5988 Mid Rivers Mall Drive #239. St. Peters, MO 63304

What Type Of Windows Are The Most Energy Efficient?


Energy Efficiency

Two words that don’t mean a ton to most homeowners until the time comes to invest in home improvement projects like Window Replacement.

Then, suddenly, it’s actually pretty serious and adds up to a sizeable amount of money.

Naturally, you want to know what type of windows are the most Energy-Efficient and whether they’re a good match for your home.

And the truth is: it depends on who you ask, who you’re reading, and whoever you’re listening to.

If you jump online and start searching around, the vast majority of the initial articles will be more marketing-based than educational. Everyone will be telling you that THEIR type of window is the most energy-efficient.

But what does the window industry say?

We could argue all day about the most energy-efficient car, but the industry knows exactly what the leading ‘on the road’ models are running on in terms of engine technology.

For windows, it’s simple: Cutting-edge, triple-pane windows are the most energy-efficient right now.

And Why Triple Pane?

The third pane of glass and all the structural window elements designed around it. And while you need to be careful because windows can vary wildly, your top-of-the-line triple-pane windows lead the way in terms of these specific window measurements:

  1. U-Factor: a window’s overall insulation value.
  2. SHGC: a window’s solar blocking value.
  3. Visible Transmittance: this is the value of light that shines through.
  4. Air Infiltration: your window’s seal value over time.
  5. Condensation Resistance: how well it resists moisture over time.

Here’s a quick animated video we produced that explains the basics of window energy ratings in less than 90 seconds (we also put together a thorough blog covering the Window Energy Performance Ratings Scale as well).

Our Windows Are Selected From The Tippy Top Performers

Thanks to consumer watchdog organizations like the NFRC and ENERGY STAR, you can know EXACTLY what you’re investing in when it comes to replacement windows. They do the measuring and add this data DIRECTLY to the product information.

Here are the ratings you’ll find on the triple-pane windows we install for our customers.

  • To qualify for ENERGY STAR certification, windows in the St. Louis metro area must have a U-Factor of 0.30 or lower. To earn their Most Efficient status, windows must have a U-Factor of 0.20 or lower. Our windows have a U-Factor of 0.17—even greater than Most Efficient standards!
  • ENERGY STAR requires an SHGC of 0.42. Our windows have an SHGC of 0.23.
  • ENERGY STAR recommends an Air Leakage rating of 0.3 CFM. Our windows have an Air Leakage rating of 0.05 CFM. (Not 0.5—0.05!)
  • ENERGY STAR recommends a Condensation Resistance rating of 50. Our windows have a Condensation Resistance rating of 70—a 56% improvement over the average double-pane window.
  • We also use Krypton gas instead of Argon because it’s twice as dense and a superior insulator. Yes, it’s also a little more expensive, but you get better efficiency and increased energy savings.

So, if we return to the car analogy, ‘triple-pane windows’ are the efficient engines, and then around them are all these structural window design elements that can enhance their performance.

For cars, it’s things like tires and aerodynamics. For windows, it’s specifics like our foam-filled frames, Intercept® Ultra Warm Edge Spacers, etc.

Another Major Consideration: Installation!

Even THEE MOST energy-efficient windows in the known universe will underperform if they aren’t installed properly. And unfortunately, these aren’t the same windows as we had in the good old days…

Can just anyone, or even any mechanic for that matter, open up the hood of a modern energy-efficient car and work on the engine?

Nope. No way.

These aren’t the ‘just pour some gasoline into the carburetor’ engines we’re talking about here.

This is why we adhere to strict Spare-No-Detail Installation!

We consider everything. Every component. Every screw, framing element, and minor detail.

Some easy examples include:

  • We use thicker, stronger, and more durable trim coil.
  • We use a low-expansion, closed-cell foam that’s a better insulator than your run-of-the-mill batten.
  • We train and pay our certified installers almost double what most other window companies do.
  • We guarantee 100% perfection and satisfaction.

Next Step: Contact Your Local St. Louis Metro Window Replacement Professionals

If you’re a homeowner in St. Louis Metro or anywhere in St. Charles County, don’t hesitate to grab your phone and Contact XteriorPRO.

We’re happy to take the time and get as deep into the details of our windows as you’d like. We can also fill you in on where our local window industry is, what you can expect during the replacement process, and more. Thanks for your time today, and we look forward to hearing from you soon.