So...what are the bet replacement windows? How to measure one against another?

The truth is, replacement windows are just like any other product out on the market. You will have pockets from all over each arguing why replacement window A is better than replacement window B.

Assuming that each window is installed by a seasoned professional installer, the 3 main differences that distinguish one window from another is the energy efficiency, the ease of operation, and aesthetics.

1. Energy Efficiency

The energy efficiency of a window is determined by:

1.  The # of panes of glass, either double pane or triple pane

2.  The type of gas in between the glass, Argon gas or Krypton gas

3.  The thickness of the panes of glass

4.  THe thickness of the vinyl walls that make up the chambers in the window frame

Fortunately, you don't have to analyze each for yourself.  The NFRC, the National Fenestartion Ratings Coucil, has done all this research on most all major brands of windows that are offered to homeowners.

The factors listed above are quantfied into what's known as the U-Factor, and the Solar Heat Gain Co-efficient.  The U-Factor is the measurement of how much energy (hot or cold), transfers through the windows, whether it's inside out, or outside in.  The Solar Heat Gain Co-efficient, is the measure of how much light passes through the window, compared to how much light is actually hitting the window.  In other words, how much sun light does the window allow in.

Whichever window has a low U-Value and SHGC value, most likely the more expensive it is, and the better peformer it will be.

2.  Window Aesthetics

 To be discussed in the next article...