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  • Thursday April 17, 2014

    New windows and a thicker wall

    I've got a house in the Albuquerque, NM area that needs new windows. The ones it has are old aluminum double-paned ones that...

  • Wednesday April 16, 2014

    Trying to decide between options available in my area

    I need some help looking at the options for vinyl replacement windows in my area and just found this site, thought would be...

  • Monday April 14, 2014

    NT Windows

    Is anybody familiar with NT windows? Would appreciate any info you could give me about them and if they manufacture a quality product.

  • Tuesday April 8, 2014

    Hayfield Casement Windows

    In Illinois in my area, Richards Building Supply is where contractors go to buy Hayfield. Hayfield makes wood and vinyl casements. I may...

  • Sunday March 30, 2014

    Norandex Extreme Window

    Does anyone know anything about the Norandex Extreme vinyl windows? Who is making the window for them? Thank...

  • Sunday March 30, 2014

    Double Hung balancing system

    Spiral, block & tackle, and constant force are the three types used to open and close double hung windows. The premium windows...

  • Wednesday April 2, 2014

    Super spacer low e glass

    Well...you better stick around to explain it to the rest of dummies then... :lol:

  • Wednesday April 2, 2014

    Selecting replacement windows...

    Good deal and great window.
    Keep us posted how it goes.
    We love to see follow up on how the project...

  • Sunday March 23, 2014

    window installer

    We are looking to replace windows and sliding glass door in our home in the Osceola,Mishawaka Indiana area.In need of a reputable contractor...

  • Tuesday March 18, 2014

    window world

    Hey All, Am replacing old windows and need some advice. Are the window world new series 4000 windows a good window. the u...

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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).