Simonton Window 3 RSI Simonton Window

Our classic style, high performance replacement windows are the best in the industry, available in double and single hung, sliding, casement, picture, awning and trapezoids. Bow and bay units are also available.

“NT Window”  and “Simonton”  are our prime window manufacturers,  both have excellent ratings and are members of the National Fenestration Council (NFRC), the council has established a standard method for rating the solar heat gain that is admitted through a window. The lower the SHGC rating the better the ability of the window to block the heat from the sun, more on solar heat gain and u-factors later.

NT Windows and Doors

All of our NT Windows and Doors have 2 panes of glass, low-e coating, and are argon gas filled between panes, triple glass is available upon request.

NT vinyl frames are available in White, Almond and Sandstone and our aluminum commercial frame is manufactured in Bronze color.

Our “NT Presidential”  series has superior e-366 ultraviolet sun ray protection and blocks 95% of the sun’s most damaging ultraviolet rays which are a leading cause of furniture fading. The presidential has Super Spacer technology which helps block heat and cold from passing through the window system. By keeping the elements from passing through, you will use less energy to heat and cool your home and condensation will be virtually eliminated.

One of the first things you will notice with your new windows is noise reduction, with the closed-cell polymer foam in the super spacer less sound is transmitted compared to conventional metal spacers. Tilt-in/lift-out sash promotes easy cleaning for double hung windows.

Our Presidential series windows come with high performance glass packages, are “Energy Star”  qualified and have lifetime warranties.

NT Patio and French doors are heavy duty and are use exclusively in our Myriad sunrooms.

All windows are sold at a 30% discount, call today for brochure or to request a estimate, all of our Myriad Sunroom Enclosures use NT windows.

Our main distribution center is 524 S. Hafner in Stillwater, Oklahoma where our office, warehouse, sheet-metal shop and display center is located.  Stop by our office any time. Our office hours are 8 am to 3 pm, Monday through Friday and other times by appointment.

DogHow to receive a FREE estimate: After we receive your request, our estimator will measure your project, work up an estimate at the office and mail out a bid package with all types of information to help you make a quality decision… there is never any selling pressure. Our detailed estimates are the best in the industry, every important point is in writing for your perusal. We will bring samples to your home upon appointment or stop by our office for a viewing.

Give RSI a call today!

Simonton Vinyl Replacement Windows and Doors 

Simonton Bow WindowSimonton windows are designed to deliver both structural strength  and thermal protection. Every inch of a Simonton 50/50 or 5500 series is meticulously crafted. Tilt-in/lift-out sash promotes easy cleaning (double hung only).

RSI Stillwater RoofingSimonton has been manufacturing windows for over 65 years and has just been awarded the J.D. Powers customer service award for 4 years in a row.

All of our Simonton windows have 2 panes of glass, low-e coating, and are argon gas filled between panes, triple glass is available upon request.

All styles are available including single-hung, double-hung, picture, sliding, bay and bow windows, patio and french doors.

energystar logo 1Our Superior “Simonton Windows”  have:

* Superior Ultraviolet Rays Protection-Block outside or inside heat or cold.

* Cost Savings-We save you 30% over other dealers.

* Noise Reduction-Noise reduction with super space and double or triple panes.

* Mold Prevention-Our super spacer technology virtually eliminates condensation.

* Longevity-Our windows will last for decades with no problems.

For a slideshow of Simonton windows by STYLE or COLLECTION, please visit

Types of Windows

RSI-Window Styles

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Window Anatomy

RSI Anatomy of Window

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Simonton Window Logo 2

Call today for a FREE estimate or click on our “FREE  ESTIMATE” tab to request a quote or ask a question.

 Call For Free Estimates

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Stillwater: (405) 372-7645 – Toll Free: (800) 475-2612


Our Location

  • 524 S. Hafner
  • Stillwater, OK 74074
  • Local: (405) 372-7645 or call us Toll Free: (800) 475-2612