DIY Low E-Coated Windows

Low-E, or low-emittance, coated windows are double-paned windows with argon gas between the layers and coated on one or both of the inside surfaces with a glazing that reduces radiant heat movement. In warmer climates, the glazing inhibits heat from entering a dwelling; in cooler climates, it prevents heat from escaping. These approaches lower heating and cooling bills and make houses more energy efficient. However, these windows are expensive and replacing a houseful of them can be a very major expenditure. For those on a budget, plastic films are available that provide many of the benefits of modern windows, and even have a few advantages over the more expensive alternative.

Low-emittance window films
Scissors
Squeegee
Utility knife
Straight-edge

Instructions

- 1
  Measure the windows you wish to coat, and total the square footage of each and the overall square footage needed. In general, you will want to include windows facing west or south or both to block heat; for those in colder climes, coat all windows to prevent heat from radiating out.
- 2
  Purchase enough film to coat each window with a single sheet cut to size. There are films that require adhesives and are permanent; more expensive self-cling films are also available and offer a great deal of flexibility in moderate climates, since they can serve double duty, repelling heat during the summer and preserving heat in winter months.
- 3
  Clean each window thoroughly with ammonia-free cleaners. Ammonia can damage the film. Allow the windows to dry completely.
- 4
  Cut a pane of the film slightly larger than the first window, about 1 inch on all four sides. Clean the window surface again, but this time leave it damp.
- 5
  Apply the film to the window so it fits uniformly. Use the squeegee to gently flatten the film, squeezing out air bubbles. With adhesive films, the moisture activates the adhesive on the film.
- 6
  Spray the cleaner on the film and again use the squeegee to force out trapped air.
- 7
  Trim all four sides of the film with the utility knife and straight edge. Trim it slightly smaller than the window, about 1 inch, to make the film easier to remove when necessary.
- 8
  Spray the film with cleaner again and use the squeegee again to remove trapped air, if necessary.

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