What Style of Window is the Most Energy Efficient?

True or false: Your thermostat is the only thing that controls the temperature in your home.

If you have ever had a home with poorly insulated windows, you know all too well that this statement is false.

To increase the comfort factor in your home and save money, try adding energy-efficient windows. Not only do they lower your monthly bills by making your thermostat do less work, but they are also an effective way to shield your home from the outdoor elements.

Energy Efficient Glass Types for Windows

Cross cut double pane windows showing structure

Double-pane and triple-pane windows are known insulators, making them both energy-efficient options.

Double-pane windows, the more common choice of the two, have two glass layers with space in between that is sometimes filled with an inert gas. They are used in both residential and commercial buildings, and are versatile enough to fit into any window style.

Cross cut triple pane window showing structure

Triple-pane windows are common for areas with extreme weather conditions. Three glass sheets provide more protection against strong winds and harsh temperatures, and are even more energy-efficient than double-pane windows. Since triple-pane windows tend to be heavier, they are best suited for window frames that are durable and have heavy-duty hardware.

Energy Efficient Window Styles

Two window styles stand out as the most energy-efficient types on the market: fixed and casement. Here's what makes these popular styles energy-efficient:

Large windows in home


  • Fixed Windows: Fixed windows do not open like “regular” windows. Instead, they are permanently closed with a fixed frame. They allow you to take in the natural light and the view while shutting out cold air. If you are looking to effortlessly maintain your desired indoor temperature while decreasing your monthly energy bills, installing fixed windows in your living room is a picturesque way to accomplish this.

Energy efficient open casement window
  • Casement Windows: Casement windows can open, but when they are closed, they are truly sealed air tight and locked at multiple points. This makes it very difficult for outside air to penetrate through any cracks or crevices. They are wonderful for insulating a home and can help bring down your energy bill.

Energy Efficient Frame Material

Some window frames are more effective in conserving energy than others. The last thing you want to do is pair an energy-efficient glass type and window style with a frame that doesn't insulate. Below are some tips about the kinds of frames that work well.

  • Vinyl: Some people choose to replace their older wood or aluminum frames with vinyl. Vinyl is less expensive and very energy-efficient due to its ability to insulate well.
  • Fiberglass: Fiberglass frames are incredibly sturdy and can mimic wood in its look. The heaviness and strength of this type make it a more expensive option, but also one that can easily block out big gusts of wind.
  • Wood: Wood frames also are an energy-efficient option, even though maintaining the wood in the frame will cost you a bit extra.

FAQs about the Best Energy Efficient Replacement Windows

What are the best energy-efficient replacement windows?

Fixed or casement windows along with a vinyl, fiberglass, or wood frame are appropriate energy-efficient options for your home. The combination that you choose depends on the look of your home and the amount of upkeep you're willing to put into your windows.

Are energy-efficient windows really worth it?

The validity of your investment in energy-efficient windows depends on what you want and need in a window. Here are some questions to ask yourself:

  • Do my windows adequately block out pollen, air, heat, etc.?
  • Am I comfortable with the amount that I'm paying for my energy bills?
  • Do I always feel comfortable with the temperature of my home regardless of the outside weather?

If the answer to any of these questions is no, energy-efficient windows are likely a wise investment to look into.

Our Window Repair Services

Glass Doctor can repair or install your windows so that you can comfortably take advantage of your home's energy-efficiency savings. And with 24/7 emergency repair service, you never have to worry about the “right time” to call. Call us anytime for your glass repair needs and start saving big on your monthly bills. For further information, find your local Glass Doctor location, schedule an appointment online, or give us a call at (833) 974-0209.