I once signed off on a bulk order of windows that looked great on paper but turned into a nightmare during installation.
The energy ratings didn’t hold up, and the cooling bills told the real story.
That mistake forced me to dig deeper into which suppliers could back up their claims with proven results.
Since then, I’ve worked through multiple B2B projects and compared manufacturers who consistently deliver real efficiency. What you’ll see here is built on that experience.
This article lays out 8 energy efficient window manufacturers worth evaluating or contacting so you don’t waste time or budget on the wrong supplier.
Let’s cut through the noise and find the right fit.
So let’s begin!
Quick Comparison Chart
Before diving deep into each manufacturer, here’s a quick snapshot to help you see the essentials at a glance. This way, you can spot who fits your project best before we unpack the details.
| Manufacturer | Year Founded | Location | Key Products | Limitation / Not Ideal For | Best For |
| Andersen Windows & Doors | 1903 | Bayport, Minnesota, USA | Wood-clad, fiberglass, vinyl windows | Not ideal for highly budget-restricted projects | Large-scale residential, premium villas |
| Pella Corporation | 1925 | Pella, Iowa, USA | Wood, vinyl, fiberglass windows | Limited global reach outside North America | Homes, hotels, regional B2B projects |
| Vallisco | 2024 (backed by Qeeka Home since 2007) | Shanghai, China | Thermal break aluminum, soundproof, insulated glass windows | Not ideal for single-window/door buyers | Villas, hotels, B&Bs, greenhouses |
| Marvin | 1912 | Warroad, Minnesota, USA | Wood-clad, fiberglass, all-fiberglass windows | Premium lines may be expensive for tight budgets | High-end homes, villas, commercial projects |
| Milgard Windows & Doors | 1958 | Tacoma, Washington, USA | Vinyl, aluminum windows | Aluminum frames less insulating than vinyl/fiberglass | Cost-conscious residential, multi-unit projects |
| JELD-WEN | 1960 | Charlotte, North Carolina, USA | Vinyl, wood, aluminum windows | Service quality can vary by retailer/distributor | Broad residential + commercial projects |
| Alpen High Performance Products | 1981 | Louisville, Colorado, USA | Fiberglass, triple-pane, Passive House-certified windows | Advanced glazing harder to source locally | Net-zero homes, green hotels, eco-certified builds |
| Internorm | 1931 | Linz, Austria | uPVC/aluminum, timber-aluminum, composite windows | Integrated blinds more complex to maintain | Energy-conscious European villas, hotels, commercial builds |
Now that you’ve seen the overview, let’s dig deeper into each manufacturer to uncover the details that matter most.
1. Andersen Windows & Doors
Andersen Windows & Doors was founded in 1903 in Bayport, Minnesota, and has grown into one of North America’s most recognized window manufacturers. With over a century of operations, the company has built a reputation for reliability and innovation.
Today, Andersen employs more than 12,000 people across multiple plants and offices. Its size gives it the capacity to support both residential and commercial projects of almost any scale.
The company is still headquartered in Minnesota but distributes widely across the United States and internationally. For many project managers, this reach means easier access to consistent supply and service.
Product Range
- Fibrex® Composite Windows: Made from recycled wood fiber and PVC, these frames offer higher insulation than standard vinyl. They are often chosen for villas and modern hotels.
- Casement Windows: Hinged on the side and opening outward, casement windows allow strong ventilation while maintaining tight seals for efficiency.
- Patio Doors: Sliding and hinged patio doors provide wide openings and are engineered with low-E glass for better thermal performance.
Research & Development (R&D)
- Fibrex Material Innovation: Developed in-house, this composite resists warping while improving insulation performance. It also uses recycled content for sustainability.
- Energy Testing Standards: Products are tested for U-factor (heat transfer) and SHGC (solar heat gain) to meet ENERGY STAR® qualifications.
- Design Flexibility: Andersen adapts frame designs and glazing packages to meet diverse climate demands, from hot regions to cold-weather builds.
Customer Support & After-Sales Service
Andersen provides dedicated installation support through Renewal by Andersen, backed by warranties and service teams. Communication is available through local dealers, in-home consultations, and customer care channels. In my experience, this structured support helps owners and engineering teams avoid common installation headaches.
Takeaway Notes
Andersen stands out for proven performance, broad distribution, and energy certifications that help projects meet sustainability targets. However, costs can run higher than mid-market brands, and lead times may be longer in peak seasons. For villas, hotels, and B&Bs that prioritize reputation and efficiency, Andersen remains a dependable choice.
2. Pella Corporation
Pella Corporation began in 1925 in Pella, Iowa, and has since grown into one of the most recognized window and door manufacturers in the United States. From its humble roots, the company has built a reputation for combining design with performance.
The company employs thousands of workers across multiple plants, showrooms, and distribution channels. This scale allows them to support projects ranging from individual homes to large hotels.
Pella continues to operate from Iowa but maintains a broad North American presence. For buyers, this wide reach means consistent supply, local service, and products that align with modern energy-efficiency standards.
Product Range
- Lifestyle Series Wood Windows: These windows are built for flexibility, featuring integrated blinds and shades. With ENERGY STAR® ratings, they deliver reliable thermal performance for both residential and hospitality projects.
- Impervia Fiberglass Windows: Crafted from a proprietary fiberglass formula, these windows resist warping and provide durable insulation. They are a smart choice for villas and hotels in demanding climates.
- 250 Series Vinyl Windows: Budget-conscious projects often choose this line. With low-E glass coatings, they help reduce heat transfer and keep cooling costs manageable.
Research & Development (R&D)
- Proprietary Fiberglass Innovation: Pella engineered its own fiberglass material for the Impervia line. This technology enhances strength and efficiency compared to traditional vinyl frames.
- ENERGY STAR Recognition: Many Pella products are listed as Most Efficient by ENERGY STAR. I’ll admit, I always check for that badge first it saves me from wasting time on suppliers who can’t prove their efficiency claims.
- Design Customization: The company offers flexible options such as integrated blinds and multiple glazing packages. These customizations allow builders to match efficiency goals with design preferences.
Customer Support & After-Sales Service
Pella supports clients through nationwide showrooms, online consultations, and local dealer networks. You can reach them by phone, in-home consultations, or digital channels. Their professional channels are designed for B2B buyers, making it easier to get specs, project estimates, and warranty support.
Takeaway Notes
Pella offers a wide product mix of wood, fiberglass, and vinyl, backed by recognized ENERGY STAR performance. However, costs vary by dealer, and service quality depends on local representatives. For B2B buyers managing villas, hotels, or B&Bs that need design variety and efficiency, Pella is a reliable candidate to evaluate.
3. Vallisco
Vallisco was established in 2024 as an independent company but is supported by over 20 years of expertise through its parent, Qeeka Home. This foundation gives them both the credibility of an experienced supplier and the flexibility of a new brand.
Headquartered in Jiading District, Shanghai, Vallisco operates its own factory facilities. This setup allows them to deliver at scale for commercial and residential projects, including villas, hotels, and B&Bs.
What struck me when I first researched Vallisco was their clear orientation toward B2B buyers. They’ve built their model to serve property owners and engineering teams handling projects, which in my experience often makes planning and coordination more efficient.
Product Range
- Thermal Break Aluminum Windows: Built with insulated barriers inside the frames to reduce heat transfer. This design improves energy efficiency for properties requiring stable indoor temperatures.
- Soundproof Windows: Use laminated glass and reinforced seals to block noise. These windows are well-suited for urban hotels or B&Bs near busy roads.
- Insulated Glass Windows: Feature multiple panes separated by air or inert gas. They help maintain indoor comfort while lowering heating and cooling costs.
Research & Development (R&D)
- Customizable Manufacturing: OEM and ODM services allow projects to request unique specifications or branded product lines. This flexibility supports hotels and villas that need consistent designs.
- Testing for Performance: Windows are evaluated for insulation, noise reduction, and durability. These procedures help ensure products meet energy efficiency expectations.
- Sustainability Compliance: CE and ISO certifications support access to international markets. Such labels reassure buyers about product safety and efficiency.
Customer Support & After-Sales Service
Vallisco provides direct consultation, export packaging, and logistics support for international buyers. Working factory-direct minimizes miscommunication and allows engineering teams to get clearer updates on orders and project requirements.
Takeaway Notes
Vallisco is a capable partner for large-scale builds that demand energy-efficient and customizable window systems. Their direct-from-factory approach and international certifications make them attractive for villas, hotels, and greenhouses. However, they are not suited for single-window or single-door orders, since their service model is structured for multi-unit projects
4. Marvin
Marvin was founded in 1912 and is headquartered in Warroad, Minnesota. The company has grown from a small, family-run business into one of the most respected window and door manufacturers in the United States.
Today, Marvin employs thousands of people and operates across North America. Their distribution network supplies both residential and commercial projects, from custom homes to hospitality buildings.
The brand is known for balancing craftsmanship with modern performance standards. Marvin’s long history and steady reputation make them a reliable name for architects, builders, and property developers seeking energy-efficient solutions.
Product Range
- Ultimate Wood-Clad Windows: Combine the beauty of wood interiors with aluminum exteriors. These windows deliver both aesthetic appeal and energy savings for upscale properties.
- Elevate Fiberglass Windows: Built with pultruded fiberglass, which is a composite material made for strength and thermal stability. They are highly resistant to temperature swings, making them ideal for hotels or villas in challenging climates.
- Essential All-Fiberglass Windows: Entirely fiberglass construction, designed for low maintenance. Their durability and consistent insulation performance make them cost-effective for large projects.
Research & Development (R&D)
- Material Innovation: Marvin invests in fiberglass and wood composites. These materials improve energy performance while extending product lifespan.
- Climate Testing: Windows undergo evaluations in both hot and cold conditions. This process confirms their resistance to warping and energy loss.
- Design Adaptability: Products are tested for compatibility with modern architectural demands. Options like expansive glass panels meet both functional and aesthetic requirements.
Customer Support & After-Sales Service
Marvin offers dealer networks, online resources, and direct consultations for buyers. What I’ve noticed with Marvin is their willingness to work closely with engineering teams during planning. That kind of collaboration can make a real difference when managing tight construction schedules.
Takeaway Notes
Marvin stands out for its material innovations, long-standing reputation, and ability to serve both residential and hospitality projects. Their fiberglass lines are especially valued for energy efficiency and durability. However, their premium designs often come with higher price points, which may be a consideration for budget-sensitive projects.
5. Milgard Windows & Doors
Milgard was founded in 1958 in Tacoma, Washington. Since its early years, the company has become a recognized name in the American window and door industry.
Now part of the MITER Brands family, Milgard operates multiple manufacturing plants across the western United States. Their distribution reach covers both residential and light commercial projects, including homes, villas, and multi-unit properties.
The company’s reputation has been built on combining practical designs with reliable performance. For property owners and engineering teams, Milgard is often considered a dependable mid-market choice for energy-efficient windows.
Product Range
- Tuscany Series Vinyl Windows: A premium vinyl line offering energy-efficient glass packages. These windows are popular for their balance of affordability and performance.
- Trinsic Series Vinyl Windows: Designed with slim frames to maximize natural light. They also come with energy-saving glass options suited for modern projects.
- Aluminum Series Windows: Provide a sleek look with durable aluminum frames. While not as insulating as vinyl, they are valued for strength and slim profiles.
Research & Development (R&D)
- Glass Package Development: Milgard creates custom insulating glass units (IGUs) to meet energy code requirements. These packages include low-E coatings that help manage heat transfer.
- Frame Engineering: Vinyl and aluminum frames are engineered for durability and thermal performance. I’ve seen projects where these frames held up well under years of use, proving their reliability.
- Energy Star Certification: Many Milgard windows qualify for ENERGY STAR, which means they meet government-backed standards for efficiency.
Customer Support & After-Sales Service
Milgard offers lifetime limited warranties on several product lines, which is uncommon in the industry. They provide customer service through local dealers, phone lines, and online channels. For engineering teams, this warranty support often adds confidence when sourcing windows for long-term projects.
Takeaway Notes
Milgard is a strong option for projects needing cost-effective vinyl or aluminum window solutions. Their energy-efficient glass packages and warranty support are key strengths. However, aluminum frames generally provide less insulation than vinyl or fiberglass, so buyers should weigh performance needs carefully.
6. JELD-WEN
JELD-WEN was founded in 1960 in Klamath Falls, Oregon. From a small millwork operation, it has grown into one of the world’s largest window and door manufacturers.
The company now has operations in more than 20 countries, employing thousands of workers across North America, Europe, and Australia. This global footprint allows JELD-WEN to serve both residential and commercial markets at scale.
Its reputation is tied to accessibility and variety. JELD-WEN products are widely distributed through home improvement retailers, making them a practical option for property owners and engineering teams working on diverse building projects.
Product Range
- Siteline Wood and Clad-Wood Windows: Combine the warmth of wood interiors with durable aluminum exteriors. These windows balance aesthetics and efficiency.
- V-2500 Vinyl Windows: Offer cost-effective energy performance with low-maintenance vinyl frames. They are a common choice for multi-family housing and budget-sensitive projects.
- Premium Aluminum Windows: Known for slim profiles and strength. While less insulating than vinyl or wood, they are valued in modern architectural designs.
Research & Development (R&D)
- Material Diversity: JELD-WEN invests in multiple frame materials—wood, vinyl, and aluminum—to match varying project needs. This range helps builders choose based on budget and climate.
- Glass Innovations: Products are available with low-E glass, argon fills, and multi-pane options. These upgrades improve insulation and reduce heating or cooling demands.
- Sustainability Focus: The company emphasizes sustainable sourcing of wood and maintains certifications like FSC (Forest Stewardship Council). This appeals to projects aiming for green building standards.
Customer Support & After-Sales Service
JELD-WEN provides customer service through retailers, online resources, and regional offices. Their wide distribution makes it easy to find replacement parts or warranty support, which is an advantage for property managers overseeing multiple buildings.
Takeaway Notes
JELD-WEN offers one of the broadest selections of window types at accessible price points, making them a versatile option for both residential and commercial projects.
Their sustainability efforts and material diversity add to their strengths. However, I’ve noticed that service can vary depending on the retailer or distributor you deal with, which means larger projects may require extra coordination.
7. Alpen High Performance Products
Alpen High Performance Products was founded in 1981 in Boulder, Colorado, with a focus on high-efficiency window technology. Over the decades, it has become known for developing products that go beyond conventional energy-saving standards.
The company operates from Louisville, Colorado, where it produces fiberglass and glazing systems that meet demanding performance benchmarks, including Passive House certification. This makes Alpen a frequent choice for projects that prioritize sustainability and reduced operating costs.
What I’ve always appreciated about Alpen is their willingness to tackle niche efficiency needs. For a buyer, that signals a manufacturer committed to measurable performance, not just marketing claims. It’s the kind of focus that gives engineering teams confidence when specifying windows for complex projects.
Product Range
- Zenith Series Windows: Fiberglass frames with multiple glazing options, including triple-pane glass. Built for homes and commercial buildings needing maximum efficiency.
- Tyrol Series Windows: Designed to meet Passive House standards with exceptionally low U-values. These windows are often used in net-zero energy projects.
- Tranquility Series Windows: Provide superior noise reduction along with insulation. Ideal for hotels or B&Bs located in high-traffic areas.
Research & Development (R&D)
- Passive House Innovation: Alpen develops products that exceed ENERGY STAR standards and achieve international green certifications.
- Advanced Glazing Systems: Uses suspended-film technology inside panes to provide lightweight but highly insulating designs.
- Climate-Specific Testing: Tests products for both cold and hot climates to verify consistent performance across regions.
Customer Support & After-Sales Service
Alpen works directly with architects and builders, offering technical support, consultation, and warranty services. Their team provides energy modeling assistance, helping property owners and engineering teams understand long-term efficiency benefits.
Takeaway Notes
Alpen is a standout for projects that require high-performance glazing and strict efficiency standards. Their products are trusted in both residential and commercial builds. However, their triple-pane and suspended-film systems can be harder to source locally, and replacement parts may not be as readily available as more conventional window options.
8. Internorm
Internorm was founded in 1931 in Linz, Austria, as a small locksmith’s shop. Over time, it grew into Europe’s leading manufacturer of energy-efficient windows and doors.
Today, Internorm operates production facilities in Austria and supplies to more than 20 countries across Europe and beyond. Their large distribution network allows them to serve residential and commercial projects of varying sizes.
The company is particularly known for pioneering innovations in window insulation, making them a preferred choice for projects that need to meet strict energy codes or green building certifications.
Product Range
- KF 410 uPVC/Aluminum Windows: Combine low-maintenance uPVC interiors with aluminum-clad exteriors. This pairing delivers strong insulation while protecting against outdoor elements.
- HF 410 Timber-Aluminum Windows: Feature natural timber inside with aluminum on the outside. These windows balance sustainability with durability, appealing to eco-conscious projects.
- KV 440 Composite Windows: Integrate blinds between panes of glass. This design offers privacy, shading, and insulation in one system.
Research & Development (R&D)
- Triple-Glazing Systems: Internorm offers advanced triple-pane glass options, which significantly reduce heat transfer in both hot and cold climates.
- Integrated Shading Solutions: Their products include blinds and shutters inside the glazing. This reduces maintenance while boosting efficiency.
- Smart Home Compatibility: Internorm invests in window technologies that integrate with building automation systems, supporting modern property management.
Customer Support & After-Sales Service
Internorm provides support through its network of local distribution partners. What I’ve found in European projects is that working through regional partners can be both a strength and a challenge. On the one hand, you get localized expertise. On the other hand, service consistency can vary depending on the dealer.
Takeaway Notes
Internorm sets itself apart with advanced glazing and integrated shading options that make windows more than just a barrier they become part of the building system. Their products are well suited for projects that demand high efficiency and modern features. However, the composite systems with built-in blinds can be more complex to maintain or replace compared to standard windows.
Conclusion
You’ve now seen eight trusted energy-efficient window manufacturers, each with strengths, limitations, and proven experience. These companies cover projects across homes, villas, hotels, and commercial spaces.
Choosing the right one isn’t about a perfect product it’s about finding the supplier who fits your project’s scale, budget, and energy goals.
That’s why I pulled together this list, so you don’t waste time second-guessing.
The best time to act is before energy bills climb and deadlines close in. Which of these manufacturers feels right for your project?
Contact Vallisco today and let’s get your shortlist moving.
