Looking for high-quality vinyl or composite windows for your Maryland, Virginia, or Washington, DC-area home? Quality Window & Door is a proud Interstate Window & Door dealer in the Maryland, Virginia, and Washington, DC, area! Founded in 1938, Interstate Windows & Doors has become an authority on high-quality vinyl and composite vinyl windows and doors.
Choose from traditional vinyl windows or CompositWood vinyl windows — offering the same benefits of vinyl windows combined with the warmth and aesthetics of finely milled wood windows!
Interstate Window Features
Interstate windows can keep your home comfortable year-round! Features include:
ClimaGaurd Low-E Glass — This glass has a transparent metallic oxide coating applied to its surface that differentiates it from other window companies. With this glaze, your windows will reflect the long-wave infrared energy waves responsible for heat loss and higher energy bills. With Interstate windows, say hello to fewer energy expenditures and more comfortable temperatures year-round.
Argon gas — Interstate windows have layers of panes filled with argon gas. Six times denser than the atmosphere, this odorless, colorless, and nontoxic gas is in between panes to keep you warm in the winter and cool in the summer.
Multiple pane options — Choose between dual glazed, fuel saver, fuel saver plus, and a variety of other pane options. Multiple pane options allow you to make the right choice for your home, so whether you want to save money on your energy bills or pick a window that’s within your budget, Interstate windows has something for everyone.
What Are the Benefits of Insterstate Windows?
Interstate windows pose many benefits:
Low maintenance — Interstate carries vinyl windows, meaning once installed, they don’t require any maintenance! These windows won’t rot or need fresh coats of paint. A simple cleaning with a damp cloth is all you need to get them looking good as new.
Lower energy bills — Want to save on your heating or cooling expenses this year? Consider Interstate windows. Vinyl windows are one of the most energy-efficient window materials available, making them an excellent investment.
Reduced noise — Are your next-door neighbors extra rowdy? Forget about noise complaints with Interstate windows. Vinyl windows are some of the best at reducing noise. Opt for Interstate windows if this is one of your concerns.
What Types of Window Styles Are Available?
Whether you need awning, double-hung, or bay, Interstate windows come in a variety of styles:
Double-hung — One of the most popular choices. Open this functional window from either the top sash or the bottom.
Slider — The exterior glaze on this window creates a non-caulked joint to facilitate easy opening and closing. The “swing in sash” feature also allows for easy cleaning.
Casement/awning — The remarkably strong frame on this window style also has insulated glass panes for extra thermal performance.
Pictures/shapes — Whether you have an oval-shaped window or quarter arch, Interstate windows suit a variety of intricate and sophisticated design shapes.
Bow/bay — Make any room in your home appear bigger with bay windows. Steel rods between the window struts can tie the head and seat boards together for extra strength!
Patio doors — Enjoy the breathtaking views from your patio with an Interstate patio door. Made with tempered glass, all Interstate patio doors follow the NFRC and AAMA guidelines.
Why Choose Quality Window & Door to Install Your Interstate Windows & Doors?
Don’t hesitate to give the experts at Quality Window & Door a call. We have all the tools, techniques, and knowledge to help you make the best decision for your home’s needs. Whether you opt for Interstate windows or another of our superb manufacturers, we’d love to help! Don’t hesitate to visit our window showroom!
Frequently Asked Questions
What is an argon gas infill?
Interstate windows have an argon layer in between each pane to maximize insulation and improve energy efficiency. Argon has 6 times the density of the natural atmosphere, so it improves your glass’s thermal performance while preventing heat from transferring into your innermost pane. Unlike ordinary air infills, argon doesn’t condense or create fog, so your windows will remain clear even on the coldest days.
What pane options can I choose from?
Interstate Windows are offered in double glazed, triple glazed, and fuel-saving products. Their Triple Fuel Saver Plus product has a U-factor of 15 to 17. Their Triple Fuel Saver Max is the premium product in the range, offering a pure krypton layer that reduces the U-factor to a minimum of 13.
What is composite wood?
Interstate’s composite wood windows are constructed from polymers, resins, and a fused SuperCap layer. They offer the aesthetics of wood without the drawbacks. Their surface technology protects your window surface and improves its thermal performance. Interstate’s CompositeWood windows offer a U-factor that’s 3 times the Energy Star® requirement, so they’re perfect for tough climates.
What qualities does the Duralite Spacer System offer?
Most windows rely on a metal or foam spacer to achieve a gaseous layer, but polymers offer a superior U-value. The Duralite Spacer System traps air more effectively, saving you money while saving the planet.
What’s the difference between vinyl and composite wood?
Vinyl and composite wood are designed to achieve a natural wood finish without the drawbacks, but composites offer a more realistic resemblance because they contain real wood fiber. Composites are typically thicker than vinyl, so they can offer 200% more insulation power. Vinyl windows still have important benefits, though. They don’t warp or expand in response to moisture, so they’re far more durable than composites. In climates that must endure hail and snow, vinyl offers a longer life span. If you’re looking for better aesthetics, however, composites will probably serve you best.
What can I expect from ClimaGuard Low-E Glass?
ClimaGuard products minimize heat loss without reducing the brightness of your natural light. They’re cool in summer and offer exceptional solar control, so you can finally wave goodbye to sun bleaching. The Premium 2 S offers 79% light transmittance at a solar heat gain coefficient of 0.55. This will reduce your energy bills and support your HVAC’s heating capacity.`
Why Choose Us?
All of our consultants have 10+ years of experience
Learn about how our educational approach makes Quality Window & Door stand out from its competitors.
I have been working with this company for many years, trusting that if problems were to arise with a product, Quality Window would find a happy outcome for the customer. This has been the case!!
Mike Hudson is a thorough and profesional sales representative, always willing to patiently take a call and mitigate doubts and concerns. John Poulos offers amazing customer service. Always prompt and communicative. The liaison between company and client could not be in better hands!!
Thank you.
scarlet narciso
2025-07-25
Great company that backs their product. We built a new house and Quality Window & Doors was the subcontractor for our Weathershield windows and doors.
Wayne and Noe came out to service a broken handle on our 16' Weathershield sliding door. We were technically beyond the warranty period but they repaired the handle for free. They also took the time to go around and adjust our other exterior doors to make sure they were well aligned now that the house had settled a bit. Wayne was a real expert and got all the doors adjusted and working perfectly!
Tucker Jones
2025-07-09
Excellent products and service. The install went well too! Would definitely order from them again.
John Fu
2025-06-22
Great service. I highly recommend Quality Window and Door for information, purchasing and service. I have used this firm for a number of years both as an architect and as a client. I've always been very satisfied with their products and service.
McCain McMurray
2025-06-18
We are thrilled with our new windows and door! Excellent job from estimate to completion! The install team was fantastic and I loved that the lead installer was also present during the initial measurement phase. It took a few months for the windows to arrive so it was really nice to see a familiar face for the install and he knew exactly what to do! Highly recommend!!
Brenda
2025-06-15
Quality Door and Window did a fantastic job at a reasonable price.in installing 23 replacement windows, including the combination of two windows into one larger picture window. Highly recommended.
Daniel Leach
2025-05-16
QWD is a first rate company. The staff from product selection, estimate, showroom, measurement and installation were professional and highly competent. The installation crew paid attention to detail and went through great lengths to ensure our satisfaction. I love the new windows and I recommend them without reservation.
Sal Golub
2025-02-20
Have relied on QW&D for all my window and door needs for over 25 years. I know I can count on their expertise and responsiveness.
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