# Indow

> Indow is a Portland manufacturer of custom acrylic window inserts that press into existing frames with a silicone compression seal. Founded by Sam Pardue after he confronted the drafty original windows in his 1906 house, the company sells thermal, acoustic, UV-blocking, blackout, privacy and heavy-duty inserts to homeowners and commercial building operators. The pitch is unusually practical: improve comfort, noise control and energy performance without construction or the loss of historic fabric.

- **Founded:** 2010
- **Headquarters:** Portland, United States
- **Founders:** Sam Pardue (CEO and Founder)
- **Team size:** Approximately 39 employees in the supplied company data; LinkedIn lists 11-50.
- **Products:** Thermal Inserts, Acoustic Inserts, UV Blocking Inserts, Blackout Panels, Privacy Inserts
- **Notable:** Insulated more than 23,000 buildings across the United States and Canada, according to the company., Featured on multiple episodes of This Old House., Independent testing reported approximately 20% HVAC energy savings in specific monitored homes, with results dependent on building and climate conditions.

## Products & services

- **Thermal Inserts** — Custom 1/8-inch acrylic inserts designed to stop drafts and improve thermal comfort.
- **Acoustic Inserts** — Thicker 1/4-inch acrylic inserts designed for greater reduction of noise passing through windows.
- **UV Blocking Inserts** — Clear inserts intended to filter ultraviolet light and protect furnishings, artwork and interiors.
- **Blackout Panels** — Opaque removable panels for bedrooms, home theaters and light-sensitive occupants.
- **Privacy Inserts** — Translucent inserts that obscure views while admitting daylight.
- **Heavy Duty Inserts** — Scratch-resistant inserts for commercial or high-contact settings.
- **IndowPRO** — A commercial secondary-window system for larger projects and higher-performance glazing configurations.
- **Commercial Pilot Program** — A one-room or limited-area trial for hotels, offices, government buildings and multifamily projects before wider installation.

## Achievements

- Insulated more than 23,000 buildings across the United States and Canada, according to the company.
- Featured on multiple episodes of This Old House.
- Independent testing reported approximately 20% HVAC energy savings in specific monitored homes, with results dependent on building and climate conditions.
- The company reports a greater than 99% perfect-fit rate and nearly 200,000 tons of avoided carbon emissions.
- Built a 12-year supplier relationship with no durability-related warranty issue attributed to the silicone compression bulb, according to Sam Pardue in a 2023 partner case study.
- Maintains a 4.5/5 rating from more than 1,500 reviews on Reviews.io as of 2026.

## Latest updates

- **2025-08** — Published updated IndowPRO product data for commercial secondary-window configurations.
- **2024-07** — Recorded a roughly $132,000 debt-financing round in private-market databases.
- **2023-12** — Cooper Standard detailed its long-running engineering partnership with Indow and continued work on new seal products.
- **2023-05** — Recorded a $270,000 debt-financing round in private-market databases.

## Links

- Website: https://indowwindows.com
- LinkedIn: https://www.linkedin.com/company/indow-windows
- Twitter/X: https://twitter.com/Indowwindows
- YouTube: https://www.youtube.com/@Indowwindows
- Instagram: https://www.instagram.com/indowwindows/
- Facebook: https://www.facebook.com/indowwindows

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Profile page: https://yespress.io/indow
Published by YesPress — https://yespress.io
Last updated: 2026-08-22