The Most Energy Efficient Windows for Your Home

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A thermally efficient window with a


Windows and Doors by The Men With Tools have hands down the most energy efficient windows available in the double pane glass category. We’re not just saying that to make a quick buck off your hopes and dreams, either. Other guys might make wild claims to close a sale, but we can back it up.


We told our manufacturer to take their best window and make it even better. The result? ThermaLast windows, the most energy efficient double pane windows you’ll find anywhere. If you want to see what makes our windows so much better, we’re happy to show you. So, makes our windows so energy efficient? Our performance ratings by the National Fenestration Rating Council are the best of the best.


The NFRC measures 4 different factors to determine how well the windows function.

  1. The amount of air infiltration through the frame
  2. Heat loss through the glass, also known known as U-Factor
  3. Solar Heat Gain Coefficient (SHGC) to block heat from the sun
  4. Your window’s ability to resist heat loss over time, called the R-Value


Installing our exclusive brand of windows in your home can make a world of difference. They outperform the other guys in all four of these categories. 


4 Ranking Factors for Window Energy Efficiency


Air Infiltration

An image of a window with arrows demonstrating the air infiltration through the frame.

Air infiltration is the amount of air that your windows allow into a room, even when they’re closed. It’s measured on a scale of 0 and 1, with lower numbers meaning less air and higher numbers meaning more air. 


There are several reasons why your window might be leaking while it’s closed, letting in that cold, uncomfortable cold draft that nobody likes.


The first is that the window sashes may not be well insulated, so air passes right through.


Another reason is that the frame itself may be made of poor quality materials that don’t hold up well against the wind. Lastly, your window guys might have just cut corners during the installation. That’s something we never do.


Ideally, you want as little air escaping through your windows as possible, to prevent drafts.


To give you an idea of what that means, the average Air Infiltration rating for today’s most popular double pane windows is between 0.20 and 0.30. But it can go higher. ThermaLast Windows have an Air Infiltration rating of 0.02 and 0.01. That’s 15X more than the industry standard!


Not only do our windows themselves have better air infiltration, but we also take care of some of those issues during the installation itself. We provide airtight insulation and sealants the other guys just don’t do. All of that makes for more comfort, better temperature control, and a lower electricity bill for you.



Image of a window with arrows demonstrating heat escaping through the glass.


U-Factor represents how much heat your home loses through your window’s glass. It’s also measured on a scale from 0 to 1, with lower numbers meaning less heat is lost.

ThermaLast Windows have a U-Factor between 0.22 and 0.24, lowest of any double pane on the market! That means you’ll get the lowest escape of heat through the glass you can find. We use Thermal U Plus coatings on the room side of the glass for all our windows.


This long-lasting coating helps to reflect heat back into your home to prevent it from escaping.


That means you won’t have to spend nearly as much money keeping your house comfortable, because once it gets warm it stays warm!


But the U-Factor rating doesn’t stop there. Between each layer of glass is argon gas. The combination of these things ramps up the insulation of the glass and outperforms any conventional double pane window out there.


Solar Heat Gain Coefficient

Image of a window with arrows demonstrating the heat from the sun warming up the home through the glass.

The SHGC or Solar Heat Gain Coefficient is all about how well your windows actually block the heat from the sun from warming up your house. You may think the sun warming up your house is a good thing because it means using less energy in the winter. But believe us when we tell you that in the summer, the last thing you want to do is to be baking like you’re inside an oven in your own home or living with the lights off just to keep things cool.


SHGC is, once again, measured on a scale from 0 to 1.


And, you guessed it, the lower the number, the better. Our SHGC is between 0.21 and 0.19.


When you get windows from those other guys, you may be dealing with an SHGC of 0.31 or higher. So the price tag may be cheaper, but the cost of your electric bill sure won’t be! Just like our Thermal U Plus coating helps to keep the warmth from your central heating inside your home, it also works to keep the heat from the sun out. 


That means you can let the natural light shine in the summer without turning your home into an oven, or blasting the AC just to keep cool.


Image of a window with arrows demonstrating heat reflecting away from the glass. What R-Value tells you is how well your windows resist heat loss. So, if you’re running the heat to stay warm and comfortable in the winter, the R-Value determines how well you can maintain that temperature without abusing your thermostat. 


R-Value is typically measured on a scale from 0 to 50, but unlike the other values here, higher numbers equal higher heat loss resistance, which in this case is actually better. ThermaLast windows have an R-Value of 23.20 R. That’s better than other vinyl foam-filled windows, and even most walls inside your home. 


Our window frames are insulated similar to a refrigerator door.


So you can effortlessly maintain your temperature inside, no matter what’s going on outside.



Energy Saving Windows By The Men With Tools


When it comes to double pane glass, Windows & Doors By The Men With Tools has the most energy efficient windows you can get. Our air infiltration rating is better, our U-Factor is better, our SHGC is better, and our R-Value is better. When you compare ThermaLast to our competitors, it’s just a no-brainer. 


So, if you’re looking to stay warm this winter without using a lot of heat, or you’re just trying to cut down on your electric bill in the summer, our energy efficient windows are for you. With all the money you’ll save on your utilities, these windows will practically pay for themselves. 


Schedule your free consultation today, and get a quote locked in for the year.