Energy Efficient and Impact Windows
Stop paying to heat the outdoors. KRC Roofing & Siding installs energy-efficient windows that keep your home warmer in winter, cooler in summer, and quieter year-round, with impact-resistant options for extra protection.
Schedule a Free Window Estimate
Comfort and Savings Start at Your Windows
Old, drafty windows are one of the biggest sources of wasted energy in a home. In a Dubuque winter, you can feel it: cold air near the glass, frost on the inside of the panes, rooms that never warm up, and a furnace that runs constantly. In summer, the sun pours heat through single-pane or worn-out glass and your air conditioner can’t keep up.
Today’s energy-efficient windows are a different story. With advanced glass coatings, insulating gas fills, and tightly sealed frames, they dramatically reduce heat loss and gain. At KRC Roofing & Siding, we help you choose the right windows for your home and budget, then install them with the airtight details that make the efficiency real.
Signs You Need Energy-Efficient Windows
Drafts you can feel near closed windows.
Condensation or frost on the inside of the glass.
Fog or moisture trapped between the panes (a failed seal).
High heating and cooling bills.
Rooms that are too hot or too cold compared to the rest of the house.
Single-pane or very old windows.
Windows that are hard to open, close, or lock.
Outside noise that’s easy to hear indoors.
What Makes a Window Energy Efficient?
Low-E Glass Coatings
Microscopically thin coatings reflect heat back into your home in winter and block solar heat in summer, while still letting in natural light.
Double and Triple-Pane Glass
Multiple layers of glass with insulating space between them slow heat transfer. Triple-pane windows add extra insulation and noise reduction, ideal for Iowa’s coldest months.
Argon and Krypton Gas Fills
Dense, clear gases between the panes insulate better than air.
Warm-Edge Spacers
Insulating spacers between the glass reduce heat loss and condensation at the edges of the window.
Insulated Frames
Vinyl, fiberglass, and composite frames with insulated chambers stop heat from escaping through the frame itself.
Tight Weatherstripping and Seals
Multiple seals keep drafts and air leaks out.
Understanding Window Energy Ratings
Every quality window carries an NFRC label that tells you how it performs. Here’s what to look for:
- U-Factor: how well the window keeps heat in. Lower is better, which matters most in Iowa’s cold winters.
- Solar Heat Gain Coefficient (SHGC): how much solar heat comes through the glass. Lower numbers block more heat.
- Visible Transmittance (VT): how much natural light passes through. Higher means brighter.
- Air Leakage: how much air passes through the window assembly. Lower is better.
- ENERGY STAR® Certification: windows that meet ENERGY STAR criteria for the Northern climate zone, which includes Iowa, are designed for cold-weather performance.
Impact-Resistant Windows for Added Protection
Impact windows use laminated glass, two layers of glass bonded with a tough interlayer. If the glass is struck, it may crack, but it holds together in the frame instead of shattering. In Iowa, that means real benefits:
Hail and Storm Protection
Severe storms with hail and flying debris are a fact of life in eastern Iowa. Laminated glass is much more resistant to breaking and keeps the weather out if it’s hit.
Security Against Break-Ins
Laminated glass is far harder to break through, which adds a strong layer of security for ground-floor and basement windows.
Noise Reduction
The laminated layer dampens sound, a great choice for homes near busy streets or highways.
UV Protection
The interlayer blocks most UV rays, helping protect furniture, flooring, and artwork from fading.
Our Custom Window Process
Free In-Home Consultation
We assess your current windows, talk about comfort and energy goals, and show you options.
Measurement and Recommendations
We measure every opening and recommend the right glass, frames, and styles.
Clear Estimate
You get itemized pricing, including performance ratings for each option.
Ordering and Scheduling
We order your windows and schedule installation.
Professional Installation
We remove the old windows, repair the openings, and install, insulate, flash, and seal the new ones.
Final Walkthrough and Cleanup
We test every window and leave your home clean.
Energy Efficient and Impact Window FAQs
How much do energy-efficient windows cost?
The price depends on the window size, style, frame material, glass package (double vs. triple pane, Low-E, gas fill), and installation needs. We provide a free, itemized estimate with performance ratings for each option.
How much can new windows save on energy bills?
Savings depend on your current windows, home size, and heating and cooling system. Homes replacing single-pane or very old windows typically see the biggest improvement in comfort and energy use.
Are triple-pane windows worth it in Iowa?
For many Iowa homes, yes, especially on north-facing walls, in bedrooms, and in homes near noisy roads. Triple-pane glass offers better insulation and sound reduction. High-quality double-pane windows with Low-E and argon are also a strong, cost-effective choice.
What does ENERGY STAR certified mean?
ENERGY STAR certified windows meet performance criteria set by the U.S. EPA for a specific climate zone. Iowa is in the Northern zone, where windows are rated for strong cold-weather performance.
What are impact windows, and do I need them in Iowa?
Impact windows use laminated glass that holds together if it’s struck. While they’re best known for hurricane areas, in Iowa they’re valued for hail resistance, break-in protection, and noise reduction.
Why do my windows have condensation on the inside?
Interior condensation usually means the glass surface is cold, which is common with older single- or double-pane windows. Moisture between the panes means the seal has failed. Energy-efficient windows with warm-edge spacers greatly reduce condensation.
How long does window replacement take?
Most homes can be completed in one to two days once the windows arrive, depending on the number of windows.
Ready for a Warmer, Quieter Home?
Call (563) 217-5193 or schedule your free window estimate today.