Indow

Indow (operating under Indow Windows) is an innovative manufacturer in the window insulation and acoustic retrofit industry, celebrated for its patented, compression-fit interior window inserts. Designed as a high-performance alternative to costly and disruptive full-window replacements, their custom-built acrylic inserts press directly into existing window frames to deliver immediate draft blocking, thermal insulation, and sound dampening. For architects, builders, and historic preservation designers, Indow provides a non-destructive secondary glazing system that preserves the architectural integrity and original character of legacy, out-of-square windows while meeting modern energy standards. Industry professionals searching for interior storm windows, acoustic window retrofits, historic window insulation, and magnetic-free compression window inserts can easily specify these American-made solutions to enhance building envelope performance and optimize occupant comfort.

Specification Highlights:
• Engineered with a patented, silicone-based compression tubing that creates a tight, near-airtight seal within the interior window frame without requiring tracks, screws, or mounting hardware.
• Utilizes lightweight, optical-grade sheet acrylic instead of glass, providing superior thermal insulation (equivalent to double-pane performance) and up to 70% noise reduction (up to STC 51 in specialized PRO systems).
• Custom-fabricated in the USA using a proprietary laser-measuring system to ensure a precise, guaranteed fit (99%+ accuracy rate) even in severely warped, settling, or out-of-square historical window frames.
• Offers a non-destructive, fully reversible installation process that complies with strict historic preservation guidelines, making them ideal for landmarked buildings and historic retrofits.
• Available in specialized performance grades to address specific architectural demands, including Thermal (standard draft/heat control), Acoustic (maximum decibel reduction), Museum (98% UV blockage), and Shade (privacy and solar heat reduction).