OKNA SunSeal
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Why SunSeal Glass Matters for the Windows in Your Coastal Home
Standard double-pane windows block heat transfer, but they aren’t designed for South Carolina’s coastal climate. That’s why Contract Exteriors installs OKNA SunSeal windows. They combine a low-emissivity (Low-E) coating with solar control technology to reflect heat before it passes through the glass. That means your home stays cooler without sacrificing natural light or outdoor views.
For homeowners, that translates into less reliance on air conditioning during peak summer months and better protection for floors, furniture, and artwork against UV damage. Unlike tinted glass, SunSeal blocks heat while maintaining brightness and clarity. You’ll often notice a difference in comfort within the first cooling season, especially in west-facing rooms.
SunSeal Across the OKNA Window Line
SunSeal is available across OKNA’s full window line, so you don’t have to compromise between style and performance. Whether you need fixed windows, operable vents, or a combination, SunSeal can be incorporated into:
This lets you standardize high-performance SunSeal glass across your home rather than mixing different types of glass from room to room.
Built for Coastal Conditions
Windows along the coast face several unique challenges. Salt air can corrode seals and hardware; wind-driven rain puts glazing integrity to the test; high humidity accelerates moisture infiltration; and intense UV exposure can degrade standard glass and finishes.
SunSeal glass is engineered to handle all of these conditions. Its solar-control coating reduces heat gain, while the sealed insulated unit is built for long-term durability. Many coastal window failures begin at the seal before any visible frame damage appears, and SunSeal’s design specifically addresses this vulnerability to help protect your home over time.
How Contract Exteriors Installs SunSeal Windows
Even the best glass package performs only as well as the installation allows. That’s why our process focuses on precision at every stage:
Window Removal & Opening Prep: Existing windows are removed, and openings are prepared with moisture management in mind.
Shimming & Leveling: Proper alignment ensures optimal performance and prevents air or water leaks.
Flashing & Air Sealing: Every interface is sealed to block wind-driven rain and protect the home envelope.
Final Quality Review: We inspect the installation and document each stage with photos for consistency.
Our 60-step internal process guarantees SunSeal performs as designed, backed by a 7-year workmanship warranty. You can see examples of our completed installations in our project gallery.
Why Coastal SC Homeowners Choose Contract Exteriors
Contract Exteriors is dedicated to giving homeowners the exterior renovations they want and need. Our goal is to keep you protected and feeling secure through every coastal season. Here are some things that set us apart:
Proven Local Experience: Serving the Lowcountry and Grand Strand since 2009.
Award-Winning Service: GuildQuality Guildmaster Award for 10 consecutive years; BBB Torch Award for Ethics three years in a row.
Full Focus on Windows & Doors: We specialize in complete replacements, not partial repairs.
Local Accountability: Two offices (Charleston and Murrells Inlet) mean faster response times and local project oversight.
Common Questions About OKNA SunSeal Windows
SunSeal reflects infrared and UV heat before it enters your home, reducing cooling loads while keeping natural light and clear views.
Yes. The sealed insulated unit is designed for high-humidity and salt-proximate environments, resisting seal degradation better than entry-level windows.
SunSeal is available across our full window line. A consultation will confirm the best configuration for your home.
Contract Exteriors provides a 7-year workmanship warranty. OKNA includes a separate manufacturer warranty, explained during your project consultation.
No. We only provide replacement windows and doors for existing homes. We also do not offer partial-window or repair work.
Your home’s orientation, sun exposure, and goals (energy savings, UV protection, or both) determine if SunSeal is the best choice. A site visit ensures a tailored recommendation.
Yes. Check our project financing and special offers page for current options.
Get an OKNA SunSeal Estimate for Your Coastal Home
Schedule an on-site consultation to review your home’s windows and openings. We’ll evaluate SunSeal’s fit for your sun exposure, discuss costs, and outline the project timeline. Estimates are free and carry no obligation. Contact Contract Exteriors today to get started.
See Our Work Across Your Neighborhood
With over 1,300 completed projects, chances are we’ve worked on a home near you. Click around the map to explore real results.
Outstanding Reviews
Brooks was my contractor on the project. He was awesome! He was there with me every step of the way! Eugenia was very helpful in the office and assisted me in getting the HOA approval. Jason explained the warranty process and even brought me a cake!
Everyone we came in contact with was very cooperative and easy to work with. It was a pleasant experience from the first online chat. They listened to us and helped solve any issues we were concerned about
Wow, this company goes above and beyond. From the very first reach out to the very last interaction once the job was completed. Everything was done first class. The quality of work, the constant communication and level of service was like nothing I’ve ever experienced with any contractor. I priced out a couple different contractors compared to contractor exteriors and I will tell you I would have paid more just to have this experience with them. I had Jonathan as my project manager and he was exceptional.
Very happy with our new Timbetech front porch deck and steps with AZEK facia and risers. Everyone at CE was responsive and very professional explaining every step in detail! We have several homeowners in our community who have already asked for contact info info. Jonathan is a very good project manager and ensured we were satisfied with the quality, cleanliness, and appearance of our new front porch! Thank you!
In choosing a company to replace our deck, we researched and decided to use Contract Exteriors. We definitely made the right choice. We are very pleased with the results. Special thanks to Brooks, our Project Manager, who kept us updated and informed everyday.
Contract Exteriors did a great job for me. The entire group was very responsive, and my deck project turned out fantastic. My project, as all projects, had some surprises that were handled professionally and promptly. Randy, Brooks, and the office staff were great throughout the process. They proactively kept me informed on the status of the project. I never had to call twice to get a question answered or ask for an accommodation.
We couldn't be happier with contract exteriors and the job they did. Our beach house looks brand new with the new Hardie board and white trim. EVERYONE was friendly, well mannered, professional, and was always ready to answer any questions that we had. Miguel and his crew did an excellent job. Brooks the project manager was wonderful, and also Chad who helped us from the very beginning, also the girls in the office. We would not hesitate to use them again.
This company did an amazing job on my siding project. From start to finish they were very professional, helpful, and on time. Eugenia clearly communicated the whole process to me before they even started the project and Brooks was always available to answer my questions. He even came and ensured the cleanup was perfect and finished up the exterior lighting. Even after the project was finished this company ensured communicated to ensure everything was perfect. Super pleased. Thank you!
Everything about this group was extremely professional. Renovations can be challenging but they carefully made sure that their products and our original structures fit together seamlessly. We are truly looking forward to our new elegant deck that will be essentially maintenance free for many, many years. We will definitely use this company for future projects.
Matt Kuzdrall made our whole experience of purchasing two new roofs for our buildings at the Children's Recovery Center so easy. Matt was professional and had all the answers to any questions we had. He has followed up since our new roofs have been installed to make sure everything is still great. Matt is awesome and I would recommend him to anyone I know looking for a new roof.
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