What Are Energy Efficient Windows?
Energy efficient windows are designed to prevent your heated or cooled air escaping from your home. Their increased insulation reduces your home’s energy usage—and therefore, your bills!—while also making your home more comfortable overall.
The Benefits of Efficient Windows
Customers who install Energy Star windows save an average of 12 percent on their utility costs throughout the year. That means a customer who spends $200 a month or $2400 a year would save $24 a month—or roughly $288 a year. Your savings could be even greater depending on which windows you’re replacing and the climate of your area. In fact, Energy Star studies show that replacing single pane windows with double pane can save between 21% and 31% off of heating and cooling costs.
Enjoy Some Peace and Quiet
The same insulating qualities that prevent heat loss in energy efficient windows also help keep sound out, so your home will be more quiet overall. This is good news if you live in a busy neighborhood with barking dogs, lots of traffic, nearby trains, or any other source of regular noise.
Double and Triple Pane Windows
Double and triple pane windows are made up of multiple sheets of glass sandwiched together with spacers. These multi-layer constructions create air pockets between the layers of glass, which are sealed shut to prevent any air from entering or escaping. Finally, they’re filled with different gases to increase their efficiency.
Multi-pane windows are very effective at insulating homes and are a major improvement over single-pane windows, although they’re more expensive than single pane windows. Still, upgrading your windows is one of the most effective ways to increase your home’s insulation, so the extra price is a wise long-term investment.
Low-e or low-emissivity coatings are an effective way to keep heat inside your home in the winter or to keep it out of your home in the summer. These coatings are designed to control the way the heat energy from sunlight moves around. An exterior low-e coating can prohibit the ultraviolet and the infrared light—in other words, the heat—from entering your home while still allowing the sunlight to pass through.
In northern climates when heat gain is more desirable, a low-e coating is often used in the reverse. The full spectrum of light is allowed into the home as much as possible, but the heat energy it produces is trapped inside. This creates a powerful greenhouse effect that keeps a home extra warm during the coldest months of the year.
Pay Attention to the VT Rating
The VT (visible transmittance) rating of a window shows how much visible light can pass through the windows. For windows on a darker room, like a home theater, the VT rating should be low, but for brighter spaces, like your kitchen windows, you’ll want to avoid low VT levels.
Low-e coatings are slightly tinted and when you get several of them—or other special glass treatments—you can actually block quite a bit of light from your home overall. The added layers of glass, even when they are clear, can block out quite a bit of light. This adds up and you will ultimately lose a lot of free visible light, requiring you to rely on electric lights more often during the day.
Look for the ENERGY STAR Logo
One of the quickest and easiest ways to find energy-efficient windows is to look for the Energy Star logo. Energy Star windows are highly efficient and need to meet a variety of standards and restrictions in order to earn the badge.
- Energy Star windows for northern climates are designed to let in infrared light that causes heat generation, so they trap warm air inside your home. These windows are double or triple paned, and their low U-factor proves their insulating capabilities.
- Energy Star windows for southern climates are made to keep heat out of the home. Their low U-factor also proves their insulation value, making them a highly efficient choice for warmer climates.
Not All Energy Star Windows are the Same
Looking for the logo is a good way to find efficient windows, but you should compare different options to decide which is the best value overall. Some will be more efficient than others. Some will have more durable construction, and others will be made from more aesthetically pleasing materials.
The Energy Star Credit
An Energy Star tax credit was available to anyone installing Energy Star windows in their homes for up to $200 each, and a maximum of $500 overall, available up until 2014. Now that credit has expired, but other local incentives are still available. For instance, customers in West Oregon, Colorado Springs, Fort Collins and a range of other locations all qualify for a mail-in rebate program when purchasing the right type of energy efficient windows. There are also some locations that offer low-interest loans to utility customers installing efficient windows. Check with your local installers and distributors to find out about available incentives and rebates.
Find a Reputable Manufacturer
When shopping for efficient windows, it’s important to look for quality manufacturers to find the best window brands. To find good quality providers, pay attention to customer ratings, look at the products in person to get an idea of build quality, and seek the advice of professionals to help you decide.
Pair an Efficient Window with an Efficient Frame
Installing an energy-efficient window is necessary for saving energy, but it won’t do you much good if the window frame isn’t efficient as well. Generally, aluminum windows are the least efficient, even when they have a thermal break in them. These windows simply conduct heat too well to be very efficient.
When searching for an efficient frame, there are four options available including composite, wood, vinyl, and fiberglass. Each frame type has advantages and disadvantages, so do your research to find out which frame will work best for you.
Rely on a Quality Installer
Energy efficient windows are only a good investment when they are installed properly, so take the time to find a reputable installation technician. Do your research by reading reviews and talking with potential installers before hiring—and always get an estimate before you move forward with a job. And finally, make sure that the installer handles the type of windows that you want on your home. Some manufacturers will include installation, and all installers should offer some type of warranty on their work.
Quality energy efficient windows can save you quite a bit of money over time by decreasing your home’s energy output and lowering your monthly expenses. They’ll also give you superior performance for decades and increase your home’s value overall. Best of all, they’ll be offsetting your carbon footprint, which means that by choosing energy efficient windows, you’re living a more eco-friendly lifestyle. Going green has never been so appealing!