Impact Windows Energy Efficiency Florida 2026: Savings, SHGC Ratings & Rebates
Most homeowners know impact windows protect against hurricanes. Fewer realize they can also cut monthly electric bills by $200–$400 per year. The key is choosing the right glass type — specifically one with a low Solar Heat Gain Coefficient (SHGC). This guide covers the energy science, what to look for on the label, and every rebate and incentive available in South Florida in 2026.
Updated: May 2026 | Applies to: Broward, Miami-Dade, and Palm Beach Counties
Impact Windows Do Two Jobs
🌀 Hurricane Protection
Laminated glass holds together on impact — prevents debris penetration and pressure blow-out. Required by Florida Building Code in HVHZ zones. This is what the "impact" refers to.
☀️ Energy Efficiency
Low-E coatings block infrared heat while letting visible light through. Reduces solar heat gain and cuts air conditioning use — the largest part of a Florida electric bill.
Not all impact windows are equally energy-efficient. A basic impact window with clear laminated glass stops debris, but it doesn't significantly reduce heat gain. The difference is the glass coating — specifically whether the glass carries a Low-E (low-emissivity) coating and what its SHGC rating is.
The Two Ratings That Matter in Florida
Every window carries an NFRC label with at least two numbers. In Florida, SHGC is far more important than U-factor — because cooling dominates the energy bill, not heating.
| Rating | What It Measures | Florida Target | Why It Matters |
|---|---|---|---|
| SHGC | Solar Heat Gain Coefficient — how much solar heat passes through the glass (0–1 scale; lower = less heat) | ≤0.23 (ENERGY STAR) | Controls how much of the Florida sun's heat enters your home — directly impacts A/C runtime and electric bill |
| U-Factor | Rate of heat transfer through the window (lower = better insulation) | ≤0.32 (ENERGY STAR) | Matters more in cold climates — still relevant in Florida for night heat loss and A/C efficiency |
⚠️ SHGC Trap: Standard Clear Impact Glass
Standard clear laminated impact glass typically has an SHGC of 0.38–0.55. That's hurricane-safe but energy-inefficient. You're paying for hurricane protection while cooking your home with solar heat. Always ask for the NFRC label and confirm SHGC ≤0.23 for South Florida applications.
| Glass Type | Typical SHGC | ENERGY STAR South Zone | Estimated Annual Savings vs Single-Pane |
|---|---|---|---|
| Standard single-pane (old) | 0.70–0.86 | ❌ Fails | Baseline (no savings) |
| Clear laminated impact (standard) | 0.38–0.55 | ❌ Fails | $50–$150/yr cooling savings |
| Low-E laminated impact (standard Low-E) | 0.25–0.35 | ⚠️ Near threshold | $100–$250/yr cooling savings |
| Low-E impact, ENERGY STAR certified | ≤0.23 | ✅ Qualifies | $200–$400/yr cooling savings |
Savings estimates based on Florida Solar Energy Center data and U.S. DOE research for Florida climate conditions. Actual savings depend on home size, orientation, and existing window baseline.
ENERGY STAR Certification for Florida Windows
Florida falls in the Southern climate zone under ENERGY STAR Version 7.0 — the warmest and most solar-intensive zone in the program. Requirements are stricter here than in northern states precisely because solar heat gain is the dominant energy problem.
ENERGY STAR Southern Zone Requirements (Florida)
Windows
- U-factor: ≤0.32
- SHGC: ≤0.23
Doors (with >½ glass area)
- U-factor: ≤0.32
- SHGC: ≤0.23
ENERGY STAR certification is a floor, not a ceiling. Some Low-E impact glass products achieve SHGC as low as 0.18–0.19 — meaningful additional savings for south- and west-facing windows that take the most direct sun.
PGT WinGuard, ESW, and Mr. Glass all offer ENERGY STAR certified configurations in their product lines. Always specify Low-E with ENERGY STAR when ordering and confirm the NFRC label before installation.
How Low-E Glass Works (Plain English)
Low-E stands for low-emissivity. A microscopically thin metallic coating — invisible to the eye — is applied to one surface of the glass during manufacturing. This coating:
- Reflects infrared heat outward before it enters the home — this is what lowers the SHGC. The Florida sun's infrared energy bounces back instead of heating your living room.
- Allows visible light through — your home doesn't get darker. Low-E glass transmits most of the visible spectrum while rejecting heat.
- Reduces U-factor — at night, the coating also reflects indoor heat back in, reducing heat loss through the glass surface.
Impact glass construction (typical ENERGY STAR product):
Exterior glass (tempered) → PVB laminate interlayer → Interior glass (with Low-E coating on surface 2 or 3)
The PVB interlayer provides the impact protection. The Low-E coating provides the energy efficiency. Both are required to be both safe and efficient.
How Much Can You Actually Save?
The honest answer depends on what you're replacing. The worse your current windows are, the more you save. A typical South Florida home replacing single-pane clear windows with ENERGY STAR Low-E impact glass:
| Home Size | Windows Replaced | Estimated Annual Savings | Payback Contribution |
|---|---|---|---|
| 1,200 sq ft condo | 6–8 windows | $120–$200/yr | Adds to insurance savings |
| 1,800 sq ft home | 10–14 windows | $200–$320/yr | Significant combined savings |
| 2,500 sq ft home | 16–22 windows | $280–$400/yr | Substantial — compounds with insurance discount |
| 3,500+ sq ft home | 24+ windows | $350–$550+/yr | Fastest payback on energy alone |
Based on Florida Solar Energy Center research and DOE data. Savings assume replacement of single-pane clear glass with ENERGY STAR Low-E impact glass, South Florida climate zone.
The Full Savings Picture
- ⚡ Energy savings: $200–$400/yr on cooling
- 🏠 Insurance savings: 25–45% off windstorm premium (often $800–$2,500/yr)
- 📈 Home value increase: 7–10% premium on sale price in South Florida
- 🔇 Noise reduction: PVB laminate reduces exterior noise by 25–40%
- 🌞 UV protection: Low-E blocks 99% of UV — protects furniture, flooring, artwork
2026 Rebates & Incentives for Energy-Efficient Impact Windows
⚠️ Federal Tax Credit (25C): Expired End of 2025
The Energy Efficient Home Improvement Credit (IRS Section 25C) — which offered 30% back up to $600 for qualifying windows — expired at the end of 2025. For windows installed in 2026, no federal income tax credit is currently available. Check IRS.gov for any legislative updates.
My Safe Florida Home Grant
✅ Active 2026The State of Florida's primary home hardening program. Matches $2 for every $1 the homeowner spends on qualifying improvements — including impact windows, impact doors, and hurricane garage doors. Maximum grant: $10,000 (covering up to $15,000 in project cost).
- • Eligibility: Primary residence, homesteaded, insured, value ≤$700,000
- • Requires a free wind mitigation inspection first
- • Apply at mysafeflhome.com — funding is appropriated annually; apply early
Duke Energy Florida Rebate
✅ Active — verify availabilityDuke Energy Florida offers $4 per square foot of qualifying window area, up to $800, for east-, west-, and south-facing windows that meet ENERGY STAR efficiency requirements. Must be a Duke Energy Florida residential customer.
- • Apply after installation at duke-energy.com
- • Requires ENERGY STAR certified product documentation
- • FPL and other utilities may offer similar programs — check your provider's website
Insurance Premium Savings
✅ Immediate after wind mitigation inspectionNot a rebate — but often the largest single financial benefit. Installing impact windows on all openings qualifies your home for the maximum wind mitigation credit. Florida homeowners in Broward and Miami-Dade report windstorm premium reductions of 25–45% — typically $800–$2,500 per year.
- • Requires wind mitigation inspection ($75–$150) after installation
- • Inspector certifies opening protection type to your insurer
- • Discount applies even without ENERGY STAR — any NOA-certified impact product qualifies
PACE Financing (Property Assessed Clean Energy)
💳 Financing option — not a grantPACE financing is available in all three South Florida counties. It lets you finance impact window installation at $0 down, with repayment added to your annual property tax bill. Terms typically run 5–25 years.
- • No credit score requirement — secured by property
- • Interest rates vary (typically 5–9%)
- • Transfers to the next owner with the property — not all buyers want this, can affect sale
- • Available through Ygrene, HERO, and Benji PACE programs
How to Order the Right Energy-Efficient Impact Windows
When getting quotes, confirm these four things explicitly:
Ask for ENERGY STAR certified product
Specify that you want ENERGY STAR certified glass for the Southern climate zone — U-factor ≤0.32 and SHGC ≤0.23. Not all contractors default to this; some install the least expensive clear impact glass.
Request the NFRC label
Every window should have a National Fenestration Rating Council (NFRC) label with U-factor, SHGC, VT (visible light transmittance), and AL (air leakage). Verify SHGC is ≤0.23 before ordering.
Prioritize south- and west-facing windows
These orientations receive the most direct afternoon sun. Investing in the lowest SHGC glass on these sides has the highest energy payback. East windows can use slightly higher SHGC without major penalty.
Get documentation for rebates
Keep the NFRC label, ENERGY STAR certification sheet, and product spec sheet. You'll need these to apply for the Duke Energy rebate and to document the installation for future sale or insurance purposes.
Frequently Asked Questions
Do impact windows lower electric bills in Florida?
Yes. Low-E impact windows with a low SHGC block solar heat gain and reduce cooling load significantly. Florida homeowners report $200–$400 per year in cooling savings after replacing single-pane or clear-glass windows with ENERGY STAR certified Low-E impact glass. Total utility bill reduction typically runs 12–33%.
What SHGC should impact windows have in Florida?
Florida is in the Southern ENERGY STAR climate zone. To earn the ENERGY STAR label, windows in this zone must have a Solar Heat Gain Coefficient (SHGC) of 0.23 or lower and a U-factor of 0.32 or lower. A lower SHGC means less solar heat enters the home — critical for reducing A/C use in Florida's hot climate.
Is there a federal tax credit for impact windows in 2026?
No. The federal Energy Efficient Home Improvement Credit (25C) expired at the end of 2025. For windows installed in 2026, there is no federal income tax credit available. Florida homeowners can instead pursue the My Safe Florida Home matching grant (up to $10,000) and utility company rebates.
What is the Duke Energy rebate for windows in Florida?
Duke Energy Florida offers a rebate of $4 per square foot of qualifying window area, up to $800 total, for east-, west-, and south-facing windows that meet ENERGY STAR efficiency requirements. You must be a Duke Energy Florida customer and apply after installation.
What is the difference between Low-E and standard impact glass?
Standard impact glass is clear laminated glass — it stops debris but does not significantly reduce heat gain. Low-E impact glass adds a metallic coating that reflects infrared heat, reducing solar heat gain (lower SHGC) and improving insulation (lower U-factor). In Florida, Low-E glass can cut cooling energy use by 25–40% compared to clear impact glass.
Do impact windows qualify for the My Safe Florida Home grant?
Yes. Impact windows are one of the primary qualifying improvements under the My Safe Florida Home program. The grant matches $2 for every $1 the homeowner spends, up to $10,000 total, for improvements that improve wind resistance — including impact windows, impact doors, and hurricane garage doors.
Get ENERGY STAR Impact Windows — In Stock Now
Vieser Construction installs PGT WinGuard, ESW, and Mr. Glass — all available with ENERGY STAR Low-E glass for the Southern climate zone.
In-stock inventory at 30–60% below retail. Free estimate — we handle permits, NOC, and scheduling.