
When it comes to making the home energy efficient, windows are a huge issue. After all, although they let in the light, they let in the light. What I mean to say is that on the one hand, we don’t have to burn every light in the house during the day, and on the other hand, they also let in heat. So they beg for energy-savings steps.
The question is, does it make more sense to replace the existing contractor grade windows with double or triple glazed argon-filled Energy Star windows (whew, that’s a mouthful!), or compromise budget and efficiency and install solar window film?
The Home Envelope

First, a bit of an overview to put it all in perspective. How efficient the home is depends on the entire home envelope. I love radiant barrier foil in the attic. It is more effective (in the big picture) in a one-story house than a two-story house. Why? Because with one floor, the roof is a larger percentage of the total envelope.
Conversely, on a two story, windows comprise a bigger envelope percentage than they do on a one story (Two stories = twice as many windows). What I’m trying to say here is that all renovation projects that lower utility bills are important, but each home’s priorities are different.
Let’s get this out of the way first - do your radiant barrier as a first line of defense. And do this job yourself. Labor charges double the price of the project and only the cost of the material is eligible for the stimulus package energy tax credit.
Now, Focus on Energy-Efficient Windows
Alright, how much money do you have left? In the real world, this determines what to do about the windows. Energy Star replacement windows are optimal, but boy, are they proud of them at the check-out counter. If you can afford them, go for it. Don’t forget to upgrade your homeowners insurance policy.
This is likely not a DIY project for most folks.
On the other hand, solar window film is a great DIY job, considering that you have patience. And it makes less of a mess than complete window replacement. It’s available in several shades, and if you’re after privacy, there’s a mirrored finish available.
As a further compromise, your remodeling budget might justify replacement windows on the side of the house that takes the sun’s hammer most violently, and apply film on the more docile sides.
So in answer to, “Window replacement or window film?,” the answer, like many things in life is, “It depends.” Don’t you love it when I’m ambivalent?



