Quality you can trust • Code-compliant • Energy efficient
When you're investing in new windows and doors, you want to know they'll perform as promised. Certifications and ratings from independent organizations provide that assurance. They're not just marketing jargon - they're verified standards that help you make informed decisions.
All our windows and doors meet or exceed U.S. building codes and energy efficiency standards. We work with manufacturers who understand that Missouri homeowners need products that perform in both hot summers and cold winters.
The National Fenestration Rating Council (NFRC) is an independent organization that tests and certifies windows, doors, and skylights. Every window we install comes with an NFRC label showing verified performance ratings.
What it means: Measures how well the window prevents heat from escaping your home. Think of it as insulation value.
What to look for: Lower is better. A U-factor of 0.30 or lower is excellent for Missouri homes. Our windows typically achieve U-factors between 0.25 and 0.30.
Why it matters: Better insulation means lower heating costs in winter and more consistent indoor temperatures year-round.
What it means: Shows how much solar heat passes through the window. Expressed as a number between 0 and 1.
What to look for: For Missouri, we typically recommend SHGC between 0.30 and 0.40. This balances heat gain in winter (free heating from the sun) with cooling efficiency in summer.
Why it matters: Proper SHGC selection can reduce your air conditioning costs while still allowing beneficial solar heat in colder months.
What it means: The amount of visible light that passes through the window. Also expressed as a number between 0 and 1.
What to look for: Higher is usually better (unless you want privacy glass). Our windows maintain VT of 0.50 to 0.60, meaning you get plenty of natural light.
Why it matters: Natural light reduces the need for artificial lighting and makes your home feel brighter and more welcoming.
What it means: Measures how much air passes through cracks in the window assembly. Lower is better.
What to look for: The maximum allowed is 0.3. Our professionally installed windows achieve much lower rates, often below 0.1.
Why it matters: Low air leakage means fewer drafts, better comfort, and lower energy bills. Proper installation is crucial here - that's where professional installation makes a huge difference.
In the United States, windows and doors must meet energy efficiency standards set by various codes and programs, including:
Most states, including Missouri, follow IECC standards for residential construction. This code sets minimum U-factor and SHGC requirements based on climate zones. Missouri spans multiple climate zones, so we ensure our products meet the strictest requirements for your area.
Many of our windows and doors carry the ENERGY STAR label, meaning they exceed federal energy efficiency guidelines. ENERGY STAR products can help you qualify for rebates and tax credits while reducing your energy bills.
We work with both European and U.S. manufacturers. Each brings unique strengths, and understanding the differences helps you make the best choice.
Important: Whether we install European or U.S. manufactured windows, we ensure they meet all applicable U.S. building codes and energy efficiency standards. We handle all necessary testing, documentation, and compliance verification - you don't have to worry about it.
Certifications mean independent testing. You're not just taking the manufacturer's word - real performance data backs up the claims.
Properly certified windows deliver the energy savings they promise, reducing your utility bills year after year.
Certified windows ensure your home improvement meets building codes, which is important for permits, inspections, and resale value.
Certified products often come with better warranties because manufacturers stand behind their verified performance claims.
We're happy to explain any ratings, certifications, or compliance requirements. During your free estimate, we'll review the performance data for the windows and doors we recommend for your home.
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