U-factor difference between 0.2 and 0.3 on fiberglass windows
Appreciate the feedback on my Colorado fiberglass window question posted the other day. Here is the follow up question.
How much more energy efficient and comfortable will we get in Windows that have U-factors that are 0.2 rather than 0.3? All our window choices for our new build in Colorado at 7000 feet are fiberglass. Alpen windows have U values around 0.2 and the others Migard Ultra, Kolbe Forget, and Marvin Integrity are about 0.3 on average.
The Alpen are however 30 percent more dollars.
Worth the extra money?
Will we get more comfort with the better ?