Should I Upgrade to Energy Efficient Windows?

Should I Upgrade to Energy Efficient Windows?

How energy efficient are windows? Frankly, not very energy efficient at all!

Most single pane windows have an energy efficiency rating of R-1. Ok, so let's really make the windows energy efficient and install high efficiency, insulated, double pane, (Thermopane) windows. Wow, we just doubled their efficiency to R-2!

Now let's really get tough and add Low E glass! We just increased the efficiency to R-3!

Sure, you can add Argon and triple pane windows to your New Custom Built Home but how much energy will you really save? Last time I checked, the payback period for adding double pane, low E glass windows to your home is way over 15 years. That's 15 years before you save a dime!

I'm not against insulated windows but I think it's important to know what you're getting for your investment. I provide information to my homeowners, it's up to them to decide where they want to spend their $$$.

To put R values into perspective, most homes have R-30 insulation blown into the attic and insulated block walls an R-11.

If you want to save money on your future power bills look carefully at every window that the Architect draws on your plans. Don't make any exterior windows or doors any bigger than necessary. 

Remember, if you want to equal the efficiency of double pane, low E windows over single pane windows all you have to do is eliminate 18SF of glass on the outside of you home. That's just one 3' X 6' window!

One other thing to consider before you upgrade to double pane windows is seal failures. It's a common problem with insulated glass. Replacing one pane of insulated glass with a seal failure costs $200 each. 

There's a joke among Realtors, don't show a home with insulated windows until afternoon. By then, the condensation in between the glass, due to broken seals, has evaporated.

If you decide to invest in insulated windows, check the warranty carefully to make sure that window seal failures are covered. Be careful of buying cheap windows as you usually get what you pay for.