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Window Consumer Infomation

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Current Board Posts

  • Friday October 17, 2014

    Zen equivalents

    I contacted Soft-Lite, and they provided a dealer that offers Zen windows, which I'm told is the private label for Soft-Lite. While...

  • Thursday October 16, 2014

    Energy Wall by Polaris?

    I have been researching windows for awhile now and I just came across the energy wall window which I believe is made by...

  • Wednesday October 15, 2014

    AAMA MFG CODE

    I am trying to assist a homeowner locate the correct door manufacture, does anyone recognize the AAMA Mfg code MLB-1
    Thank You in...

  • Tuesday October 14, 2014

    Soft Lite Imperial LS - mold? Dirt?

    We had soft lite imperial LS installed 12/31/13. I have cleaned them 2x. Most face due east and receive pretty good...

  • Monday October 13, 2014

    Looking for comparison of Alside Mezzo vs Simmonton 6500

    Can anyone tell me which window is better? I have been given quotes on both of the above that are almost identical....

  • Sunday October 12, 2014

    (1) Hail damage, (2) Denver afternoon sun

    This board is very helpful, thanks! I have two questions.
    1) We recently had hail damage, and our screens...

  • Friday October 10, 2014

    HAYFIELD BRAND WINDOW QUESTION

    Has anyone heard of Hayfield brand windows - a Minnesota company? Any information as to quality/rating would be...

  • Thursday October 9, 2014

    contacts in Indianapolis area?

    Hello all -
    I'm looking to replace 9 old wood windows with vinyl and I was wondering if any of the experts on...

  • Monday October 6, 2014

    Mezzo windows from Alside

    I think that is the name. My question to the pro's is, did they discontinue the Excalibur and make something a little better...

  • Sunday October 5, 2014

    bay crank out window help

    I have a 1958 4window bay.... 2 crank out. The cranks are broken and cannot be replaced too old. Do I...

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Do it Yourself- Replacement Window Video

 

Rating Window Efficiency Systems

 

When looking at different models of windows you want to be cognizant of the rating that the manufacturer applies. That rating will either be a “U Value” which gives an indication of that windows tendency to transfer heat either in or out, or by an “R Value” which describes the windows resistance to transferring heat in or out.

U-Values are a measure of heat conductance

R-Values are a measure of heat flow resistance

 

If a window's R-value is high, it will lose less heat than one with a lower R-value. Conversely, if a window's U-value is low, it will lose less heat than one with a higher U-value. In other words, U-values are the reciprocals of R-values (U-values = 1/R-value). NOTE: Most window manufacturers use R-values in rating their windows.

Usually, window R-values range from 0.9 to 3.0 (U-values range from 1.1 to 0.3), but some highly energy-efficient exceptions also exist.

When comparing different windows, you should ensure that all U- or R-values listed by manufacturers:

  • Are based on current standards set by the American Society of Heating, Refrigeration, and Air-conditioning Engineers (ASHRAE)
  • Are calculated for the entire window, including the frame, and not just for the center of the glass
  • Represent the same size and style of window

5 factors affecting the R-value of windows

  1. The type of glazing material (e.g., glass, plastic, treated glass)
  2. The number of layers of glass
  3. The size of the air space between the layers of glass
  4. The thermal resistance of conductance of the frame and spacer materials
  5. The "tightness" of the installation (i.e., air leaks-- see previous discussion).