The 30-Second Verdict
Fiberglass is the premium choice for stability and longevity in Florida heat; vinyl is a solid value for most homes with a wide contractor network.
Head-to-Head Breakdown
Fiberglass Windows
Pros
- Doesn't expand/contract with Florida temperature swings
- Can be painted to match any exterior
- Longer lifespan
- Stronger — thinner frames, more glass area
Cons
- Costs 30–50% more than vinyl
- Fewer contractors install fiberglass
- Heavier — can complicate installation
Vinyl Windows
Pros
- Much more affordable
- Widely available — many Florida contractors offer vinyl
- Low maintenance
- Good energy performance for the price
Cons
- Can warp slightly in sustained 95°F+ Florida heat
- Cannot be repainted if color fades
- Thicker frames = less visible glass area
- Lower end products may not hold up in coastal air
Side-by-Side Comparison
| Fiberglass Windows | Vinyl Windows | |
|---|---|---|
| Cost (per window installed) | $600–$1,200 | $350–$800 |
| Material | Glass fiber + resin | PVC plastic (uPVC) |
| Heat Expansion | Very low — similar to glass | Higher — can warp in extreme Florida heat |
| UV/Color Stability | Excellent — holds color long-term | Good but can fade/yellow over 15–20 years |
| Energy Efficiency | Excellent — low thermal transfer | Very good — better than aluminum |
| Impact Options | Available with laminated glass | Available with laminated glass |
| Lifespan | 50+ years | 20–40 years |
| Maintenance | Minimal — can be painted | Wipe clean — cannot be repainted |
Frequently Asked Questions
Do Florida building codes require impact windows?
In wind-borne debris regions (most of coastal Florida), new construction and replacements in designated areas require impact-rated windows or storm shutters. Check your county's requirements.
Are PGT and CGI windows fiberglass or vinyl?
PGT's WinGuard line is aluminum-framed; their Eze-Breeze and some series are vinyl. CGI is aluminum. For fiberglass in Florida, look at Marvin, Integrity, or Pella Impervia.