Indow provides advanced interior secondary glazing systems that improve the energy efficiency, comfort, and acoustic performance of existing windows without requiring full window replacement.

IndowPRO is a modular secondary glazing system designed for commercial applications. It accommodates out-of-square window frames, delivers an ultra-low air leakage rate of 0.01 CFM, and, when paired with Vacuum Insulated Glass (VIG), achieves up to R-13 thermal performance when installed over aluminum single-pane windows.

IndowONE window inserts are designed to reduce drafts and stabilize indoor temperatures in existing buildings. They help address common window performance issues while providing up to 20% energy savings and reducing outside noise.

• Custom manufactured - Each insert is built to the exact dimensions of the existing window, accommodating irregular frames for a precise fit.

• High-performance air sealing - Compression tubing creates a near-airtight seal that minimizes drafts and air leakage.

• Simple installation - No tools or modifications to the existing window frame are required, allowing for quick installation with minimal occupant disruption.

• Lower-cost retrofit - Provides an alternative to full window replacement while improving energy efficiency, comfort, and noise control.

Seal/upgrade your windows

IndowPRO with Vacuum Insulated Glass can reduce energy loss through windows by more than 95%, lowering heating and cooling loads while reducing HVAC operating and maintenance costs.