✕
314.353.8350 The Intersection of Price and Quality®
Contact us

Energy Efficient Windows

Exterior of a St. Louis brick home with energy‑efficient white vinyl double‑hung and bay windows featuring Low‑E glass

Energy‑Efficient Windows for St. Louis Homes

Looking for year‑round comfort without sky‑high utility bills? At Viviano Window & Door, we match St. Louis homes with windows built for steamy summers, brisk winters, and everything in between—and we back it with The Intersection of Price and Quality®. We’re a family‑owned St. Louis dealer with 28+ years of value pricing, dependable products, and a low‑pressure approach. As a dealer, not a sales company, we offer straightforward options from multiple manufacturers, clear answers, and no one‑call‑close push.

  • Low‑E glass packages tuned for the Midwest to help cut heat gain in summer and heat loss in winter
  • Double‑ or triple‑pane glass with warm‑edge spacers and argon or krypton gas fills for better insulation
  • Tight‑sealing frames and professional installation to reduce drafts and outside noise
  • NFRC performance labels and ENERGY STAR‑qualifying options so you can compare and choose with confidence

Tell us your goals—lower bills, quieter rooms, better curb appeal—and we’ll recommend the right brand and glass package for your home and budget. Want to browse a bit first? See our Windows & Doors overview: viviano-inc.com/windows/

Ready to compare options or get pricing?

  • Request a free, no‑pressure estimate at 314‑353‑8350
  • Or visit our Shrewsbury showroom to see frames, glass packages, and colors side by side:
    7530 Watson Rd, Shrewsbury, MO 63119
    Hours: Mon–Fri, 8:00 a.m.–4:00 p.m.; Closed Sat–Sun

Ask about current specials and available financing. Call for complete details of all sales and specials.

Get a Free Quote View Specials

Why Energy Efficiency Matters

Windows play a bigger role in comfort and energy use than many people realize. The U.S. Department of Energy estimates that heat gained and lost through windows accounts for about 25–30% of home heating and cooling energy. If certain rooms feel drafty in winter, too bright in summer, or your bills keep creeping up, efficient windows help keep conditioned air inside and weather outside—so your home feels better, and your system works less.

Our mixed‑humid climate brings sunny, muggy summers and chilly, windy winters. Your windows need to do both jobs: cut solar heat and glare in July and hold warmth and block drafts in January. The right combinations also help manage condensation during spring and fall. That’s why we match glass packages and frame options to your home’s orientation, shade, and style rather than pushing a one‑size‑fits‑all product.

  • More even temperatures from room to room
  • Fewer drafts and fewer hot or cold spots near windows
  • Lower utility bills over time from reduced heat transfer
  • UV protection to help preserve floors, furniture, and fabrics
  • Less noise with multi‑pane and insulated frames

Some ENERGY STAR certified replacement windows may qualify for a federal tax credit under current IRS rules. We don’t guarantee eligibility because requirements can change. Please check IRS guidance or ask your tax professional. We’re happy to flag qualifying options and provide product documentation.

Not sure where to start? Call 314‑353‑8350 or request a free, no‑pressure estimate. We’ll review U‑Factor, SHGC, Low‑E coatings, and gas fills in plain English, price good‑better‑best options side by side, and help you choose the package that fits your sun exposures and budget. Prefer to see samples first? Stop by our Shrewsbury showroom at 7530 Watson Rd, Monday–Friday, 8:00 a.m.–4:00 p.m. You’ll get clear answers and a written quote—where price and quality meet.

What Makes a Window Energy‑Efficient?

Efficiency comes from glass, frame, air‑sealing, and installation working together. Because we’re not tied to a single brand, we help you combine the right parts for your goals and budget. If you’re not sure where to start, tell us what you want to fix (drafts, noise, sun, or all three) and we’ll point you to the best‑value options.

3D cutaway of a triple‑pane Low‑E insulated glass unit with argon gas and a warm‑edge spacer
  • Low‑E coatings: Ultra‑thin metallic layers on the glass reflect heat and block much of the sun’s UV while allowing daylight. That keeps summer heat out, helps retain winter warmth, and reduces fading. Learn more: What is Low‑E glass and why is it important?
  • Multiple panes and insulated glass units: Two or three panes create sealed air spaces that slow heat transfer and reduce drafts near the window. Double‑pane is most common. Triple‑pane boosts comfort and efficiency, especially near large windows or in drafty rooms. Compare options: Double‑pane vs. Triple‑pane
  • Gas fills (argon vs. krypton): Inert gas between panes insulates better than air. Argon is cost‑effective for most double‑pane units. Krypton performs better in thinner gaps, often in certain triple‑pane packages. See the tradeoffs: Argon vs. Krypton Gas
  • Warm‑edge spacers: Spacers keep panes the correct distance apart. Warm‑edge materials conduct less heat than aluminum, reducing edge‑of‑glass heat loss and lowering condensation at the glass perimeter.
  • Insulated, multi‑chamber frames and durable materials: Quality vinyl, composite, or fiberglass frames with internal chambers resist heat transfer and help stabilize temperatures. Material insights: Which Window Frame Material Lasts the Longest? or Composite vs. Vinyl, Fiberglass, and Wood
  • High‑quality weatherstripping and sealing: Continuous, durable weatherstripping and tight seals around the frame and sash limit air leakage, a major source of drafts.
  • Professional installation: Proper shimming, flashing, backer rod, and sealants prevent air and water intrusion and help your window meet its ratings. See more: How Window Installers Prevent Leaks and Water Intrusion
  • ENERGY STAR and NFRC labels: ENERGY STAR shows a window meets regional efficiency criteria. The NFRC label lists U‑factor (insulation), SHGC (solar heat control), and VT (daylight), so you can weigh comfort and energy use.

Want a quick primer on glass types and upgrades? Start here: Replacement Window Glass Options Explained for Homeowners.

Ready to dial in the right efficiency package for your home? Request a free quote at viviano-inc.com/free-quote/ or call 314‑353‑8350. Prefer to see options in person? Visit our Shrewsbury showroom, Mon–Fri, 8–4. No pressure—just clear answers and solid value.

Climate‑Smart Choices for St. Louis Homes

St. Louis has a mixed‑humid climate with hot summers and cold winters, so aim for balance: good winter insulation (low U‑factor) and summer comfort (appropriate SHGC). Match the glass package to each room’s sun exposure and use. Not sure where to start? We’ll help you dial this in room‑by‑room—no pressure, just clear options that fit your goals and budget. Call 314‑353‑8350 or request a quick, free estimate: viviano-inc.com/free-quote/

  • South and west exposures: These get the strongest summer sun. Choose stronger solar control (lower SHGC) with advanced Low‑E to cut heat gain and glare. You’ll also get excellent UV protection; learn more: How New Windows Help Protect Floors and Furniture From UV Damage
  • North and shaded east exposures: With little direct sun, focus on insulation and daylight. Choose a low U‑factor to hold in winter heat, with a moderate SHGC and good visible light.
  • Large glass areas or seating near windows: Bay/bow windows, big picture units, or breakfast nooks stay more comfortable with higher‑performance packages such as triple‑pane or advanced double‑pane with argon or krypton and warm‑edge spacers to reduce radiant chill and condensation risk.
  • If noise is a concern: Laminated or asymmetric glass can reduce traffic or yard noise without giving up efficiency. Details: Do Replacement Windows Reduce Outside Noise?

Whatever you choose, look for ENERGY STAR‑qualifying packages for our region and verify performance on the NFRC label of the exact unit. Check U‑factor for insulation, SHGC for solar control, and VT for daylight so you can compare directly across brands. Want help reading labels? Quick guide: What is the NFRC rating? Bring a photo or your plans and we’ll translate the numbers into real‑world comfort at our showroom (7530 Watson Rd, Shrewsbury) or during a no‑pressure in‑home consult. Call 314‑353‑8350 Mon–Fri 8–4 or start here: viviano-inc.com/free-quote/

Compare Energy‑Efficient Glass Packages

Not sure which glass package fits your St. Louis home? Use this quick, brand‑neutral guide, then we’ll price your top choices side‑by‑side during a free, no‑pressure estimate so you can see exactly what you’re getting.

  • Good: Double‑pane Low‑E with argon — strong everyday performance and value. Best for balanced or shaded exposures, standard sizes, and projects focused on stopping drafts and lowering bills without over‑specifying.
  • Better: Enhanced Low‑E double‑pane with argon — extra solar control or insulation where needed. Ideal for west‑ or south‑facing rooms that overheat in summer, larger glass areas, or when you want more winter insulation than a basic Low‑E package.
  • Best: Triple‑pane Low‑E with argon or krypton — maximum comfort near large glass, drafty rooms, or tough exposures. Smart for big picture windows, bays/bows, rooms over garages, wind‑exposed walls, or spaces where you sit close to the glass and want stable temperatures.

Exact NFRC ratings (U‑factor, SHGC, VT) vary by manufacturer, size, grids, and spacer. During your quote, we’ll show the official NFRC labels for each option and explain the tradeoffs in plain language so you can compare directly—no jargon, no pressure.

  • Skip triple‑pane where shade and smaller openings make a quality double‑pane enough. Put those dollars toward rooms that need more performance.
  • Don’t skimp on big west‑ or south‑facing glass. Stronger Low‑E can noticeably cut summer heat and improve comfort.

Working within a budget? You can phase the project by priority rooms and exposures. Our take on replacing all at once vs. in stages: Replace all at once or in phases?

Next step:

  • Ask us for side‑by‑side pricing and the NFRC labels for each glass package you’re considering.
  • Call 314‑353‑8350 or request a free estimate at viviano-inc.com/free-quote/—no commissioned, high‑pressure sales.
  • Prefer to see options in person? Visit our Shrewsbury showroom at 7530 Watson Rd, Mon–Fri, 8:00 a.m.–4:00 p.m. We’ll help you find your intersection of price and quality.

How to Read ENERGY STAR and NFRC Labels

Those stickers are standardized, third‑party ratings for easy comparisons. The NFRC label lists the tested numbers. The ENERGY STAR logo indicates the window meets criteria for our region when built as labeled. Here’s a quick guide:

Close‑up of a window NFRC‑style rating label on a white vinyl frame showing U‑Factor, SHGC, and VT fields
  • U‑Factor: Overall insulation. Lower is better for keeping heat inside in winter and limiting heat transfer year‑round.
  • SHGC (Solar Heat Gain Coefficient): How much sun’s heat gets in. Lower helps in summer, especially on west and south windows. For shaded or north/east exposures, a moderate SHGC keeps spaces bright without extra heat.
  • Visible Transmittance (VT): Daylight passing through. Higher means brighter interiors. VT often drops as you add more Low‑E layers or panes, so balance daylight needs with SHGC and U‑factor goals.
  • Air Leakage (AL): Air that can pass through the assembly, in cfm/ft². Lower means fewer drafts. Many quality replacement windows test at or below 0.3 cfm/ft².
  • Condensation Resistance (CR): Higher is better for resisting interior condensation.
  • ENERGY STAR: Shows the window/glass package meets regional criteria. Changes to options like grids, tint, or pane count can affect whether the exact unit still qualifies.

A practical way to compare:

  • Photograph the full NFRC/ENERGY STAR label in the showroom or during your estimate so you can review later.
  • Start with U‑factor, then compare SHGC based on each window’s orientation and shading.
  • Check VT if natural light is a priority.
  • If shown, note AL and CR for drafts and condensation concerns.
  • Verify the manufacturer/model and glass package on your quote match the label. Small option changes can change ratings.
  • Keep labels or photos until installation so you can confirm you received the specified performance.

Bring your photos or spec sheets to our Shrewsbury showroom (7530 Watson Rd, Mon–Fri 8–4) and we’ll help you interpret labels across multiple brands with no pressure. Prefer a quick consult? Call 314‑353‑8350 and we’ll review your numbers and suggest the right glass package for each side of your home. Ask for a free, itemized quote—our proposals list the NFRC values so you can compare clearly and stay within budget.

Proper installation ensures you get the efficiency the labels promise. Ask us to show you, during your estimate, the exact steps we use—flashing, sealants, foam insulation, and sill pan details—so you know how we protect air‑ and water‑tightness and long‑term performance. Accurate measurements help, too: Why Accurate Window Measurements Matter Before You Order and what to avoid if sizes are off: What Happens When Replacement Windows Are Ordered the Wrong Size?

Installation Quality That Protects Efficiency

Even the best windows can underperform if installed poorly. Our process is designed to deliver an airtight, watertight fit that preserves the efficiency you’re paying for—without a high‑pressure experience. If you’re comparing quotes in the St. Louis area, let us measure and price your project so you can see the difference for yourself. Want to see real results? Browse recent projects: Our Work

Start with a free, no‑pressure estimate

Pocket vs. full‑frame: what’s right for your home

  • Based on the condition of your frames, trim, and exterior, we’ll advise whether an insert (pocket) replacement or a full‑frame replacement best protects efficiency, addresses damage, and meets your design goals. How we decide: Full‑frame vs. insert replacement windows

What happens on install day

Professional window installer applying flashing tape and low‑expansion foam around a replacement window opening with floor protection in place
  • Protect your home: Floor runners, drop cloths, and careful setup to contain dust and protect furnishings.
  • Remove old units: Methodical removal to avoid damage.
  • Prep the opening: Inspect for rot or moisture and repair as needed. Confirm the opening is square, plumb, and level.
  • Flashing and sealing: Install a sill pan or equivalent protection and apply flashing tape at the sill, jambs, and head for a continuous drainage plane suited to our climate.
  • Insulation: Use low‑expansion foam around the frame to reduce drafts without bowing the unit.
  • Set and square the new window: Dry‑fit, shim, and fasten per manufacturer specs. Verify smooth operation and proper weep paths.
  • Interior and exterior finishing: Reinstall or replace interior stops or casing. Complete exterior trim or capping. Apply high‑quality sealants appropriate to your siding or masonry. Concerned about trim or drywall? See: Will Window Replacement Damage Interior Trim or Drywall?
  • Clean up and walkthrough: Vacuum work areas, remove debris, and show you how to operate and care for your new windows.

Lead‑safe practices for older homes

Old window disposal and recycling

  • We haul away your old windows and, where local facilities allow, recycle components like aluminum and glass. How we handle disposal: Old windows after replacement

Scheduling and timelines

  • After you place your order, we keep you updated on manufacturing and scheduling so you always know the next step. Typical timelines: Contract to installation timeline
  • You’ll have a single point of contact for updates and questions—no runaround.

Warranties and after‑install support

  • Your windows include manufacturer warranties, and our workmanship is backed by service you can reach. Coverage overview: Window warranties

With installation handled the right way, the next step is choosing the window line and glass package that balance performance and price. As a multi‑brand dealer, we match you to options that fit your home and budget, not a single manufacturer. Talk with us about ENERGY STAR–rated choices and pricing today: call 314‑353‑8350, request a quote at viviano-inc.com/free-quote/, or visit our Watson Rd showroom.

Brands and Options We Carry

As a dealer, we source multiple manufacturers to fit your goals, home, and budget. That includes respected names like Sunrise and Polaris, along with other options we can compare side by side so you pick what’s best for you—without the high‑pressure sales tactics. Browse an overview of our lines: Our Products or explore the Windows & Doors hub.

Most configurations we recommend offer ENERGY STAR‑compliant packages for the St. Louis climate. During your quote, we’ll show the exact NFRC labels for your selections (U‑factor, SHGC, and more) so you can compare directly and understand why a package performs the way it does. If you’d like a quick explainer before we meet: What is the National Fenestration Rating Council (NFRC) rating?

Prefer products made in the USA? We can prioritize those and note origin on your quote. Quick primer: Are the windows made in the USA?

Not sure where to start? Tell us your priorities—price, curb appeal, comfort, noise reduction—and we’ll price 2–3 great fits so you can compare apples to apples. You can also brush up on options here:

Popular styles we carry and install:

See more window and door options here: viviano-inc.com/windows/

Finish your look with:

Ready to compare options and pricing? Request a free, no‑pressure quote at viviano-inc.com/free-quote/ or call 314‑353‑8350. Ask about current specials: viviano-inc.com/specials/

See everything in person at our Shrewsbury showroom. Touch the frames, compare glass packages, and view real color samples:
Viviano Window & Door, 7530 Watson Rd, Shrewsbury, MO 63119. Typical hours: Mon–Fri, 8:00 a.m.–4:00 p.m. Call 314‑353‑8350 to confirm hours or set up a no‑pressure visit.

Pricing, Savings, and Flexible Financing

Our value promise is simple: more money in your windows, less in our overhead. We keep costs down and avoid high‑pressure, commissioned sales so pricing reflects The Intersection of Price and Quality®, not TV ads and markups. That’s how we stay competitive in the St. Louis area—transparent quotes, real choices, no gimmicks.

What drives your project cost:

  • Window count and sizes, including oversized or custom shapes
  • Frame material (vinyl, composite, fiberglass, or wood‑clad) and build quality
  • Glass package (double vs. triple pane, Low‑E layers, argon or krypton gas, warm‑edge spacers, laminated or tempered where required)
  • Installation method (insert/pocket vs. full‑frame), needed trim work, and site conditions
  • Styles and operations (double‑hung, casement, slider, picture, bay/bow)
  • Finishes and options (interior/exterior colors, hardware, grids, blinds‑between‑glass)

Want a ballpark before we measure? See local ranges and variables for St. Louis, then get your exact price: How much does window replacement cost in St. Louis?

About savings: energy‑efficient windows can improve comfort and help reduce heating and cooling use, but results depend on your home, existing windows, glass package, installation quality, and utility rates. During your estimate, we can compare glass packages so you see what’s worth it for your home.

Pay your way with financing and payment options (we’ll walk through choices during your quote):

We keep promotions straightforward. See today’s specials and ask us to apply any eligible offer to your quote: viviano-inc.com/specials/

Ready for numbers you can compare? Get a free, no‑pressure written estimate with clear, side‑by‑side package options (good/better/best). Call 314‑353‑8350 or request a quote online. Prefer to visit? Stop by our showroom at 7530 Watson Rd, Shrewsbury, MO 63119 (Mon–Fri, 8:00 a.m.–4:00 p.m.). Bringing rough sizes or photos can help us get you a quicker ballpark.

Start My Free Quote Check Current Specials

Prefer to read up first?

FAQs and Helpful Resources

Start with these quick guides from our team to cut through the jargon and see which specs actually matter for comfort and savings in St. Louis. Skim a couple, then call and we’ll translate the labels and options into a clear, budget‑friendly plan for your home.

  • Are replacement windows energy‑efficient? What “energy‑efficient” means, which features matter most, and how efficiency affects comfort and bills. Read more
  • Are replacement windows ENERGY STAR approved? Not every window is certified. What the label means and how to shop by region and performance. Read more
  • NFRC ratings explained A simple breakdown of the NFRC label—U‑factor, SHGC, and Visible Transmittance—for clear comparisons. Read more
  • Argon vs. Krypton gas in windows When to choose each gas fill, how they work with double vs. triple panes, and what to consider for our climate and budget. Read more
  • Double‑pane vs. triple‑pane windows The tradeoffs between cost, comfort, condensation resistance, and noise reduction, plus where triple‑pane makes sense. Read more
  • Which window material is best for Missouri’s climate? Compare vinyl, fiberglass, composite, and wood for durability, maintenance, color options, and thermal performance. Read more
  • Full‑frame vs. insert replacement windows How each method works, when to use it, and what it means for efficiency, appearance, and timeline. Read more
  • When is the best time of year to replace windows in St. Louis? Seasonal tips, scheduling insights, and how lead times and weather affect timing. Read more
  • Can I replace windows in winter without losing heat? Yes. How pros stage rooms, protect your home, and limit heat loss so projects can move forward year‑round. Read more

Want tailored recommendations without the sales pressure?

  • Tell us your goals (lower bills, quieter rooms, curb appeal).
  • Share how many windows and any problem spots (drafts, condensation, sticking sashes).
  • We’ll suggest the right glass package, frame material, and install method for your home and budget—and explain the “why” in plain English.

Prefer to see and feel the options first? Stop by the showroom to compare real NFRC labels and glass packages side by side.

Ready for next steps or still comparing options? Visit our showroom at 7530 Watson Rd, Shrewsbury, MO 63119, Monday–Friday, 8:00 a.m.–4:00 p.m. Call 314‑353‑8350 for today’s specials and complete details, or request a free, no‑pressure estimate anytime: viviano-inc.com/free-quote/

Visit Our Showroom or Schedule a Free Estimate

Stop by our family‑run showroom to see energy‑efficient glass, frames, and hardware in person—no sales pitch, just clear answers. We’ll help you compare options for St. Louis homes, explain real performance differences, and match you to the right balance of price and quality at The Intersection of Price and Quality®.

  • Showroom: 7530 Watson Rd, Shrewsbury, MO 63119
  • Hours: Mon–Fri 8:00 a.m.–4:00 p.m.; Closed Sat–Sun (walk‑ins welcome during business hours; appointments encouraged)
  • Phone: 314‑353‑8350
  • Service area: St. Louis metro and nearby communities (we also come to you for in‑home estimates)

What to bring for faster guidance:

  • Photos of your windows/doors and rough measurements (width × height)
  • Notes on rooms with drafts, condensation, or strong sun
  • Optional: recent utility bills or HOA notes (helps us tailor efficiency and compliance)

During your visit or in‑home estimate, we’ll:

  • Walk you through NFRC labels and explain U‑factor and SHGC in plain English
  • Compare “good‑better‑best” price options from multiple manufacturers
  • Show finish, glass, and hardware samples so you can see and feel the differences
  • Flag any available promotions or incentives and review installation details

Next steps:

Want extra peace of mind?

Please Call For Complete Details of All Sales

Visit Our Showroom :
Viviano - Window & Door
7530 Watson Rd, Shrewsbury, MO 63119


Working Hours :
Monday - Friday: 8:00 A.M - 4:00 P.M

Saturday Closed

Closed Sunday

Copyrights 2025 area reserved by Viviano Inc