𝐖𝐡𝐚𝐭 𝐭𝐨 𝐋𝐨𝐨𝐤 𝐟𝐨𝐫 𝐢𝐧 𝐍𝐞𝐰 𝐖𝐢𝐧𝐝𝐨𝐰𝐬

The U.S. EPA partners with the National Fenestration Rating Council (NFRC) to rate the energy efficiency of windows. The NFRC looks at these factors:

• Solar heat gain (SHG). This is the amount of heat from the sunshine that comes through the window when exposed to direct sunlight. Look for low numbers to reduce cooling bills.

• U-factor. This describes the amount of heat the window lets escape through the glass. In this measurement, low numbers are best.

• Visible transmittance. This number indicates how much daylight the glass transmits. Look for higher numbers if you like a bright daytime interior.

• Air leakage. The NFRC identifies how much air could leak through the window. This number excludes leakage due to issues with window installation. If the window itself isn’t tightly fit and sealed, air can leak through it and into your home.

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