Taiga to market as a product that delivers both financial and environmental returns. If you own or manage buildings with single-glazed windows (circa 1950-1990), we’d love to show you how Taiga can work for you.