Many changes have been made in window and window glazing technology that have increased the weather-tightness, improved the ease of use and maintenance, reduced solar heat gain and limited heat loss. Initially such improvements were only found in the windows added in newer homes.  Now, however, according to the HouseMaster Technical Staff, there is a substantial replacement window market. Consequently, owners of older homes can also benefit from the new technology.

Considerations
One of the primary improvements in window glazing has been the use of double or triple pane glass units that are constructed with dead air space between the panes. This construction reduces the amount of heat loss through the window. Unfortunately, the integrity of these "sealed" airtight window units is subject to failure due to improper installation or manufacturing defects or as a result of other factors that occur after installation. When they fail, moisture may infiltrate and condense on the inner surfaces, ultimately staining the window. This condition does not substantially affect the thermal benefits, but may become an aesthetic issue requiring eventual replacement on a discretionary basis.

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