Stop Replacing Your Windows. Start Upgrading Them.

The acoustic performance of an IndowPRO system is determined by the glazing selected. When using 5/16" acoustic laminated glass with a 4” air gap over a single-pane storefront window, the system has been tested to achieve an STC rating of 51, which is better than a 10” masonry wall. This level of performance, verified via ASTM E90 testing, is highly effective at blocking traffic, construction, and other common sources of exterior noise.

The total thermal performance of the combined window assembly can be exceptional. When an IndowPRO frame utilizing R-18 Vacuum Insulated Glass (VIG) is installed over an existing unbroken steel-framed, single-pane window, the system achieves a total U-value of 0.136, which is equivalent to an R-value of 7.4. This level of performance reduces thermal transfer and energy loss by over 85%. IndowPRO is also compatible with low cost glazings such as hard-coat pyrolytic glass, which improves single-pane window performance from R-1 to R-3, reducing thermal energy loss through the window by over 60%.

IndowPRO creates an exceptionally tight air seal, reducing air infiltration to less than 0.01 CFM when tested on a 3'x5' window. This performance is maintained even in bowed and out-of-square openings due to the system's overlapping flange, flexible EPDM gasketing and corner design. This drastic reduction in air leakage stops drafts and is a critical factor in improving a building's overall energy efficiency.

Yes. IndowPRO is an engineered frame system designed for compatibility with a wide range of advanced glazings from 6mm to 13mm thick. This gives specifiers the flexibility to choose the ideal glazing for their project's specific goals, including Vacuum Insulated Glass (VIG) for maximum thermal performance, acoustic laminated glass for sound control, or various monolithic Low-E glazings for a balance of performance and cost.

Yes, IndowPRO is highly effective at preventing interior surface condensation. By creating a sealed, insulating air pocket between the primary window and the room, the system prevents warm, moist interior air from reaching the cold primary glazing. This raises the dew point on the room-facing surface and on the primary glazing, significantly reducing or completely eliminating condensation and associated moisture issues, even in very cold climates. IndowPRO features integrated desiccant to remove residual moisture in the air pocket. Installation & Building Impact - FAQ Answers

IndowPRO is a secondary glazing system that installs on the interior of the existing window frame. The process is designed to be non-disruptive, involving no demolition, construction dust, or mess. The modular frame is assembled on-site and then secured in place. The installation is clean and fast, and in most cases, tenants or building occupants do not need to be distrubed.

Yes, the system is fully reversible. IndowPRO can be installed using two primary methods: high-performance VHB tape for a screwless application, or screws for specific substrates. The VHB option requires no drilling or penetration of the existing window assembly. Both methods are reversible and leave the primary glazing unchanged.

IndowPRO requires an unobstructed, flat surface of at least 1.25" in depth, perpendicular to the glass, for the frame to mount to. Common obstructions can include interior-mounted blinds, prominent locks, or other hardware. Our team can help you assess your specific window conditions to help you find a holistic window solution that fits your windows.

The system is specifically engineered to maintain a tight seal with the out-of-square conditions common in older buildings. Our precision laser measuring system captures the exact shape of the opening, and the frame's flexible corners and overlapping flange are designed to absorb irregularities, ensuring a clean, aesthetically pleasing, and airtight seal every time.

IndowPRO is designed as a fixed system to achieve its high levels of acoustic and thermal performance. This requires creating a sealed, stationary air gap. While the primary window is not operable with the system in place, IndowPRO is designed to provide easy glazing removal for periodic cleaning or maintenance. For applications requiring frequent window operation, our IndowONE compression-fit inserts may be a suitable alternative.

An IndowPRO system is significantly more cost-effective, typically representing a 60-80% savings over window replacement while offering equal or better performance. A typical commercial window replacement costs between $150 to $350 per square foot, a high upfront cost which discourages many projects. The substantial reduction in upfront capital with IndowPRO often results in payback periods of 2 to 10 years, depending on the application.

IndowPRO is designed for any commercial or institutional building where windows are a source of significant noise, discomfort, or energy loss. It is particularly ideal for projects in these key segments:

• Hospitality (Hotels, Resorts): To solve noise complaints, improve guest satisfaction and online reviews, and reduce operating costs.
• Commercial Offices: To reduce utility bills, improve comfort, and create quieter, more productive environments that attract and retain high-value tenants.
• Historic Buildings: To upgrade thermal and acoustic performance while preserving original windows.
• Multifamily & Schools: To perform cost-effective, large-scale upgrades with minimal disruption during tight renovation windows like summer breaks or tenant turnover.

IndowPRO’s modular frame system ships disassembled, or "knocked-down." This design provides two key advantages: it dramatically reduces shipping costs and the risk of damage compared to transporting large, assembled windows, and it greatly simplifies job site logistics. The components are easier to move through elevators, hallways, and occupied spaces, minimizing disruption and reducing cost.

IndowPRO and IndowONE are two distinct systems for different applications. IndowPRO is our engineered, high-performance system for commercial projects. It features a rigid aluminum frame and is compatible with advanced glazings like Vacuum Insulated Glass (VIG) and thick acoustic glass to meet demanding thermal and acoustic specifications. IndowONE uses our patented silicone compression tube and is typically paired with acrylic glazing. It is an excellent solution for residential homes, projects with specialty-shaped windows (like arches), and applications where the end-user desires frequent, tool-free access to the primary glazing.