Learn How Manufactured Housing Windows Became More Energy Efficient

The nonprofit Snug Home Program used a groundbreaking window technology to weatherize manufactured housing in a pilot project with CLEAResult. The pilot involved installing 603 Indow window inserts in 58 manufactured homes in southeast Michigan.

The Goal: To improve energy efficiency and eliminate significant condensation problems stemming from subgrade construction practices.

indow window snug home

The Problem


Manufactured homes have thin window frames, subject to warping.

  • Poor air seal.
  • Poor insulation.
  • Difficult to retrofit because frames are out of square.

The Solution

indow window snug home

Indow’s interior window inserts are laser-measured to fit out-of-square windows precisely. Edged in a silicone compression tubing, they fit snugly inside existing window frames. Preliminary results from the pilot study were impressive. The inserts lead to a:

  • 304% increase in U-factor performance.
  • 100% satisfied customers.
  • Zero waste. No windows were mismeasured. Two technicians installed inserts in six homes each day.

The Snug Home Program is your nonprofit partner in securing funding, working with utilities and minimizing risk in weatherizing homes.


About Indow Inserts

Indow interior window inserts increase the thermal performance of existing windows by:

  • Silicone compression tubing seals out summer heat and winter cold. The U.S. Department of Energy found they reduced energy use in a Seattle home by 20 percent.
  • Reduces noise up to 70 percent.*
  • Installs in minutes, even with severely out-of-square window frames.

*Note, overall noise reduction performance depends on how much noise is coming through walls, ceilings, floor, and doors. The window noise reduction will be less when Indow inserts are placed over double-pane windows. We do not recommend Indow inserts for reducing noise coming through laminated glass windows, triple pane windows, or hurricane windows.


Indow is committed to historic preservation and battling climate change, and we are always on the lookout for opportunities to make a difference. If you have an energy efficiency project that you think we’d be interested in, let us know by filling out the ‘Get A Free Estimate’ form below.

Get A Free Estimate
bedroom with window with indow inserts installed for soundproofing in san francisco