Apex Energy Solutions, a dealer for next-generation window and eco-friendly building products, today unveiled the latest in its line of replacement windows that have saved Central Indiana residents an estimated 465 billion BTUs, or the equivalent of more than 3 million gallons of heating oil.

With standard triple-pane technology and proprietary components, the Insignia e2 window series exceeds current industry standards for energy efficiency and durability. Apex will begin installing the Insignia e2 window in homes …