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Metrics to Consider When Assessing Window Performance

Upgrading your windows is one of the best ways to improve your home’s energy efficiency. To get the most out of your investment, however, you first have to assess their performance. For this, you need to learn about certain metrics that are in place to help you compare products and make informed purchases. Renewal by Andersen® of Memphis, one of the top local window installation companies, discusses four energy performance ratings to consider.

 Assessing Window Performance

U-Factor

The U-factor measures the amount of heat inside your home that can escape through a window. The lower its value, the more the window is capable of resisting heat flow and providing greater insulation for your home. It shouldn’t be confused with the R-value, which measures the effectiveness of insulation in your home’s energy envelope, including the walls, flooring and anything that acts as a barrier separating the indoors and outdoors.

Solar Heat Gain Coefficient

The SHGC is a rating that measures the amount of solar radiation admitted through a window—either transmitted directly or absorbed and subsequently released as heat indoors. Energy-efficient windows with low SHGC ratings work better in homes situated in hot climates because of how they prevent rooms from overheating, especially in the afternoon.

Air Leakage

This rating measures the volume of air that can penetrate a home through a window. It might be an optional rating unlike the U-factor and SHGC, but it is nonetheless an important metric because it indicates how airtight a window is.

Visible Transmittance

This rating measures the ability of the window glazing to transmit sunlight into a home. Windows with a high VT rating may reduce your dependence on artificial lighting. Reflective coatings are also applied on the glass surfaces to keep out unwanted heat while still allowing natural light to enter your home.

At Renewal by Andersen of Memphis, we can help you find high-quality replacement windows for your home. Learn more about our ENERGY STAR® windows by calling (901) 979-4460. You can also fill out our contact form to schedule a free consultation.

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Reviews

"I had an excellent group of installers come out to install my windows. Very professional and went out of their way to make sure everything was to my satisfaction. Would recommend these installers to anyone."

Chuck Walker
Nov 27, 2023

"I can't say enough about Renewal by Andersen. From our initial sit down with the salesman to the final touches being put on our new windows, the whole experience was great! The windows look amazing & the installers were very careful to keep everything clean & cause minimal disruption in my home. Yes, they may be a little expensive, but you pay for what you get. These are quality windows installed by trained professionals. Communication was great & time frame was faster than i expected. They really deliver! I literally had nothing to worry about accept writing the check. I would strongly recommend this company to others! And I'll be calling them back out in the Spring to replace the last 3 windows on my house!"

Savanna Jayne
Nov 9, 2023

"Very professional, actually came a week earlier than expected, cleaned up during and after job, and we love our windows!"

Tommy Tipton
Nov 3, 2023

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