Window Energy Cost
Estimate heat loss/gain and energy cost through windows
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How to Use This Calculator
Area.
U-factor.
Temp diff.
Get Loss.
Understanding Window Energy Cost Calculations
U-factor vs R-value.
Conduction.
Solar heat gain.
Infiltration.
Formula & Calculations
Area x U x dT
Key Factors to Consider
Glazing type
Frame material
Orientation
Shading
Frequently Asked Questions
1U-factor 0.30?
Good for double pane.