Benefits Of Energy Efficient Windows

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Are you looking to replace your old windows or install new ones and are not sure which product to choose?

Today, homeowners have the luxury of choosing from a wide variety of window styles, shapes, sizes and materials that fit any budget.

One important thing that you need to keep in mind when shopping for windows is that regardless of what product you choose, it should be energy efficient.

These windows are not only environmentally friendly, but will also save you money during the heating and cooling seasons, while improving the comfort of your home. Understanding energy efficiency and its benefits will help you purchase windows that will be a perfect match for your specific needs.

If you are ready to install new windows, contact your local window installers for free estimates.

What is an energy efficient window?

most energy efficient windowsDepending on the temperature outside, heat is either gained or lost through the windows of your home. Ideally, a home should be well insulated, minimizing this heat gain or loss. Windows that are able to provide a sufficient level of insulation are considered energy efficient.

When shopping for windows, look for the U-factor of each product- it measures the rate of non-solar heat loss or gain through the window. Low U-factors are most desirable, as these windows provide the best insulation and are the most energy efficient.

When comparing products, keep in mind that the U-factor can refer to the energy efficiency of the glass alone, or the entire window (this would include the frame material and the spacers).

In fact, most manufacturers now offer windows that have special low-E coating on the glass for improved energy efficiency, but many frames and spacers are actually not energy efficient and have a high U-factor. For example, aluminum windows are known to have poor insulation, while fiberglass windows offer superior insulation.

You do not want to end up in a situation where you have purchased windows according to the U-factor of the glass and have neglected to pay attention to the material of the window frame itself.


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Some windows are designed to not only be energy-efficient, but to also provide “free” heating for your home, by capturing and retaining solar thermal energy in the winter, such as Trombe-wall solar thermal windows.

These liquid-filled “windows” can keep the temperature in your home at a reasonably “warm” level, without heat being on, even on a very cold winter day. However, these solar thermal windows are very expensive and the house design needs to be adjusted to avoid “overheating” during the summer months.

Benefits of energy efficient windows

Energy and Cost Savings

Low-E Argon Gas WindowsIf you live in a region with a long winter season and you spend a lot of money on your heating bill, installing energy efficient windows will make a huge difference for your home and your pocket.

During the cold months, windows that have poor insulation are the source of significant heat loss, discomfort and increased condensation.

By installing windows with a low U-factor, you will have warmer window surfaces, reduced air leakage, and minimal condensation. As a result, you will end up feeling more comfortable inside your home, as well as realize significant financial savings on your monthly heating costs.

For example, if you purchase thermally improved windows that have a none-metal frame, have a low-E coating and a low U-factor, you can save up to 25% on your heating costs.

Similarly, you will continue to save money during the summer. Poorly insulated windows are a major source of heat gain, requiring you to spend extra money to keep the AC running overtime, so that the house can be cool.

New technology now makes it possible to have energy efficient windows with low-E coatings that reduce solar heat gain, without compromising the view or the amount of incoming daylight.

Reduced requirements for a heating/cooling system for your home

Real-world performance of tripple-pane windows vs double-pane windows:

The beauty and advantage of energy efficient windows is that they not only help lower the monthly heating and cooling costs, but also reduce the peak heating and cooling loads as well.

Peak heating and cooling load is the maximum requirement for heating or cooling at one time. The particular peak requirement for your home determines the size of the furnace, heat pump, air conditioner that needs to be installed in your house for thermal comfort.

Therefore, by reducing the peak heating and cooling load, energy efficient windows can actually enable you to install a smaller, more economical heating and cooling system in your house. This would be a particularly timely and financially beneficial solution for a home that is being newly constructed.

Increased comfort inside the home

Energy efficient windows can greatly improve the thermal comfort level of your home both during the heating and cooling seasons. During winter months, poorly insulated windows have a cold glass surface, which causes uncomfortable drafts, since the air next to the window is cooled and drops to the floor.

Windows that have a low U-factor will have warmer glass surfaces and weatherstripping designed to seal tightly, leading to reduced air leakage and increased thermal comfort inside your home.

In the summer, energy efficient windows will not get overheated since the low-E coating will protect the surface from being struck and heated by direct sunlight. Thus, the home’s interior space will also be at a comfortable temperature rather than steaming hot from the incoming solar radiation.

Replacement Windows

Reduced condensation and frosting

One of the biggest issues associated with older windows that have poor insulation is condensation and frost, which collect during the heating season. This causes mold and contributes to rotting of window frames if they are made of wood.

Energy efficient windows take care of this issue, because they have warmer glass surfaces and special insulating frames.

In general, as the U-factor of windows improves, there is a much smaller range of conditions where condensation will occur.

Improved lighting and wiew

With energy efficient windows you will no longer have to resort to traditional solutions of tinted glazing or shades on your windows to reduce solar radiation during the cooling season.

New window technologies will protect your home from unwanted heat without compromising the amount of daylight or the view from your windows. When shopping, look for products that have a spectrally selective glazing such as low-E coating, or high-performance tints.

Costs for energy-efficient window options

Low-E and Argon are now pretty much a standard feature of most replacement and new construction windows, and Low-E is actually a requirement in many states. However there are “premium” features that will increase the cost of your windows – these include:

Triple Glazing, Insulated Frame, Insulated Spacer, Krypton Gas, additional exterior insulators on sashes.

All these additional energy-efficient features are usually found as upgrades to top-of-the-line windows, and not available on mid-range and low – end windows.

On average, it will cost you about $50-70 per window to add most of these features, considering you are upgrading from a mid – range window. However, the exact cost depends on too many factors specific to a particular home.

Use our Replacement Windows Calculator to estimate the cost of your windows and energy efficiency upgrades.


Cost to Install 10 New Windows
$3,520 - $6,895
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About Leo B

Leo has been a contractor since 2003, specializing in: roofing, siding, general contracting (GC) and residential remodeling. Leo is also a Certified HVAC, Oil & Gas Heating Technician/Installer. In addition to roofing and remodeling, Leo is passionate about Solar, green building and energy conservation, so a lot of my time and energy goes to installing energy efficient heating and cooling systems.


See more about Remodeling Calculator team here


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7 comments on “Benefits Of Energy Efficient Windows

  1. Rebecca Gardner

    It was interesting when you described how energy-efficient windows help reduce maximum heating and cooling loads in addition to helping with overall monthly costs. My husband and I have been unable to decide if we should have our home’s windows replaced to keep our home warm this winter. Thanks for helping me understand some of the additional benefits window replacement could have for us!

    Reply
  2. Conrad O'Connor

    It’s good that you point out that new glass windows can make your home more energy-efficient. I’ve been looking for a way to lower the cost of cooling and heating my home, so I’m considering having new windows installed. I’m going to look for a good company that can install some energy-efficient windows for me.

    Reply
  3. Alice Carroll

    You made a great point about how windows that help with insulation keep the warmth or the coolness inside the house better depending on the season. I think getting some of my windows replaced with energy-efficient ones can be beneficial for the coming summer. Maybe I could even see a noticeable decrease in my electric bills because it would lessen the amount of work my AC.

    Reply
  4. Dean Phillips

    I thought it was interesting how the article talked about how energy efficient windows take care of the issue of condensation and frost leading to mold and mildew. My wife has been wanting to replace all of the windows in our home because she feels they do not currently keep in warm or cold temperatures. It would be great for us to find a company that can give us advice on the windows that would best fit our needs.

    Reply
  5. Sariah Meagle

    Hopefully, we’ll be able to replace our windows with energy-efficient ones so we can save on costs. Since it reduces the requirements for a heating and cooling system, we might have a safer house. I agree that they will improve lighting which should hopefully beautify our rooms so I’ll consider it.

    Reply
  6. Dave Anderson

    It would be nice to have increased comfort in the home. Maybe I should get some energy efficient windows. That is something I will have to look into.

    Reply
  7. Kyle Winters

    It can really shock people to see just how many benefits energy efficient windows can provide for a home. In particular, I am glad that the article went over the increased level of comfort that they can provide. After all, energy efficient windows are much better at keeping your heating and air conditioning in during the hot and cold months.

    Reply