The Top 6 Replacement Window Options To Maximize Energy Efficiency

Your home’s windows will always be the thermal weak point in any wall assembly, as compared to insulated wall materials.  But there's hope!  Newer, high-tech, energy saving options can help ensure the optimal efficiency to save you big money on utilities down the road.

We've researched all the options for new replacement windows and compiled our top 6 choices for maximizing energy efficiency.  These are widely available from most manufacturers, and prices per option vary.  While making your wish list, keep in mind that the ROI for each option will vary based on the overall cost and the relative impact on efficiency. 

1. Multiple Panes of Glass

• Double-pane glass filled with inert gas insulates nearly twice as well as single-pane counterparts, making replacing your old single pane glass windows a no-brainer.
• Triple-pane glass offers even more insulation. Triple Pane will increase the overall efficiency of the window unit and decrease the rate of energy loss or U Factor (the measurement of how much energy escapes your house through the glass). However, triple pane glass comes at a premium and varies in cost ranging from $50-$200+ per window, depending upon the manufacturer.  Often, triple pane windows are used on the side of the house with a southern exposure to reduce the impact of the brutal afternoon sun. The added cost in that instance may provide an even stronger ROI and should be considered to maximize energy efficiency.

2. Low-E Glass Coatings

• Low-Emissivity (Low-E) glass coatings are layers of thermal protection that aid in reflecting summer heat and retaining interior cooling in the summer months and reflecting cool outdoor temperatures and retaining interior warmth in the winter months. Likewise, these Low-E coatings will block UV rays that can contribute to the fading your home’s soft furnishings such as drapes, curtains, sofas and carpets.

3. Argon Filled Glass Panes

• Argon is a natural, inert, colorless, non-toxic gas that is denser than air. When placed between panes of glass, argon adds additional insulation. This feature can further reduce the transfer of heat or cold, making a home significantly more energy-efficient and comfortable.

4. ENERGY STAR Certified Replacement Windows

• When you select energy-efficient options that meet or exceed ENERGY STAR® guidelines for performance ratings, you can be confident that you will save significantly on your energy bills. (See our blog on performance ratings.)

5. Foam-Fill

• Foam filled frames and sashes reduce the thermal conduction of the frame or sash. Many manufacturers offer foam filled frames and sash extrusions that can increase the efficiency of those components.

6. Quality Installation

• High quality replacement windows are only as effective and efficient as their installation. For example, the best performing window on the market, if installed incorrectly or out of scope of best practices, will leak air like a sieve. Consequently, taking the time to find a reputable home improvement contractor with a solid reputation in replacement window installation is a must.