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Interstate Windows & Doors

Interstate Windows & Doors

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.`


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