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Current Board Posts

  • Tuesday September 2, 2014

    Sunrise Sliders

    I'm considering having sunrise windows installed to replace some relatively large double casements that are to far gone. I would like to replace...

  • Sunday August 31, 2014

    how to compensate the difference in the depth of the window?

    I need to replace an old NORCO window. I carefully made required measurement and now I have a new vinyl window that is...

  • Saturday August 30, 2014

    Soft-Lite and Okna quotes in Central Ohio

    Hello everyone. I am in the market to replace 10 aluminum (awful) windows in the Central Ohio area, so using the advice from...

  • Saturday August 30, 2014

    Stanek Windows

    Had a company come out and show me Stanek Windows. Looks solid, anyone care to...

  • Saturday August 30, 2014

    Okna 500 vs. Simonton Impressions 9800

    Dear all:
    I am trying to make a decision between Okna 500 vs. Simonton Impressions 9800 to replace my 8 double hungs. I...

  • Thursday August 28, 2014

    Harvey Tribute vs. Paradigm

    Getting quotes for replacement windows. Considering Harvey Classic or Havery Tribute or Paradigm. Would love to hear feedback on which is better. It's...

  • Monday August 25, 2014

    Replacement Vinyl window Sound reduction

    Im replacing 3 windows in my master bedroom. Im trying to reduce the most sound possible of kids and dogs from neighbors....

  • Monday August 25, 2014

    1950's Pella strap hinges

    hey y'all im a former installer but now a homeowner with old pella casements. about 1955. I have 2 windows that need the...

  • Friday August 22, 2014

    Windows switched

    I need some advice if you please. I bought Simonton 5050 reflections windows from a contractor in Dallas, TX.
    I have the...

  • Friday August 22, 2014

    slocomb Vs Ideal majestic

    I have two quotes for Ideal majestic and Slocomb, both double hung, double pane, but Ufactor on ideal is .23 while Ufactor on...

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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).