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Current Board Posts

  • Wednesday July 23, 2014

    New here..

    For the hair we have such a number of errors, so that everyone after the hair under normal circumstances are rarely touch the...

  • Tuesday July 22, 2014

    Okna 700 casement vs Soft-Lite imperial LS and Elements

    Hello everyone,
    I am in the Elma/East Aurora, NY area (around Buffalo NY). I need to replace nine old Pella casement windows...

  • Sunday July 20, 2014

    Republic Window - pane removal?

    Hello,
    I have a two-pane window, one fixed, one sliding, and I can't for the life of me figure out how to remove...

  • Tuesday July 15, 2014

    MI Windows & Doors

    Are these any good? They seem to be very popular in my neck of the woods of New Mexico. Their performance numbers seem...

  • Tuesday July 15, 2014

    Patio doors with the lowest air infiltration

    Does anyone know who makes a sliding patio door with decent air infiltration numbers? Unfortunately, the most well-regarded offerings (Okna, Soft-lite, Sunrise, etc)...

  • Sunday July 13, 2014

    How to get a Schuco window repaired?

    Windows4U, I contacted you before I bought them. You put me in touch with FenEx since I'm in the far north suburbs of...

  • Thursday July 10, 2014

    Okna window fan review

    Just want to tell other shoppers how impressed I am with the Okna vinyl windows and Co.. Anyone looking for a excellent...

  • Thursday July 10, 2014

    Sliding Patio Door w/ Integrated Blinds

    I am considering replacing my rear patio door with a new sliding door (sliders work better for my space). I would ideally...

  • Wednesday July 9, 2014

    Okna 500 (insultec) vs United series 8000 for NJ area, Help

    :D Hi, I am trying to decide on the better window. Please can someone help.
    Install Okna 500...

  • Monday July 7, 2014

    Soooooo confused.

    I live in Naples FL and am trying to replace six windows. 4 are double hung and two are horizontal sliding windows.

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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).