High Performance Fiberglass Windows

Casement, Awning, Fixed & Picture

when only the best of the best will do

Enerlux offers casement, awning, fixed casement and picture window models. Our high performance fiberglass windows feature:

Pultruded fiberglass frame and sash with corners that are siliconed sealed and chemically bonded together utilizing our proprietary two component adhesive. The chemically bonded corners create a stronger window with better quality miters.

Thick walled fiberglass pultrusions with a closed frame instead of an opened frame. The closed frame design creates a much stronger and more rigid window when compared to the industry norm of open framed fiberglass windows.

Foam filled frame and sash designed to increase the energy efficency of the window.

Triple weather-stripping using top quality Qlon foam seals provide an air and water tight perimeter that does not shrink or expand with temperature fluctuations.

Slim line design of our contemporary low profile picture window frame measures only 1.5″ tall, which provides more glass area for a bigger, brighter, and cleaner view.

Multiple color options using Sherwin Williams Polane S Plus commercial grade polyurethane enamel coatings.

Multi-point locking system keeps the casement and awning windows closed tightly against the elements with one simple operation.

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Folding handle allows for various interior window treatments with no interference from the attractive handle.

Customized glass packages using energy efficient, solar tuned Cardinal double pane and triple pane IGUs.

NFRC and Energy Star Tested to guarantee the ultimate in energy efficiency.

Custom Manufactured for your home so you can be assured of a perfect fit.

20-Year Warranty covers the entire window and labor. No hidden charges, plus it’s transferable. This means new windows for your home and peace of mind for you.

Benefits of Fiberglass

Stronger: It is 8x stronger than vinyl and 2x stronger than aluminum.

More Energy Efficient: 500x lower thermal conductivity than aluminum, so it doesn’t allow heat or cold from the outside into your home.

Longer Lasting: Almost zero thermal expansion rate (essentially the same rate as glass) means tighter seals against weather and longer lasting.

Lower Maintenance: Virtually maintenance-free frames stay true to form due to strength of materials. No need for sanding, painting, or staining.

Environmentally friendly: Our material uses less embodied energy and resources to manufacture. Made from partially recycled materials.

More Durable: Won’t discolor, warp, rot, corrode, dent, or rust. Can withstand winds up to 203 mph, and does not absorb moisture.

Slimmer in profile: Because of the strength of the fiberglass, the frames are slimmer allowing more visible glass area in each window.

Unlimited in Design Possibilities: Offered in virtually unlimited colors and an interior wood veneer.

Insulated Glass Packages

LoE 180
LoE 2 270
LoE 3 366
LoE 3 340

For more information on our energy efficient insulated glass packages, click here.

Insulated Glass Packages

Neat Glass
Preserve Glass

For more information on our glass upgrades, click here.

Decorative & Tinted Glass Options

English Reed

English Reed





Satin Etch

Satin Etch

Glue Chip

Glue Chip

To view more decorative and tinted glass options, click here

Color Options
High Performance Fiberglass Windows - Color Options

For more information on our color options, click here

Hardware Options

To learn more about our hardware options, click here

Decorative Grilles
Queen Anne


To learn more about our decorative grille options, click here.


BetterVue Screen Mesh

BetterVue Screen

All Casement and Awning windows come standard with BetterVue Screens. BetterVue screens use a much finer mesh that allows 20% more visual clarity, 20% more airflow, 20% more visible light and protection against smaller insects.

Minimum and Maximum Dimensions
Casement Awning Fixed Casement Low Profile
Minimum 16″ W x 24″ H 20″ W x 16″ H 14″ W x 14″ H 14″ W x 14″ H
Maximum 36″ W x 84″ H 60″ W x 40″ H 96″ W x 96″ H 96″ W x 96″ H

For a printable PDF version of our Min-Max dimension, click here

AAMA Test Ratings
Window Type Test Size
(in. x in.)
(cfm/ft² )
Wind Load
Forced Entry
Casement 36″ x 68″ 0.01 60 60 60 Yes
Awning 60″ x 40″ 0.01 70 70 70 Yes
Fixed Casement 72″ x 72″ 0.01 70 70 70 Yes
Low Profile Picture 72″ x 72″ 0.01 60 60 60 Yes

These tests have been performed as per the following standards: AAMA/MWDA 101/I.S.2-97

For a printable PDF version of our AAMA structural test ratings, click here

  • Excellent
    Based on 48 reviews
    Neil Lichtman
    Neil Lichtman
    We have been interested in adding a fiberglass window to our product line. We finally found Enerlux, and Zach Birchel did not disappoint. We worked for a year to land a commercial project, and everyone at Enerlux was extremely helpful in getting the project completed without difficulty. We even ordered three openings wrong, and they turned around and shipped the new windows so the project was not delayed. THANK YOU!
    John White
    John White
    Six stars -esp in the context of the USA residential window industry today Let me state at the outset some of my comments will be unguarded, but I want to be taken seriously and not for an amateur, paid shill or bot with readers facing the awesome challenge of finding windows that will last 50 plus years and not break the bank. It’s manifest that most established American widow makers have gotten greedy and lazy, focus on marketing and expensive dealer networks, an in many cases , cheapened the quality of heir product. I know, I’ve been there. As a small builder in process of building a house for my daughter, I scoured the universe for well over a year trying to max out her window budget. Once you eliminate Euro windows as too bulky and frames too wide, and real fulfillment questions from overseas (and on time ? And what if a window broken in transit ? That’s a 3 month delay even with the best customer service; I’ve know several boutique Italian manufacturers will send a replacement air freight at 3x the cost of the indoor itself , but if you have to ask how what those windows cost in the first place, you cant afford them) Also the superiority of fiberglass as a frame material becomes quickly apparent. , and Enerlux corner design in particular. Durability, strength, thin lines, top euro quality hardware, etc. Whether you are going for a modern or traditional look, if your budget allows for anything beyond an Anderson 100 series, you HAVE to look at Enerlux as an option. Look, SChuco, Loewen, Western , Raynor , even Marvins high end, make great windows and offer solid customer service ….. if your are paying $100k plus for an architect, or have more money than brains, , hey go for it….you cant go wrong with them . A number of my clients have ; BUT at a steep price differential, and NOBODY has a better quality frame or , customer service than Enerlux. (And for course they are all using-or should use-Cardinal glazing units .While a smaller firm, there is NO way they wont be around for the lifetime of your windows. And in this case, buy AMERICAN -makes GREAT sense from a fulfillment and follow thru service standpoint. Their product, attention to detail and customer service make it impossible for this company not to grow and endure. Customer service is UNPARALLELED- just pick up the phone and try it-you get a real attentive knowledgeable person. You must pay considerably more to get a remotely comparable Marvin ( let alone Weathershield or Pella (dont even start !! LOL ) custom color fee set ups are a fraction of the bigger players. Unless you are seeking passive house standards, are willing to try some of the newer-but unproven - hi-tech glazing options being offered by some manufacturers in the western states, OK with Euro UPVC, not USA vinyl (nothing wrong with them if UV exposure reasonable and youre ok with the look, and size limitations ) can wait out long lead times, countenance dealing with a middle man importer (will they be around ten years from now?) Buying quality windows is a jungle and /or expensive these days- do yourself a favor - go to their web site, dive deeply into it , and get your first quote from Zach Birkel and his team. And if you are in the Mid ATlantic area, happy to show you ours.
    Ardis Koehn
    Ardis Koehn
    I'm a retired teacher and wanted the best windows for the buck, so I researched the internet for fiberglass windows and doors. I found them (ones superior to others with incredible price)...EnerLux Windows made in Crete, NE! I even toured the plant with the owner, Mark, where they were made and was so impressed. Hiring an experienced window installer who had never installed this brand commented, "These are awesome," made me feel great. EnerLux even had one of their top guys, Zach, come out 2 times to answer our questions and assist! Beautiful windows!
    ryan alger
    ryan alger
    We ordered triple pane windows for a client to meet our energy demands. The windows are arrived in excellent shape using a dedicated shipper. the windows themselves are of excellent quality and without the usual adhesive bubbles you see on most new window packages. The customer experience with Enerlux from quoting to ordering is an easy, no pressure kind of experience. I was able to see the difference in price from double to triple pane as well as what/how different sizes affected our quote.
    Nate Lewis
    Nate Lewis
    These are the best windows ever! The installers, who install every major brand, spontaneously said the same thing multiple times. They put together a custom glass package to meet my local fire code regulations and to also just nearly completely wipe out noise problems at my home, that no other major manufacturer could or would come close to doing; the windows all work (!) seamlessly when installed square (unlike the other major brands that cost 2 or 3 times more with less quality); the air penetration is near-zero and the thermal properties are great; the frames and hardware are well built, and the Enerlux people were unbeleivably cooperative and supportive; Krystal is off-scale helpful and patient and responsive; she gets five stars just by herself! I did my whole house with Enerlux and would do it again in a heartbeat!
    We have had a great experience working with Enerlux. Our first order was $40k worth of triple pane windows for a $175k reno and they did not disappoint. We just did an initial walk through for a 600k reno and we all smiled when the homeowner mentioned triple pane windows. In our business having a source that you can rely on for hi end products made in the USA is invaluable. Enerlux you are on the RLRider team!
    Tao Gong
    Tao Gong
    We installed all EnerLux windows on our new build earlier this year. We worked closely with Mark, who was amazing to work with. He is patient, thoughtful and efficient - the service was beyond what we expected and imagined. He gave us suggestions that made our home even more energy efficient and even coordinated the delivery so the installation could be done prior to snowfall. Our builders also enjoyed working with Mark. The windows are also very high quality and installation went smoothly. We are really glad we picked Enerlux windows
    Sean Bottger
    Sean Bottger
    After 20 years of remodeling and construction in the Lincoln area, I have installed and worked with the majority of window brands. When deciding what window to use for a new house, my family moved into. I stumbled across Enerlux. Boy am I glad that I did. Everyone in the company was a pleasure to work with and these windows are by far the best windows I have ever installed. The difference in noise and air quality in our home is massive. I have already referred them to numerous other people and will continue to share my experience. They are a small company with quality set as their number one goal. I look forward to working with them in the future. Also, a big shout out to Zach Birkel who did an amazing job working with on the sale from start to finish!
    Matlock Jeffries
    Matlock Jeffries
    Great interactions with Enerlux, and so far appears to be a great product. Ordered triple pane windows for a near-passive-house new build. High quality frames and finishing, high NFRC performance. Delivery was straightforward and easy. No negative things to say, everything went smoothly.

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