Impact Windows vs Regular Windows: Energy Savings Compared

Most homeowners think of impact windows purely as hurricane protection. But in South Florida's scorching climate, the energy savings alone can justify the investment.

The Science: How Impact Windows Save Energy

Impact windows use laminated glass — two panes bonded with a polyvinyl butyral (PVB) interlayer. When you add Low-E coatings, this construction creates a thermal barrier that dramatically reduces heat transfer.

Key Metrics

Metric	Regular Windows	Impact Windows (Low-E)
U-Factor	1.10-1.20	0.25-0.40
SHGC	0.80-0.90	0.22-0.30
UV Blocking	25%	99%
Sound Reduction	25 STC	35-40 STC

• U-Factor: Measures heat transfer speed (lower = better insulation)
• SHGC: Solar Heat Gain Coefficient (lower = less heat entering your home)

Real-World Energy Savings

A typical 2,000 sq ft home in Miami with regular single-pane windows and an older A/C system might spend $350-400/month on electricity during summer.

After upgrading to impact windows with Low-E glass:

• Cooling costs reduced by 25-30%: That's $87-120/month in savings
• Annual electricity savings: $700-1,000
• A/C runs less: Extends the lifespan of your HVAC system

Beyond Energy: The Hidden Benefits

Noise Reduction

Impact windows reduce outside noise by 35-40 STC (Sound Transmission Class) compared to 25 STC for regular windows. If you live near a highway, airport, or busy street in Fort Lauderdale or Miami, this is life-changing.

UV Protection

Impact windows block 99% of UV rays. This prevents:

• Furniture fading and cracking
• Hardwood floor discoloration
• Artwork deterioration

Security

The laminated interlayer makes impact windows extremely difficult to break through, providing an extra layer of burglary protection even outside of hurricane season.

Upgrade to impact windows and start saving immediately. Get your free Izoah quote — we'll calculate your energy savings potential.