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Warranty
Performance
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WELCOME TO A BETTER EXPERIENCE
Experience The Window Source Difference
Window Quality
Window frames and sashes come steel reinforced for added strength, durability and security. An upgrade for some companies but standard with us.
- •Steel-reinforced frames & interlocking locks for maximum strength and security
- •Cardinal Glass Industries Low-E 366 glass for superior heat rejection and comfort
- •ENERGY STAR® “Most Efficient” certified for 2024 & 2025
- •Advanced insulation system (multi-chamber frames + 1/2" spacer + warm edge technology)
- •Customers report saving up to 30% on energy bills
Sound Insulation
Enjoy peace and quiet with advanced sound-dampening technology that blocks out unwanted neighborhood and street noise.
- •STC 33 rating vs standard 28 for noticeably quieter interiors
- •Sound performance close to an insulated wall (STC ~35)
- •Dual-pane glass (3/16" + 1/8") disrupts sound waves more effectively
- •Argon gas + 1/2" airspace reduces sound and improves insulation
- •Airtight seals & reinforced frames block noise from gaps and vibration
Premium Installation
Our factory-trained experts ensure a perfect fit and flawless finish, guaranteeing maximum performance and energy efficiency.
- •Master Installer certified, in-house crews (no subcontractors)
- •Precision install: every window leveled, squared, and sealed correctly
- •30-year OSI® exterior caulking for long-lasting weather protection
- •Full insulation and airtight sealing to prevent drafts and energy loss
- •In-house service and support—no third parties, ever
Lifetime Warranty
Rest easy knowing your investment is protected by our comprehensive double lifetime warranty on all installations.
- •Full double lifetime coverage for as long as you own your home, fully transferable to the next homeowner
- •$0 out-of-pocket repairs with parts, installation, and future labor all covered
- •Includes seal failure, accidental glass breakage, and all mechanical components like locks and balancers
- •Covers cracking, peeling, and corrosion on window frames inside and out
- •Installed and serviced by in-house, master-certified teams with no subcontractors
Flexible Financing
Upgrade your home today with our easy and affordable financing options designed to fit almost any budget.
- •Multiple financing options designed to fit different budgets and financial goals
- •24 Months Same As Cash with 0 down, 0% interest, and no minimum monthly payments
- •Industry-leading 72 month 0% interest financing with low monthly payments
- •12-year financing at just 2.99% interest with no prepayment penalties
- •Financing helps homeowners upgrade now while improving energy efficiency, comfort, and home value
GET A FREE ESTIMATE
Upgrade Your Home Today
FROM THE SOURCE
The Window Source Way
Locally Owned & Operated – Committed to Our Community
At The Window Source of San Antonio & Austin, we're more than just a window company – we're your neighbors. As a locally owned and operated business, we take pride in serving our community with high-quality, energy-efficient windows at an affordable price.
Unlike big national chains, we understand the unique needs of Texas homeowners and provide personalized service with a local touch. When you choose us, you're supporting a business that reinvests in the community, values honesty and integrity, and is always just a phone call away. Better service, better quality, better value – right here in San Antonio!
WHY CHOOSE US?
#1 Window Company in San Antonio
At The Window Source of San Antonio, we take pride in providing you with the finest quality window replacement, door replacement, siding replacement available in San Antonio. Our lifetime warranty gives you peace of mind, knowing that your investment is protected for life.
We are licensed and insured, and prioritize on delivering exceptional customer service and a stress-free experience from beginning to end. Unlike other contractors who use high-pressure sales tactics, we believe in honesty and integrity above all else. That's why we offer free in-home consultations to help you make informed decisions about your project.
Call us today at (210) 796-9574 to schedule your free in-home consultation.
OUR CLIENTS
Trusted By 2000+ San Antonio
Families
Victor Jones
2025-07-17Alex and his crew did a phenomenal job installing energy efficient windows to our home of 21 years. I highly recommend Alex and Window Source...
Joyce Jones
2025-07-17Alex and his crew did an excellent job on replacing our 13 windows. It was all done within a day. The windows are very impressive...
Maria Abrego
2025-07-09I had a great experience with Chris, first phase, and Alex, second phase, of my home's window installation. They, along with their crew...
Jessica P
2025-07-08Alex and Raul's attention to detail during installation was refreshing. It's hard to find reliable people who are willing to meet a high standard...