Yes, Marvin Elevate windows are ENERGY STAR rated when configured with the appropriate glazing package for your climate zone. Marvin is an ENERGY STAR partner, and the company meets ENERGY STAR Most Efficient criteria with over 40 product types and more than 27,000 glazing options across its collections, according to Marvin’s official product performance documentation. The Elevate collection specifically features Ultrex fiberglass exteriors paired with natural wood interiors, and the available Low-E glass configurations produce U-factor and SHGC (Solar Heat Gain Coefficient) values that meet ENERGY STAR requirements in all four U.S. climate zones.

This guide explains what ENERGY STAR certification means for windows, how the Marvin Elevate collection achieves it, what glazing options are available, how to verify certification on a specific window, whether Elevate windows qualify for federal tax credits, and how other collections like Marvin Essential and Milgard compare on ENERGY STAR performance.

Are Marvin Elevate Windows Energy Star Rated

Marvin Elevate windows are ENERGY STAR rated across multiple window styles when paired with the right insulating glass package. ENERGY STAR certification for windows is not a blanket rating applied to an entire product line. It depends on the specific combination of frame material, glass type, Low-E coating, gas fill, and spacer system installed in each unit. Marvin publishes NFRC-certified energy performance data for every Elevate window configuration, and many of those configurations meet or exceed ENERGY STAR criteria for their applicable climate zone.

For example, a Marvin Elevate double-hung window with standard Low-E2 insulating glass achieves a U-factor of approximately 0.29 and an SHGC of 0.31, according to data compiled from the ENERGY STAR certified products database and referenced by Green Building Advisor. A Marvin Elevate picture window with the same glazing achieves a U-factor of approximately 0.30 and an SHGC of 0.33. Both values fall within the ENERGY STAR-certified range for the Northern and North-Central climate zones, which cover most of the United States including Oregon.

The Elevate collection is available in multiple window styles, each carrying its own NFRC-tested performance values because the frame-to-glass ratio and sash design affect thermal performance differently across window types. Available Elevate window styles include:

• Casement windows, which use a compression seal for strong air tightness and pair well with Low-E2 or Low-E3 glazing for year-round performance.
• Double-hung windows, the most popular residential window style, with tilt-in sashes for easy cleaning and ENERGY STAR-certified glazing options for all climate zones.
• Awning windows, ideal for high-wall placements in bathrooms and kitchens where ventilation during rain is a priority.
• Glider (sliding) windows, which provide wide views and smooth horizontal operation for kitchens, living rooms, and basement spaces.
• Picture and direct-glaze windows, which are fixed units that deliver the lowest U-factor values because they have no moving parts and no air leakage pathways.
• Specialty shapes, including round-top, trapezoid, and custom geometric configurations for architectural accent openings.

Builders and homeowners selecting Marvin Elevate windows should confirm the specific glazing configuration meets ENERGY STAR criteria for their climate zone before ordering, which any authorized Marvin dealer can verify.

What Makes a Window ENERGY STAR Certified

A window is ENERGY STAR certified when it meets the U-factor and SHGC requirements established by the U.S. Environmental Protection Agency (EPA) for the climate zone where it will be installed. The National Fenestration Rating Council (NFRC) independently tests and certifies the energy performance of every window that carries an ENERGY STAR label. The NFRC label on the window displays the tested U-factor, SHGC, Visible Transmittance (VT), and optional air leakage rating, and the ENERGY STAR logo appears alongside the NFRC label when the product meets the program’s criteria.

ENERGY STAR divides the United States into four climate zones: Northern, North-Central, South-Central, and Southern. Each zone has different U-factor and SHGC thresholds because energy efficiency priorities differ by climate. In the Northern zone, where heating costs dominate, a low U-factor (strong insulation against heat loss) is the priority. In the Southern zone, where cooling costs dominate, a low SHGC (blocking solar heat gain) is the priority. Windows must be manufactured by an ENERGY STAR partner, independently tested by an NFRC-accredited laboratory, and verified to meet the zone-specific criteria before they can display the ENERGY STAR label.

According to the U.S. Department of Energy, windows account for 25 to 30 percent of residential heating and cooling energy use. The EPA’s ENERGY STAR program reports that installing ENERGY STAR certified windows can reduce heating and cooling costs by an average of up to 13 percent nationwide compared to non-certified products. The certification program exists to help homeowners identify windows that deliver measurable energy savings in their specific climate.

What Is a U-Factor and Why Does It Matter for Window Selection

U-factor measures how well a window prevents heat from escaping through the glass and frame. Lower U-factor values indicate better insulating performance. A U-factor of 0.30 or below is considered strong performance for residential windows, according to Marvin’s energy efficiency guidelines. In the ENERGY STAR Northern zone, windows must achieve a U-factor of 0.22 or lower to meet the baseline criteria, though equivalent performance pathways allow U-factors up to 0.30 when paired with higher SHGC values that offset heating costs through passive solar gain.

U-factor is measured for the entire window assembly, including the glass, frame, spacer, and any gas fill between panes. This whole-window measurement matters because a high-performance glass pane can be undermined by a thermally conductive frame material. The Marvin Elevate collection addresses this by pairing Ultrex fiberglass exteriors with wood interiors. Ultrex fiberglass has low thermal conductivity, which means the frame itself does not act as a bridge for heat to escape. Wood interiors provide natural insulation on the room side. The combination of thermally efficient frame materials and Low-E insulating glass is what allows Elevate windows to achieve the U-factor values that qualify for ENERGY STAR certification.

What Is SHGC and How Does It Affect Your Window Choice

SHGC (Solar Heat Gain Coefficient) measures how much solar radiation passes through a window and enters the home as heat. SHGC values range from 0 to 1. A lower SHGC means less solar heat enters the home, which reduces cooling costs in warm climates. A higher SHGC allows more solar heat in, which can reduce heating costs in cold climates by harnessing passive solar energy during winter months.

The right SHGC depends on your climate zone, the orientation of the window, and the home’s heating and cooling balance. In the ENERGY STAR Southern zone, the maximum SHGC is 0.23 because blocking solar heat is the top priority. In the Northern zone, SHGC requirements are more flexible because allowing some solar heat gain actually benefits homeowners who spend more on heating than cooling. Marvin Elevate windows with Low-E1 glazing allow higher solar heat gain for Northern climates, while Low-E3 glazing blocks more solar heat for warmer regions. Selecting the right Low-E glass coating for your climate zone is one of the most important decisions in any window project.

What ENERGY STAR Climate Zone Is Oregon In

Oregon falls in the ENERGY STAR Northern climate zone, which has the strictest U-factor requirements in the program. The Northern zone covers states where winter heating is the dominant energy expense, including Oregon, Washington, Idaho, Montana, Minnesota, Wisconsin, Michigan, and the northern portions of many other states. For homes in Central Oregon, where winter temperatures regularly drop below freezing and snow is common from November through March, the Northern zone classification means U-factor performance is the most important energy metric when selecting windows.

ENERGY STAR Northern zone requirements for windows, effective since October 2023 under Version 7 of the program, require a U-factor of 0.22 or lower at the baseline level. However, the program allows equivalent performance pathways that accept higher U-factor values when the SHGC is also higher. For example, a window with a U-factor of 0.29 qualifies in the Northern zone if its SHGC is 0.37 or higher, because the additional passive solar heat gain compensates for the slightly lower insulating value. The Marvin Elevate double-hung with standard Low-E2 glazing achieves a U-factor of 0.29 and an SHGC of 0.31, which meets the Northern zone equivalent performance criteria.

For builders and homeowners selecting premium windows for projects in the region, understanding the Northern zone requirements helps narrow the glazing options. Builders in Bend and the surrounding communities benefit from working with a Marvin dealer who can match the specific Elevate glazing configuration to the project’s location, window orientation, and energy goals.

What Glazing Options Are Available for Marvin Elevate Windows

Marvin offers four primary Low-E glazing options across its collections, including the Elevate line. Each glazing option targets a different climate and energy performance goal. The four options are Low-E1, Low-E2, Low-E3, and Low-E3 with ERS (Enhanced Room Side) coating.

Glazing Option	Best Climate Zone	Solar Heat Gain	Energy Performance
Low-E1	Northern	High (allows passive solar heating)	Low U-factor; maximizes winter solar gain to reduce heating costs
Low-E2	Northern, North-Central, South-Central	Medium (balanced year-round)	Low U-factor; medium SHGC for year-round comfort in mixed climates
Low-E3	South-Central, Southern	Low (blocks solar heat)	70% more efficient in summer, 49% more efficient in winter vs standard glass
Low-E3/ERS	All zones (maximum efficiency)	Low (blocks solar heat + reflects room-side heat)	Maximum year-round thermal performance; similar SHGC to Low-E3 with additional interior heat reflection

Sources: Marvin energy efficiency documentation, Marvin Replacement performance data. Summer and winter efficiency percentages are relative to standard uncoated glass. Exact U-factor and SHGC values vary by window style and size.

Low-E1 features a single metallic coating layer that allows more solar heat through the glass, which benefits homes in cold climates where passive solar heating offsets furnace use during winter. Low-E2 features a double layer of silver coating that provides balanced performance across seasons, making it the most versatile option for regions that experience both cold winters and warm summers. Low-E3 features an advanced coating that blocks solar heat aggressively, which is ideal for Southern and South-Central climates where cooling costs dominate. Marvin Replacement data shows that Low-E3 glass is 70 percent more efficient in summer and 49 percent more energy efficient in winter compared to standard uncoated glass.

Low-E3/ERS adds an Enhanced Room Side coating to the interior surface of the glass. This additional coating reflects interior heat back into the room, which improves winter performance beyond what Low-E3 alone achieves. The ERS coating maintains a similar SHGC to standard Low-E3 but provides a cooler interior glass surface in winter because the heat is reflected rather than absorbed by the glass. This cooler surface may produce slightly more condensation in very cold climates, which is worth noting for projects in areas with extreme winter conditions.

How Does the Ultrex Fiberglass Exterior Improve Energy Efficiency

The Ultrex fiberglass exterior on Marvin Elevate windows improves energy efficiency by minimizing thermal bridging through the frame. Thermal bridging occurs when a frame material conducts heat from the warm interior of a home to the cold exterior, bypassing the insulating value of the glass. Ultrex fiberglass has significantly lower thermal conductivity than aluminum and lower thermal expansion than vinyl, which means the frame resists heat transfer and maintains a consistent seal between the sash and the frame across temperature changes.

Ultrex fiberglass is a proprietary pultruded fiberglass composite developed by Marvin. The pultrusion manufacturing process aligns glass fibers in a resin matrix to create a material that is eight times stronger than vinyl, according to Marvin. This strength-to-weight advantage allows Marvin to build thinner frame profiles on Elevate windows without sacrificing structural integrity. Thinner frames mean more glass area per window unit, which increases natural light and visible transmittance while reducing the overall frame-to-glass ratio. A lower frame-to-glass ratio generally improves the whole-window U-factor because glass with Low-E coatings and gas fill insulates better per square inch than frame material does.

The dimensional stability of Ultrex fiberglass also extends the life of the window’s weatherstripping and seals. Vinyl frames expand and contract with temperature changes, which gradually loosens the seal between the sash and frame over years of thermal cycling. Fiberglass frames experience minimal thermal expansion, so the compression seal stays tight longer. Builders selecting Marvin windows for projects where long-term energy performance matters benefit from this dimensional stability in every Elevate unit installed.

What Is the Difference Between Marvin Ultimate and Elevate Windows

The difference between Marvin Ultimate and Elevate windows is primarily in the exterior cladding material and the level of design customization available. Both collections feature natural wood interiors and both offer ENERGY STAR-certified glazing options. The Ultimate collection uses extruded aluminum cladding on the exterior, while the Elevate collection uses Ultrex fiberglass on the exterior. Both cladding materials protect the wood interior from weather, but they differ in thermal performance, finish options, and price positioning.

Aluminum-clad exteriors on the Ultimate collection offer the widest range of exterior paint colors and the most design flexibility, including custom sizes, specialty shapes, and architectural details that are not available in the Elevate line. The Elevate collection offers a strong selection of standard sizes, colors, and window types at a lower price point than Ultimate. For energy performance specifically, the Ultrex fiberglass exterior on Elevate windows provides better thermal insulation than the aluminum exterior on Ultimate windows because fiberglass conducts less heat than aluminum. Both collections can be configured with the same Low-E glazing options and gas fills, so the glass performance is equivalent when the same glazing is specified.

Homeowners who want the broadest design flexibility and are willing to invest in premium customization choose Ultimate. Homeowners and builders who want strong energy performance, a natural wood interior, and a durable fiberglass exterior at a more accessible price point choose Elevate. Both collections meet ENERGY STAR criteria when configured with the appropriate glazing for the climate zone. We carry both at our showroom, and our team can help you compare the two collections side by side for your specific project.

Do Marvin Elevate Windows Qualify for Tax Credits

Marvin does not participate in the federal Energy Efficient Home Improvement Tax Credit program as of 2025. This means Marvin windows, including the Elevate collection, do not carry the manufacturer certification statements required to claim the federal tax credit of up to $600 for ENERGY STAR Most Efficient windows through 2032. Marvin’s energy efficiency page confirms this directly and encourages customers to check for local rebates using the ENERGY STAR Rebate Finder.

The federal tax credit requires windows to meet ENERGY STAR Most Efficient criteria, which is a higher standard than standard ENERGY STAR certification. The Most Efficient designation requires a U-factor of 0.20 or lower and an SHGC of 0.25 or lower. These values are stricter than the standard ENERGY STAR zone requirements, and meeting them requires specific triple-pane or high-performance glazing configurations. While some Marvin glazing options may achieve these values, Marvin has chosen not to participate in the federal certification program that enables the tax credit.

Homeowners who want to claim the federal window tax credit should consider Milgard windows, which do participate in the program and provide manufacturer certification statements for tax years 2023 through 2032. We carry both Marvin and Milgard, so homeowners who prioritize the tax credit can explore Milgard’s ENERGY STAR Most Efficient options while homeowners who prioritize the Elevate collection’s wood interior and Ultrex fiberglass exterior can still benefit from ENERGY STAR-level energy savings and potential local rebates.

Are Milgard Windows Energy Star Rated

Yes, Milgard windows are ENERGY STAR rated. Milgard is an ENERGY STAR partner that conducts thermal simulations and adheres to ENERGY STAR requirements across its product lines. Milgard’s vinyl and fiberglass insulated windows have been recognized by ENERGY STAR for their energy performance, and the company provides ENERGY STAR certification across multiple window styles and frame materials for all four U.S. climate zones.

Milgard also participates in the federal tax credit program and offers manufacturer certification statements for tax years 2023 through 2032. Homeowners who install Milgard windows that meet the ENERGY STAR Most Efficient criteria can claim up to $600 in federal tax credits for windows and up to $500 for patio doors. Milgard’s SunCoat Low-E glass reduces harmful UV rays by up to 78 percent while maintaining visible light transmission, according to Milgard’s published product data. We carry a full range of window collections from Milgard, including the Tuscany, Trinsic, Styleline, and Ultra series, all of which offer ENERGY STAR-certified configurations.

Are Marvin Essential Windows Energy Star Rated

Yes, Marvin Essential windows are ENERGY STAR rated when configured with the appropriate glazing package. The Essential collection features Ultrex fiberglass on both the interior and exterior, which provides a streamlined, low-maintenance design with strong thermal performance throughout the frame. A Marvin Essential double-hung window with standard glazing achieves a U-factor of approximately 0.30 and an SHGC of 0.33, according to data from the ENERGY STAR certified products database.

The all-fiberglass construction of the Essential collection eliminates wood from the interior, which reduces maintenance requirements and simplifies the frame’s interaction with moisture. For homeowners who prefer the clean look of a fiberglass interior over a natural wood interior, Essential provides ENERGY STAR-level energy performance at a lower price point than the Elevate collection. The same Low-E glazing options available for Elevate are available for Essential, so the glass performance can be matched to the climate zone just as precisely. Builders working on projects that call for energy-efficient windows with minimal ongoing maintenance often specify Marvin Essential for those reasons.

How Do You Know If Your Windows Are ENERGY STAR Rated

You know if your windows are ENERGY STAR rated by looking for the ENERGY STAR logo on the NFRC label attached to the window. Every window that meets ENERGY STAR criteria carries both an NFRC label (with the tested U-factor, SHGC, VT, and optional air leakage values) and the ENERGY STAR logo indicating which climate zones the window qualifies for. The labels are typically affixed to the glass surface or the frame of new windows and can be found in the manufacturer’s product documentation for installed windows.

To verify ENERGY STAR certification on a specific window after the label has been removed, follow these steps:

1. Locate the NFRC Certified Products Directory (CPD) number on the window. This number is often etched or stamped on the spacer bar between the glass panes or printed on a label on the window frame.
2. Visit the NFRC Certified Product Directory online and search for the CPD number.
3. Review the results. If the ENERGY STAR field for your climate zone is marked as certified (shown as green in the directory), the window meets ENERGY STAR requirements for that zone.
4. For tax credit verification, confirm that the window also meets ENERGY STAR Most Efficient criteria (U-factor of 0.20 or lower, SHGC of 0.25 or lower) and that the manufacturer provides a qualifying certification statement.

If you are purchasing new windows and want ENERGY STAR certification, request the NFRC-tested performance data and ENERGY STAR certification status from your dealer or builder before ordering. Any reputable dealer can provide this information for the specific window style, size, and glazing configuration you are considering.

Frequently Asked Questions

Are New Windows Tax Deductible in 2026

New windows are eligible for a federal tax credit (not a deduction) if they meet ENERGY STAR Most Efficient certification requirements. The Energy Efficient Home Improvement Tax Credit allows homeowners to claim 30 percent of the product cost, up to $600 total for windows and skylights, for qualifying products installed through December 31, 2032, according to the IRS. The credit is available annually, and the windows must be installed in the homeowner’s primary residence. Manufacturers that participate in the program provide certification statements with the required Qualified Manufacturer Identification Number (QMID) for the tax return.

Which Marvin Collection Fits Your Project Best

The best Marvin collection for your project depends on the balance of design flexibility, materials, energy performance, and budget that fits your goals. The Ultimate collection offers the widest customization with aluminum-clad wood windows. The Elevate collection provides Ultrex fiberglass exteriors with wood interiors at a more accessible price. The Essential collection uses all-fiberglass construction for the lowest maintenance. The Modern collection delivers contemporary large-format designs. The Vivid collection offers dramatic sizes in a fiberglass frame for transitional to contemporary architecture. All collections offer ENERGY STAR-certified glazing options.

What Are the Signs That Windows Need to Be Replaced

The signs that windows need to be replaced include visible condensation or fogging between the glass panes (indicating a failed insulated glass seal), drafts felt near the window even when closed (indicating failed weatherstripping or warped frames), difficulty opening or closing the window (indicating frame warping or balance system failure), visible rot or decay on wood frames, increased energy bills without other explanation, and excessive outside noise penetrating through the window. A 2025 This Old House survey found that 67 percent of homeowners who replaced their windows saved between $25 and $100 per month on energy bills, confirming that replacement delivers measurable savings when existing windows show these signs of failure.

How Much Can ENERGY STAR Windows Save on Energy Bills

ENERGY STAR windows can save homeowners an average of up to 13 percent on heating and cooling costs nationwide compared to non-certified products, according to the EPA’s ENERGY STAR program. The actual savings depend on the climate zone, the condition of the existing windows being replaced, the home’s size and insulation, local energy rates, and the specific performance of the new windows. Replacing single-pane windows with ENERGY STAR certified double-pane windows with Low-E coatings and argon gas fill produces the largest savings. Replacing already-efficient double-pane windows produces smaller but still meaningful improvements.

Does ENERGY STAR Certification Mean a Window Will Pass Local Building Code

ENERGY STAR certification does not guarantee that a window will pass local building code inspection. ENERGY STAR is a voluntary program that sets energy efficiency standards, while building codes are mandatory requirements that vary by state, county, and municipality. In many cases, ENERGY STAR requirements are more stringent than local building codes, so an ENERGY STAR-certified window will typically exceed code minimums. However, local codes may include additional requirements beyond energy performance, such as structural ratings, impact resistance, and egress compliance. Always confirm with your local building department that the specific window you are installing meets all applicable code requirements for your project.

The Bottom Line

Marvin Elevate windows are ENERGY STAR rated when configured with the right glazing for your climate zone, and they deliver strong energy performance through the combination of Ultrex fiberglass exteriors, natural wood interiors, and advanced Low-E insulating glass options. The Elevate collection gives builders and homeowners a window that looks beautiful on the inside, performs reliably on the outside, and meets the energy efficiency standards that matter most in cold-climate regions like ours. For homeowners who also want access to federal tax credits, Milgard windows offer ENERGY STAR Most Efficient options with full tax credit certification.

If you want help selecting the right Marvin Elevate, Marvin Essential, or Milgard windows for your project, reach out to the team at Lifetime Building Supply. We carry all three lines and can match the glazing, frame, and performance specifications to your home, your climate, and your goals. Call us at 541-395-6808 to schedule a consultation.