Best Energy-Efficient Windows for Your Home

At Demers Glass, we’ve been helping Arizona homeowners find the right glass solutions since 1977. Whether you're building a new home or upgrading your existing windows, choosing energy-efficient options can dramatically enhance comfort, cut energy bills, and boost your home's value. In this guide, we’ll walk you through everything you need to know—clearly, professionally, and with your best interest in mind.

According to the U.S. Department of Energy, heat gain and loss through windows are responsible for 25%–30% of residential heating and cooling energy use.

By upgrading to energy-efficient windows, you can:

• Reduce heating and cooling costs
• Increase indoor comfort
• Minimize drafts and condensation
• Lower your carbon footprint

Want to understand your options better? You’re in the right place.

When shopping for energy-efficient windows, look for key ratings that indicate performance. Here’s what to watch for:

• U-Factor: This measures how well a window insulates. Lower numbers (typically between 0.20 and 1.20) indicate better performance.
• Solar Heat Gain Coefficient (SHGC): This tells you how much solar radiation is admitted. Lower values (0.25–0.80) mean less heat comes in—ideal for hot climates.
• Visible Transmittance (VT): This shows how much light enters your home. A higher number (closer to 1.00) means more natural light.
• Air Leakage: Lower air leakage rates prevent drafts.
• ENERGY STAR® Certification: This label signifies compliance with the U.S. EPA’s energy efficiency standards for specific climate zones.

These values are typically found on the National Fenestration Rating Council (NFRC) label. Learn more from the Department of Energy.

For homeowners in Arizona, where cooling costs can skyrocket in summer, choosing windows with a low SHGC and low U-Factor is crucial.

Not all window frames are created equal. The frame impacts not only the aesthetics and cost but also the energy performance.

Here are the most common types:

• Vinyl: Affordable and energy-efficient, vinyl frames resist heat transfer and require little maintenance.
• Wood: Offers natural insulation and a classic look but needs upkeep in hot or humid climates.
• Fiberglass: Durable and extremely energy-efficient. A bit more costly but worth the investment.
• Aluminum: Strong and affordable, but less insulating. Thermal breaks are essential for efficiency.

According to Pella, fiberglass and vinyl are top performers in energy savings.Explore our in-depth comparison of Pella vs Andersen Windows to determine which brand aligns with your needs.

Glass technology has advanced dramatically in recent years. Today’s energy-efficient windows feature multiple panes, special coatings, and gas fills designed to reduce heat transfer and block UV rays.

Key glass features include:

• Double or Triple Glazing: Two or three panes create layers of insulation. Triple glazing offers the best performance.
• Low-E Coatings: Thin metallic layers reflect heat while allowing light in, maintaining year-round comfort.
• Gas Fills: Inert gases like argon or krypton between panes boost insulation compared to standard air.
• Warm Edge Spacers: These separate the panes and reduce heat loss around the edge of the glass.

Learn more about insulated glass to understand why these technologies make a big difference.

Energy-efficient windows must match your regional climate. In Arizona’s desert heat, managing solar gain is essential.

Here’s what to look for:

• Low SHGC to block unwanted heat
• Low U-Factor for insulation against extreme temperatures
• UV Protection to reduce fading of furniture and flooring

According to Energy Saver, selecting windows with these features is key for warm climates like ours.Check out our guide to windows for cold climates if you’re in a mountain or high-altitude part of the state.

Window style affects airflow, sealing, and sunlight. Here’s a breakdown of popular options:

• Casement Windows: Hinged at the side and open outward. When closed, they provide an airtight seal.
• Awning Windows: Hinged at the top and open outward. Great for ventilation even during light rain.
• Double-Hung Windows: Traditional and easy to clean but may have more air leakage.
• Sliding Windows: Easy to operate but generally less efficient than hinged models.
• Picture or Fixed Windows: Do not open—offering top-notch efficiency.

Andersen Windows highlights casement styles as a top choice for energy performance.Still unsure? Our article on single vs double-hung windows offers helpful insight.

Even the best window can underperform if it’s not installed correctly. Gaps, misalignments, and poor seals all contribute to energy loss.

Here’s what to expect from a quality installation:

• Accurate measurements
• Proper sealing and insulation
• Alignment and secure fastening
• Professional finishing

We always recommend hiring certified installers. Demers Glass has specialized in expert installations since 1977, ensuring every window performs as promised. Learn more about whole-house window replacement.

Aside from the windows themselves, additional upgrades can enhance efficiency and comfort.

• Insulated Curtains: Trap heat in winter and block sunlight in summer.
• Window Tinting: Reduces glare, solar heat, and UV rays. Learn more in our window tinting guide.
• Window Films: Applied directly to glass to boost insulation.
• Weatherstripping: Prevents drafts and reduces energy loss.

How long do energy-efficient windows last?
High-quality windows can last 20–30 years with proper care. Materials like fiberglass and vinyl offer the longest lifespans.

Are energy-efficient windows worth the cost?
Absolutely. While the initial investment is higher, long-term energy savings and comfort easily offset the price over time.

Can I replace just one or two windows?
Yes—but consistency matters. Mixing old and new may create uneven performance. A full upgrade ensures optimal results.

Investing in energy-efficient windows is one of the best decisions you can make for your home. From boosting indoor comfort to saving on utility bills, the benefits are undeniable.

At Demers Glass, we’re proud to provide Arizona homeowners with expert guidance, premium products, and unmatched installation service. We’ve been putting customers first for nearly 50 years—and we’re just getting started.

For personalized recommendations, or to schedule a consultation, contact us today.

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