U-VALUE

Just as insulation has its R-factor, windows have a U-value. It is a measurement of the window's ability to insulate. It is dependent on the layers of glass, the material from which the frame is constructed, the type of gas between the panes of glass, tints, glazing, etc. Unlike the R-factor, a LOWER U-value means better insulation ability for the window.

Why can't the people who conjure up these factors and values be consistent? Is it asking too much? Either better insulation should always be a higher number or always a lower number.

The maximum U-value required for a space is dependent on a variety of factors, including the size of a window opening, the square footage of space within a room, the thickness of insulation, the thickness of drapes and how many medieval tapestries hang on the walls. The B-B PUD will provide you with a worksheet that will help to calculate all this. When you have gathered your figures and receipts, take the form to H & R Block and have them calculate your U-value. While you're there, you may as well get your taxes done.

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