Call us at
1-800-219-5332
Contractors Join Our Network

Window Consumer Infomation

Abcleads.com BBB Business Review   Member of NAHB

Current Board Posts

  • Monday March 2, 2015

    Good Installer in phoenix Area? Getting Sticker Shock

    I currently live in a home where basically all the windows are double paned, except for the master bedroom.
    I knew it wasn't...

  • Monday March 2, 2015

    Okna 800 and 500 Exteriors match?

    The exterior profile is only slightly different.
    If the windows are next to each other, you will notice. If not,...

  • Saturday February 28, 2015

    V-Class by Sunrise Windows

    Not necessarily differnet companies, but they do "brand" the models independantly and have different websites... It makes sense on some levels, but...

  • Wednesday February 25, 2015

    Double vs Triple in Ohio

    Settling in on my window purchase and going over the details, and I’m trying to decide on Double vs Triple pane glass.
    I...

  • Tuesday February 24, 2015

    Problem with Gorell slider door

    I am having a problem with my Gorell slider door.
    It seems that during extremely cold temperatures (-12 degrees this morning), the door...

  • Tuesday February 24, 2015

    ViWinTech windows vs. Simonton Profinish or 5500?

    I am a homeowner going through a major remodel. I've been planning on the Simonton. We are re-doing all siding and changing...

  • Friday February 20, 2015

    Choice of Windows, 2 homes

    Hi Everyone,
    I have 2 homes that require windows.
    1. 25 year old town house, eventually will sell in 1-2 years, need...

  • Thursday February 19, 2015

    Seeking advise for mid range windows selection in North East

    Hello everyone!
    I'm about to ask what I'm sure is a very difficult and murky question: What are the best brands / models...

  • Sunday February 15, 2015

    Burris in Houston, how are they value for money

    Any comment Burris AC single hung in Houston for about $8K with 366 glass. Should we keep looking, any other windows with better...

  • Sunday February 15, 2015

    Okna vs Sunrise

    We have been quoted both Starmark (Okna)with krypton gas and Sunrise w/ultra plus and Apex (in bathroom) with argon gas. They both seem...

1 of 10

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).