Call Now for a Free Estimate! 804-752-0008

NRFC Ratings

Any replacement window you purchase should come with a label from the National Fenestration Rating Council (NFRC). The NFRC is a program established by the U.S. Department of Energy to help consumers compare window products and options. Window manufacturers participating in the program are required to label every window to its specific thermal performance level. Customers are then ensured that the products they select meet the requirements for their application. Participation in the NFRC program is voluntary. Not all manufacturers participate because it requires outside third party inspection and extensive product testing.

The NFRC conducts testing and has established industry standards for rating the energy performance of replacement windows, including:

U-Value
The most important measure of a window’s performance is its U-value. The U-value indicates the rate of heat flow through a window. The lower the U-value, the more energy efficient the window will be. U-value measures the entire window unit — glass, frame, sash, spacers — and is the only measurement accepted by the U.S. Department of Energy’s EnergyStar program.

U-value depends on:

    • Quality of the materials used
    • Type of materials used
    • Engineering and design of the window
    • Quality of assembly

R-Value
R-value is the measure of the resistance of glass to the flow of heat. The higher the R-value, the better the glass will be at insulating your home. But R-value is NOT an accepted form of measurement by the NFRC or EnergyStar, as it does not measure the overall window unit.

Solar Heat Gain Coefficient 
Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat caused by sunlight. The SHGC is the fraction of incident solar radiation admitted through a window and absorbed and subsequently released inward. SHGC is expressed as a number between 0 and 1. The lower a window’s solar heat gain coefficient, the less solar heat it transmits.

Visible Transmittance 
Visible Transmittance  (VT) measures how much light comes through a product. The visible transmittance is an optical property that indicates the amount of visible light transmitted. VT is expressed as a number between 0 and 1.  The higher the VT, the more light is transmitted.

Air Leakage* 
Air Leakage (AL) is indicated by an air leakage rating expressed as the equivalent cubic feet of air passing through a square foot of window area (cfm/sq ft). Heat loss and gain occur by infiltration through cracks in the window assembly. The lower the AL, the less air will pass through cracks in the window assembly.

Condensation Resistance* 
Condensation Resistance (CR) measures the ability of a product to resist the formation of condensation on the interior surface of that product. The higher the CR rating, the better that product is at resisting condensation formation. While this rating cannot predict condensation, it can provide a credible method of comparing the potential of various products for condensation formation. CR is expressed as a number between 0 and 100.

*This rating is optional and manufacturers can choose not to include it.

Get a Free Quote and be Entered to Win a Free Roof!

We Were Totally Pleased

A Plus Roofing recently replaced our roof, and we were very pleased with their professionalism, attention to detail, and the overall quality of the job they did. From the initial quoting process, during which Bill Kain explained how they would do things and the extra things A Plus Roofing would do to make the job look and go well, to the care of the actual workers in protecting everything around our house as they did their work, to the final cleanup of the job, we were totally pleased with our choice in contractors. I plan to use A Plus Roofing for other work on my house in the future (gutters done with roof, siding and window work in the plan), and I will heartily recommend them to all of my friends and neighbors without hesitation. 

– Henrico

Very professional

Very professional. Did exactly what they said they would do. No surprises.

– Hanover

Excellent Experience

The experience with A+ Roofing was excellent. I would recommend this company for their courteous, professional, and efficient service and expertise. We are most pleased with our new roof and the workmanship of the project. The roofing crew was amazing to watch....so hardworking and professional. Mr. Kain was in touch during the whole project and we knew were in good hands. Many thanks! 

- Chesterfield

We Are Very Satisfied

This was our first roofing experience. We checked the company out online and asked the company for references from previous jobs. I talked to two previous customers (1 asphalt roof and 1 metal roof on residential homes) and both couldn't say enough good things about the company, their crews and the quality of their work. We are very satisfied and would definitely recommend them to others.

-Louisa

Would Definitely Recommend!

The team was professional and thorough. The house looks like a completely different house with the beautiful new roof! There was not a speck of debris left in our yard. After the roof was on and the materials were cleaned up, I was impressed to see the workers carefully going around our whole property using giant magnets to pick up any loose nails that may have fallen.  We've had over a foot of snow and several heavy rains and have been very snug under our new roof. Would definitely recommend! 

- Henrico