Fiberglass vs Vinyl Windows: Which Is Right for Texas Homes?

Choosing the right replacement windows for your Texas home can feel overwhelming. The two most popular options fiberglass and vinyl windows each offer unique benefits in terms of cost, performance, and appearance.

At Showroom Windows & Doors, we specialize in helping San Antonio homeowners compare these choices side by side. Whether you’re upgrading for energy efficiency, curb appeal, or resale value, understanding the real differences between fiberglass and vinyl windows will help you make the best decision.

What Are Vinyl Windows?

Vinyl windows are made from polyvinyl chloride (PVC), a durable plastic material designed for energy efficiency and low maintenance.

Benefits of Vinyl Windows

• Energy Efficiency – Tight seals prevent air leakage, keeping your home cooler in the Texas heat.
• Low Maintenance – No painting or staining required. Just clean and enjoy.
• UV Resistant – Won’t rot, corrode, or warp from sun exposure.
• Longevity – Often last 20+ years with minimal upkeep.
• Cost-Effective – Typically less expensive to buy and install compared to fiberglass or wood.

Recommended Product: Pella 250 Series Vinyl Windows

At Showroom Windows, we recommend the Pella 250 Series for vinyl replacement. Its thin-profile frame allows more glass and natural light, while Pella’s responsive warranty and service provide peace of mind if issues ever arise.

Average Cost in San Antonio:

A custom 35″ x 70″ double-hung Pella 250 window ranges from $950 – $1,250 installed, depending on factors such as stucco exteriors, interior wood casing, and finishing details.

What Are Fiberglass Windows?

Fiberglass windows are crafted from reinforced glass fibers formed through a pultrusion process. They are known for their exceptional strength, resistance to warping, and ability to handle extreme Texas weather.

Benefits of Fiberglass Windows

• Energy Efficiency – Superior insulation reduces energy bills.
• Durability – Stronger than vinyl; resists warping, rotting, and swelling.
• Heat Resistance – Won’t soften or deform in extreme heat.
• Thinner Frames – More glass area for natural light and better views.
• Moisture Resistant – Ideal for humid or rainy climates.
• Customizable – Can be painted and shaped for architectural flexibility.
• Eco-Friendly – Recyclable and long-lasting.

Recommended Products: Pella Impervia & Marvin Essential Fiberglass Windows

We offer Pella Impervia and Marvin Essential, two of the strongest and most reliable fiberglass lines on the market. Both deliver long-lasting performance, modern design, and premium energy efficiency.

Average Cost in San Antonio:

A custom 35″ x 70″ fiberglass window in either line typically costs $1,900 – $2,300 installed, depending on home conditions like exterior stucco or interior trim.

Vinyl vs Fiberglass Windows: Side-by-Side Comparison

Here’s a side-by-side breakdown for Texas homeowners:

Which Windows Are Best for Texas Homes?

• Choose Vinyl (Pella 250) if you want an affordable, energy-efficient option with reliable warranty support and a sleek thin-frame design.
• Choose Fiberglass (Pella Impervia or Marvin Essential) if you’re looking for long-term durability, premium design, and top-tier energy efficiency that stands up to Texas heat.

Both are excellent investments, but your choice depends on your budget, design goals, and how long you plan to stay in your home.

Replacement Window Costs in San Antonio

• Vinyl Windows (Pella 250): $950–$1,250 installed per custom double-hung unit (varies by stucco, casing, paint, etc.)
• Fiberglass Windows (Pella Impervia or Marvin Essential): $1,900–$2,300 installed per comparable unit
• Specialty Styles (bay, bow, custom shapes): $6,500–$12,500+ installed

💡 Pro Tip: Pairing new windows with doors can reduce overall project costs. Explore our Window Replacement Cost San Antonio Guide for more cost details.

ROI of Fiberglass vs Vinyl Windows

Replacement windows deliver a 65–75% return on investment when selling your home. They also lower utility bills thanks to better energy efficiency.

• Vinyl ROI: Lower upfront cost, faster payback period.
• Fiberglass ROI: Higher lifetime savings, stronger resale value.