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Replacement Window Energy Efficiency In Denver, Made Easy To Understand

If You Understand Miles-Per-Gallon For Your Car, You Can Understand Energy Efficiency For Windows

little boy in glasses EurekaAlmost everything homeowners need to know about replacement window energy efficiency in Denver can be found on the NFRC label. The label shows—in black and white—the exact level of energy performance of a window. The number indicates the rate of heat flow through the entire window, including the glass, frame, sash, and spacers. It is the ONLY measurement accepted by the US Department of Energy’s Energy Star program.

What Makes A Window Energy-Efficient?

diagram showing how the design of a replacement window makes it energy efficient
diagram showing how the design of a replacement window makes it energy efficient
diagram showing how the design of a replacement window makes it energy efficient

  • Glazing: Coatings that filter solar radiation and resist heat flow.
  • Frame: The material used in the air pockets in the frame will greatly influence efficiency.
  • Spacers: Spacers keep the glass panes from touching the frames. Insulating spacers are best.
  • Gas Fill: Windows that have argon or krypton gas between the panes will insulate better than plain air.
  • Panes: Double pane windows insulate well; triple panes insulate even better.

How To Read an NFRC Label To Determine a Window’s Energy Efficiency

Example of an NFRC label from a casement window

Out of these ratings, the two most important for Denver-area homeowners to consider are U-Factor and Solar Heat Gain Coefficient (SHGC). Think of these two ratings like the “miles per gallon” rating on your car. Similar to how MPG tells you how fuel-efficient a car is, both U-Factor and SHGC tell you how energy efficient a window is.

Here is more info about the ratings on an NFRC label:

  • U-Factor: U-Factor measures the rate of heat loss on a scale of 0 to 1. The lower the U-Factor, the greater a window resists heat flow. In colder climates (like Denver), it is crucial that your windows have a LOW U-Factor, or they won’t keep your home warm! The acceptable U-Factor for windows in Denver is between 0.27 (or less) and 0.30.
  • SHGC: SHGC measures the fraction of solar radiation admitted through a window on a scale of 0 to 1. The lower the number, the better. While not as important as U-Factor for Denver homeowners, SHGC can impact your home’s energy use during the summer months. A good SHGC rating for windows in Denver is between 0.32 (or less) and 0.42.
  • Visible Transmittance: Visible Transmittance indicates the amount of visible light transmitted from a window. Numbers between 0 and 1 are possible, with numbers in most windows measuring between 0.3 and 0.7. The higher the VT rating, the more light will come through.
  • Air Leakage: Air Leakage (AL) measures how much air will enter a room through a square foot of window. Lower numbers means fewer drafts. The rating is expressed on an NFRC label from 0.1 to 0.3. 0.1 is considered outstanding; 0.2 is good; 0.3 is average; 0.4 or higher is unacceptable.
  • Condensation Resistance: Condensation Resistance is the capability of a window to resist condensation on the interior surface. Higher numbers are desired for Condensation Resistance and are expressed between 1 and 100. 50 or less is substandard; 50 to 60 is good; 60 or more is very good.

Get An Online Quote On Denver’s Most Energy Efficient Windows

Selecting energy efficient replacement windows can significantly contribute to your quality for the coming decades. That’s why choosing the best brand is so important.

At Zen Windows Denver, we offer three exclusive lines of award-winning energy efficient vinyl replacement windows. Here is why Denver homeowners choose our windows…

  • Our windows have won the Energy Star award multiple years in a row. This means our windows are THE most energy efficient replacement windows you can get for your home.
  • Our windows include all of the energy efficient components you need to help keep your home a comfortable temperature and your energy bills lower. These components include double and triple pane glass, foam insulation inside the frame, and special glazed and gas-infused glass.
  • Even our most modestly priced windows come with state-of-the-art energy efficient components, including double-insulating Low-e glass and wool-pile weather stripping. You get amazing efficiency, regardless of which line you select.

Contact us online for a free online quote on replacement windows in Denver. Getting a quote with us is easy, painless, and fast. You’ll get the information you need about the best windows for your home… with ZERO pressure, pricing games, and obligation.

Get a Hassle-Free Quote on your New Windows