Energy-Efficient Windows: A Complete Buyer's Guide

Energy-Efficient Windows: A Complete Buyer’s Guide

Picture of Stew Broward
Stew Broward
3
min read
Share
Share
Upgrading to energy-efficient windows is a great way to make your home more comfortable and save on energy bills. The right windows keep your home warm in the winter, cool in the summer, and even increase its value.
 
But with so many options like double-pane, triple-pane, and Low-E glass, it can be tough to choose. This guide will break it all down, compare the benefits, and help you find the best fit.
And if you need expert installation, feel free to reach out!

What Are Energy-Efficient Windows?

Energy-efficient windows are made to keep heat in or out, improve insulation, and let in more natural light while reducing energy waste. They usually have special features like Low-E glass coatings, gas-filled spaces, and insulated frames to work better.

Why Energy-Efficient Windows Matter

Traditional windows let up to 30% of heat escape from your home, driving up energy bills and putting extra strain on your HVAC system. On the other hand, energy-efficient windows are made to:
 
  1. Save money. Energy-efficient windows lower your energy bills by reducing the need for constant heating and cooling.
  2. Improve comfort. They keep your home’s temperature steady by blocking drafts and cutting heat loss in the winter or heat gain in the summer.
  3. Let in natural light. These windows let in lots of natural light and block harmful UV rays.
  4. Cut condensation. They help reduce condensation, preventing mold growth and damage to your window frames.
  5. Protect valuable items in your home. Low-E coatings protect your furniture, artwork, and flooring from UV rays that cause fading.
  6. Block inside/outside noise. Multi-pane windows block outside noise and make your home quieter.
 
Plus, many states and utility companies offer tax credits, rebates, and other incentives, so it becomes even more worthwhile to invest in energy-efficient windows. But you need to make sure that the chosen windows actually do their job.

How Do I Know If a Window is Energy Efficient?

Energy-efficient windows are rated by a few key factors like R-value, U-factor, and Solar Heat Gain Coefficient (SHGC). To make sure you’re getting good quality and performance, look for certifications from trusted groups like ENERGY STAR and the National Fenestration Rating Council (NFRC). Also, look for windows that have all essential efficiency features.

Key Features of Energy-Efficient Windows

If you’re on your way to window shopping, these are the key features to look for:
 
  • Low-E coatings. These special coatings reflect heat to keep your home warm in winter and cool in summer and still let in natural light.
  • Insulated frames. Energy-efficient windows have frames filled with materials that keep the temperature inside your home steady. They do so by reducing heat transfer.
  • Multiple panes of glass. Double- or triple-pane windows have air- or gas-filled spaces between them to act as extra insulation.
  • Gas fills. Some windows are filled with gases like argon or krypton between the panes, which further cuts heat transfer.
  • Better seals. Energy-efficient windows have strong seals to prevent drafts, moisture, and air leaks.
  • UV protection. This blocks harmful UV rays from penetrating your home.
  • Noise reduction. Look for energy-efficient windows that also block outside noise and keep your home more peaceful.

What are Window R-Values?

The R-value of a window measures how well it resists heat flow, or basically, how good it is at keeping heat in or out. It’s the opposite of the U-factor, which tells you how easily heat can pass through a window (a lower U-factor is better).
 
So, while the U-factor shows how much heat can get through, the R-value shows how well the window keeps heat from passing through. Higher R-values are better for insulation.

Why Is It Important?

The R-value of a window plays a big role in how comfortable and energy-efficient your home is. Besides, using less energy to heat or cool your home, windows with high R-values cut your carbon footprint and support a more eco-friendly lifestyle.
 
And since your home becomes more energy efficient, it gets more attractive to potential buyers if you decide to sell.

Factors That Affect Window R-Values

Several things affect how well a window insulates:
 
  1. The kind of glass used in a window can make a big difference in its R-value. Some options include:
    • Double-pane glass traps air between two panes of glass for moderate insulation.
    • Triple-pane glass adds an extra layer of insulation with three panes and two air-filled spaces for even better insulation.
    • Low-E coatings, or thin metallic layers on the glass, reflect heat and let light in.
  2. The space between window panes can be filled with gases (gas fills) like argon or krypton. These gases reduce heat transfer and improve the R-value:
    • Argon is a more affordable option, great for double- and triple-pane windows.
    • Krypton is more expensive, but it provides better insulation, especially for narrow spaces between panes.
  3. The material of the window frame also affects its R-value. Common frame types include:
    • Vinyl: cost-effective and energy efficient.
    • Wood: good insulation, but needs more maintenance.
    • Aluminum: strong and durable, but needs a thermal break to improve insulation.
    • Fiberglass: offers both durability and great energy efficiency.
  4. Spacer technology and heat transfer are used to separate the glass panes in multi-pane windows. Newer spacers made from foam or rubber cut heat transfer at the edges of the window, which boosts the R-value.

Window Types and Parts

When you’re looking to upgrade to energy-efficient windows, there are many choices. Each type of window and its parts play a big role in making your home more comfortable and saving on energy bills.
 
Let’s break down the main window types, parts, and features to help you make the best decision.

Window Types

  • Single-hung windows. These windows have one movable pane, usually the bottom one, which slides up and down. They’re affordable but not the most energy-efficient since the top pane stays fixed and can let in drafts.
  • Double-hung windows. Double-hung windows are like single-hung windows, but both the top and bottom panes slide up and down. You get better airflow and insulation; that’s why they are more energy-efficient.
  • Sliding windows. These windows slide open horizontally (side to side). They’re easy to open and close and provide good ventilation. When paired with the right glass, sliding windows are energy-efficient, too.
  • Casement windows. Casement windows are hinged on the side and open out like a door. They’re great for energy efficiency because when they close, they form a tight seal, keeping drafts out.
  • Awning windows. These windows are hinged at the top and open outward. They’re useful in rainy weather because the window stays open while the rain is blocked. They’re also energy-efficient if you use the right type of glass.
  • Fixed windows. Fixed windows don’t open at all, but they’re great for letting in light and adding to the look of a room. Since they don’t have any moving parts, they can be sealed tightly for better insulation.
  • Skylights. Skylights are installed in the roof and let in a lot of natural light. To make sure they don’t let heat out, you’ll want to choose an energy-efficient option that’s well insulated.

Window Glazing

Glazing refers to how many layers of glass your window has. More layers usually mean better insulation and energy efficiency:
 
  • Single-panel windows. These windows have just one layer of glass. While they’re cheap, they’re not very energy efficient because they let a lot of heat escape in the winter and let cold air in during the summer.
  • Double-pane windows. Double-pane windows have two layers of glass with a gap in between that acts as insulation. These are the most common energy-efficient windows.
  • Triple-pane windows. Triple-pane windows have three layers of glass and two gaps filled with insulating gases. These are the best options for extreme climates since they provide the most insulation.
  • Low-E glass windows. Low-E glass is great for reducing energy costs and protecting furniture from fading due to UV rays.

Window Frames

The material of your window frame also affects its energy efficiency:
 
  1. Metal frames, like aluminum, are strong and durable but not the best at keeping heat in. They’re usually more expensive, but some have special coatings to improve insulation.
  2. Since wood is a natural insulator, wooden frames are great for energy efficiency. However, they need regular maintenance to keep them from rotting or getting damaged by water.
  3. Vinyl frames are affordable, low-maintenance, and provide good insulation. They’re a popular choice for homeowners looking for energy-efficient windows on a budget.
  4. Composite frames are made from a mix of materials, combining the benefits of wood and plastic. They offer good insulation, are low-maintenance, and are durable.

Gas Fills

Between the panes of glass in double or triple-pane windows, the space can be filled with special gases like argon or krypton. These gases are denser than air and reduce heat transfer, improving the window’s insulation.

Spacers

Spacers are the materials that separate the panes of glass in multi-pane windows. Modern spacers are made from materials like foam or rubber, which reduce heat transfer. They also prevent condensation from building up around the edges of the glass.

Window Replacement Options

When it’s time to update your windows, you have a few options. To choose the best, look at your current windows and your budget.
 
  1. Repair existing windows. If your windows are still in good shape, fixing any gaps and adding storm windows will make them more energy efficient.
  2. Retrofit windows. This means installing new glass panes into your existing window frames to improve performance without replacing the whole window.
  3. Insert windows. Here, new windows are installed into the old frames. The structure doesn’t change, but you get updated windows that work better.
  4. Full replacement windows. This is the most complete option, where both the window and the frame are replaced. It’s the best choice for maximum energy efficiency.
 
When choosing new windows, here are a few things to keep in mind:
 
  • Look for ENERGY STAR certification.
  • Check the U-factor. A lower U-factor means better insulation. The lower the U-factor, the better the window is at keeping heat in during winter and out during summer.
  • Consider solar heat gain coefficient (SHGC). For hot climates, look for windows with a lower SHGC to block out heat from the sun. In colder climates, a higher SHGC is better to let in some warmth from the sun.
  • If you live in a place with extreme temperatures, you might need special windows like triple-pane.
  • Balance the cost of new windows with how much energy savings you can expect. Cheaper options might save less on energy bills over time.
  • If you live in a noisy area, triple-pane windows will better reduce sound from outside.
 
If you’ve already purchased your best windows, let’s quickly talk about how to install them.

Installation Tips from the Experts at Boelter Is Better

Poor installation lowers your windows’ efficiency, so it’s important to have experts handle the job to make your windows work as they should. If you’re doing it yourself or just want to double-check:
 
  • Make sure there are no gaps around the frame. Air leaks let in drafts and waste energy. Use quality weatherstripping or caulk to seal any openings.
  • Insulating foam around the window frame will keep your home warm in winter and cool in summer.
  • A slightly off-center window can cause gaps over time. Use a level and secure it well to avoid warping.
  • Before adding trim or sealing everything up, open and close the window to make sure it operates as it should.

FAQs

How long do energy-efficient windows last?
With proper care, high-quality windows can last on average 20-30 years and up to 50 years.
Can energy-efficient windows eliminate condensation completely?
They reduce condensation but might not get rid of it completely.
Do energy-efficient windows need special maintenance?
You don’t need special care. Just regular cleaning and checking the frames now and then.
Are triple-pane windows worth the cost?
Yes, especially in extreme climates. They make your energy bills more appealing and keep your home cozier.
What’s the best frame material for energy efficiency?
Vinyl and fiberglass are the best balance of insulation, durability, and cost.

Final Thoughts

Upgrading to energy-efficient windows is a smart choice. It boosts your home’s coziness, save on energy, and increase the home’s value. When you’re ready to upgrade, the team at Boelter Is Better is here to help you find and install the perfect energy-efficient windows for your home.
Share
Schedule Your Free Call
Fill out this form to schedule a call with our manager.
Full name *(Required)
This field is for validation purposes and should be left unchanged.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Latest Posts