What is the U-Factor rating on a window?

The U-Factor is the windows ability to keep the warm air inside the home in the winter from escaping the home. Think of it like insulation in your walls. R-19 is a decent level of wall insulations for most purposes. For the ceiling, you want a higher rating like an R-30. You want a higher value of insulation to prevent heated air from escaping but, since Sacramento is in a moderate climate, a low number like a .20 or .25 is an effective number in our climate.

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