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Tired of drafty frames rattling in winter coastal winds? Our in-house crews install OKNA replacement windows throughout Atlantic, Cape May, and Ocean counties.
Energy Windows, Doors & More is an authorized OKNA dealer serving South Jersey, and the OKNA Eco-Pro | 600 Series is the line we carry. We bring actual window cutaways right to your living room, take tight measurements, and hand you a firm, written quote. No hard closes. Zero sales pressure.
The Eco-Pro | 600 Series strips out the bloat while keeping heavy-duty performance where it counts. Many vinyl windows on the market feel like cheap, hollow plastic that warps the second direct summer sun beats down on them. The 600 feels substantial in your hands. You get certified thermal numbers and tight sightlines without paying the steep markup of boutique composite brands.
The 600 Series earns its reputation in the details you cannot see from the curb.
The sash and 3¼-inch frame corners are fusion-welded multi-chamber uPVC with beveled colonial exterior curves. That design maximizes the weld surface area, meaning no mechanical corner separation, no caulk failure down the road, and zero cold air leaking through the joints.
Bulky vinyl makes rooms feel like basements. These narrow profiles maximize visible glass area so you actually see your yard instead of two inches of white plastic.
Three dense layers of weatherstripping meet an integral interlock. When wind slams against the exterior pane, the sash locks down tighter against the frame.
High-density composite reinforcement runs inside the locking sash, stopping the frame from bowing under heavy coastal winds or settling over time.
Cheap windows rely on weep holes that clog with dirt, freeze solid in January, and rot out your stool. OKNA builds a true one-piece sloped sill with a double dam leg mortised straight into the jamb, stopping chimney-effect drafts and letting water run off cleanly.
Isolates the glass panes to keep the interior glass edge warm to the touch, drastically cutting winter condensation beads.
Engineered for up to 28,000 smooth cycles. Compare that to the generic 5,000-cycle spiral balances most competitors stick in their jams before they bind and drop.
Standard slim-profile sash locks use tamper-resistant cams for an easy turn. Double hungs feature a molded metal pull handle on the top sash and an integrated lift rail on the bottom.
Spring-loaded latches let both sashes rest partially open for safe nighttime ventilation (standard on solid vinyl finishes).
Factory Window Opening Control Devices limit sash travel to 4 inches for child safety. Need to open the window all the way? Disengage the latch with one hand and it automatically resets the next time you close the sash. Offered on double hung units in White and Almond, and not available on laminate finishes.
Factory half screens come standard with fiberglass mesh and sturdy pull handles. Optional upgrades include ThruVision PLUS® high-visibility mesh or a locking screen for added security.
Function and thermal numbers both matter. Here is how each glass package performs.
Dual-pane system with Low-E glass and argon gas fill. Certified U-factor of 0.27 on HeatSeal® and 0.26 on HeatSeal® Deluxe, with air infiltration of 0.02 cfm/ft² on the DH600, far tighter than the 0.30 industry minimum.
Three panes separated by two gas-filled chambers. Certified U-factor of 0.18 on Triple Deluxe XR15 with argon and 0.16 on Triple Deluxe XR10 with krypton, for maximum cold-weather protection.
Tempered glass for required safety codes near bathtubs and walkways, laminated glass for impact resistance and heavy sound deadening, and obscure textured glass for bathroom privacy.
South Jersey weather has no middle ground. July turns into a humid sauna, while January drops sharp freezes and damp nor’easters right onto the Jersey Shore. Thin glass can’t handle that spread.
Modern glass packs solve this using microscopic metallic layers known as Low-E coatings. Think of these coatings as an invisible heat mirror: in winter, they bounce your furnace heat right back into your living room instead of radiating it outside. Come midsummer, they bounce intense solar heat back into the yard, taking the strain off your air conditioner. Inside the sealed pocket between panes, invisible argon gas acts as an insulating blanket far denser than regular air. Paired with hollow, multi-chambered vinyl profiles that break up exterior thermal pathways, your interior glass stays room temperature to the touch.
Match the window to the house, inside and out.
Standard Euro-White, solid Almond, or one of six interior laminates, including Winchester, Melrose Cherry, Dark Oak and Onyx Black.
Standard Euro-White, plus seven stock colors (Almond, Sandstone, Terra Brown, Cocoa, Basic Brown, Bronze, and Nicol’s Black). Need an exact match for your siding? OKNA sprays custom exterior paint colors on demand.
Euro-White, Almond, Cocoa, Adobe Gray, Antique Brass, Brushed Nickel, and Matte Bronze.
Flat or contoured internal grids between the glass (GBG) for easy cleaning, or Simulated Divided Lites (SDL) with external grids and interior spacers for a traditional look.
The OKNA Eco-Pro | 600 Series is built in double-hung (DH600), slider (SL620) and picture (PW610) configurations. Alongside it we install the full range of styles below, so every opening in your home gets the right unit measured to the precise fraction of an inch.
The neighborhood standard. Top and bottom sashes slide up and down and tilt inward for quick maintenance.
Turn the folding crank handle, and the entire sash swings outward like a small door to scoop up passing breezes.
Crisp horizontal tracks with brass rollers. Perfect over kitchen sinks or behind furniture where cranking a handle gets awkward.
Non-operable glass panels built for wide views, thick daylight, and maximum possible insulation value.
Multiple glass sections built outward into an angled projection, creating a sunny interior ledge for houseplants or morning coffee.
Hinged at the very top. You can leave them cranked open for crisp air during light rain without soaking your hardwood floors.
Mini three-sided glass boxes with side ventilation, built specifically to hold small herbs on your sill year-round.
The Eco-Pro | 600 Series is the OKNA line we carry and install. Here is how it compares with the standard builder-grade vinyl window most South Jersey homes already have.
Specification
Builder-Grade Vinyl
OKNA Eco-Pro | 600 Series
Why It Matters
Frame Design
Thin hollow profile, corners often mechanically fastened
Full 3¼" fusion-welded uPVC frame and sash with beveled colonial exterior, high-density composite reinforcement in the locking sash
Welded corners cannot separate or open a caulk line, and the reinforced sash resists bowing under coastal wind
Sill & Interlock
Flat or shallow sill relying on weep holes that clog
One-piece sloped sill with double dam leg mortised into the jamb, full integral interlock, triple weatherstripping
Water runs off instead of pooling, and chimney-effect drafts stop at the meeting rail
Glass Options
Basic double pane, commonly built on a metal spacer
Dual or triple pane HeatSeal® or SunSeal® with argon or krypton, on the non-metal HeatSeal® warm-edge spacer
A warm-edge spacer keeps the glass edge up to 15.3°F warmer at the sightline, which means far less winter condensation
Air Infiltration
0.30 industry minimum, 0.20 industry average
0.02 (DH600), 0.08 (SL620), 0.01 (PW610)
Lower air leakage is less of your heating bill going out through the frame
Interior Aesthetics
White, sometimes almond
Euro-White, solid Almond, plus six interior laminates including Winchester, Melrose Cherry, Dark Oak and Onyx Black
Match the window to the room instead of settling for white on every opening
Best For
Hitting a price point on a spec house or a rental
South Jersey homes that need slim sightlines, a rigid frame and real coastal wind ratings
You are buying the window once, so the build quality is what you live with
We bring cutaway samples of the 600 Series to every estimate, so you can feel the difference in the frame and the sash instead of taking our word for it. Nine out of ten South Jersey homes we quote end up in this line.
Most OKNA Eco-Pro | 600 Series projects land between $950 and $1,500 per opening installed, depending on size, operating style, glass package and finish. After we measure, you get a single, all-inclusive price per opening based on your home’s exact dimensions. That number covers the entire job: your custom-manufactured OKNA window, tearing out and hauling away the old sashes, insulated rough-opening prep, professional installation, custom aluminum exterior capping, and complete site cleanup. No guesswork, no surprise fees tacked on later.
What Moves the Needle on Price?
Big picture windows or multi-lite configurations require more raw material and heavier structural handling.
Simple double-hungs sit at a lower price point than crank-out casements, awnings, or complex custom bays.
Standard dual-pane with Low-E glass keeps costs down; stepping up to triple-pane with krypton gas fills adds cost while driving down your heating bills.
White vinyl is baseline. Custom exterior paint, textured woodgrain laminates, and brushed nickel hardware adjust the total.
If we pull off your old casing and find rotted framing from years of undetected water leaks, that prep work alters labor hours.
Doing an entire floor or whole home brings down the mobilization cost per opening compared to replacing two drafty bathroom windows.
Two layers of protection: the factory stands behind the window, and we stand behind the install.
OKNA backs every window with a Lifetime Transferable Limited Warranty, and if you sell your home the coverage can transfer to the next owner. Ask us for the current OKNA warranty document and we will walk you through exactly what it covers on your units.
A great window installed poorly will leak, stick, and rot your walls. Because we never sublet our work to transient third-party crews, we back our installation directly. Notice a draft or binding sash three years down the line? Call our office. You deal with us, not an offshore warranty clearinghouse or an untraceable subcontractor.
No random subcontractors in unmarked vans show up at your home. Energy Windows, Doors & More employees handle your project from day one.
We inspect your current jambs, look for hidden moisture damage, listen to what you want to fix, and show you physical OKNA samples. You get an exact, written quote on the spot.
Our lead installer measures every opening to the fraction of an inch so your custom OKNA order slides in tight without huge shim gaps.
OKNA builds your units to your exact specs. We track the order and keep you updated on the factory timeline.
Drop cloths go down on your floors and runners line your halls. We pull the old sashes, clean out the rough opening, insulate the perimeter cavity with low-expansion foam, and seat the new units level and square.
We custom-bend aluminum trim around your exterior brickmold to keep out wind-driven rain, vacuum your sills, and haul away the old trash.
Hiring a contractor is stressful. You are trusting people around your home, your family, and your wallet. Here is why local homeowners call us:
Based right here in South Jersey, we answer our own phones and treat our customers like neighbors.
We have worked through every kind of tricky framing problem South Jersey homes can present.
Real installations, proven track record, and thousands of satisfied local clients.
Our leadership and installers know structural carpentry inside and out.
We cover both product defects and installation labor, so you are never left arguing between the factory and the installer.
Straightforward payment plans that keep your savings account intact while you fix your home.
Independently tested and certified ratings for the OKNA Eco-Pro | 600 Series.
Products in this series have been recognized as Most Efficient of ENERGY STAR 2025, a designation reserved for the top tier of qualifying products.
Certified through the ANSI-accredited Keystone Certification Program against AAMA/WDMA/CSA 101/I.S.2/A440, including annual factory inspections.
AAMA design pressure ratings of R50 on the DH600 double hung, R40 on the SL620 slider and R75 on the PW610 picture window.
Searching for a local crew certified to install OKNA? We work daily across Atlantic, Cape May and Ocean counties:
Towns We Serve
OKNA is an independent manufacturer in Bristol, PA that builds to order and sells only through authorized dealers. Every window and door is certified through the ANSI-accredited Keystone Certification Program against the AAMA/WDMA/CSA 101/I.S.2/A440 standard, with annual factory inspections, and products in this series have been recognized as Most Efficient of ENERGY STAR 2025.
In our experience, absolutely. The Eco-Pro | 600 Series eliminates the bulkiness of standard vinyl and builds structural reinforcement into the sill and the locking sash. You get slimmer sightlines, lower heat loss and balances rated for up to 28,000 cycles. It is also the OKNA line we carry and install.
Most OKNA 600 Series projects land between $950 and $1,500 per opening installed, depending on size, operating style, glass package and finish. Every home in South Jersey has its own quirks, whether that means uneven sills, custom casing or second-story coastal exposures, so we come out and measure your exact openings before quoting. You get a single firm written quote covering the custom-manufactured window, tear-out, insulated install, exterior capping and complete debris cleanup. What we quote is what you pay.
Four things you can feel. A full 3¼-inch fusion-welded uPVC frame and sash instead of thin hollow profiles. A one-piece sloped sill with a double dam leg mortised into the jamb rather than weep holes that clog. High-density composite reinforcement inside the locking sash. And a PowerLift block-and-tackle balance engineered for up to 28,000 cycles, against roughly 5,000 for the generic spiral balances most builder-grade units use. On air infiltration the DH600 tests at 0.02 cfm/ft² versus an industry minimum of 0.30.
You will not find OKNA on a retail shelf. Units are built to order for your exact openings and installed by authorized dealers instead of stocked in standard sizes. On the DH600 that means 0.02 cfm/ft² air infiltration against the 0.30 industry minimum, and an AAMA design pressure rating of R50.
No. OKNA sells exclusively through authorized, trained dealers so units are installed to exact factory standards. Homeowners across Atlantic, Cape May and Ocean counties can schedule directly through Energy Windows, Doors & More.
OKNA backs every window with a Lifetime Transferable Limited Warranty, and if you sell your home the coverage can transfer to the next owner. Ask us for the current OKNA warranty document and we will walk you through exactly what is covered. On top of the factory warranty we back our own installation directly, because we never sublet the work to third-party crews.
Once your custom windows arrive from the factory, our in-house crew wraps up most full-house projects in just one to two days. Because OKNA builds every unit from scratch to match your home’s exact framing, custom fabrication takes a few weeks from the day we place the order. We track the production run directly with the factory and lock in a firm installation date as soon as the delivery window is confirmed.
Stop living with stuck sashes, frosted glass, and cold drafts. Schedule an in-home measurement with our team to explore options and get an exact quote.
OKNA®, Eco-Pro, HeatSeal®, SunSeal®, PowerLift and ThruVision PLUS® are trademarks of OKNA Windows. Product specifications, certifications and performance figures on this page are taken from the OKNA Eco-Pro | 600 Series brochure (9/2025) and OKNA’s published thermal performance data. Certified ratings are tested without grids and vary by unit size and glass package. Energy Windows, Doors & More is an authorized OKNA dealer and is not affiliated with any other window manufacturer.
