Window Heat Gain

This tool calculates the solar heat gain through vertical windows in temperate latitudes. Please read the important instructions, notes, and FAQ pages before using this tool.

INPUTS
LOCATION
city	Custom data Phoenix, AZ Los Angeles, CA Miami, FL Atlanta, GA Boston, MA Duluth, MN Seattle, WA Madison, WI
latitude	degrees North
clearness	Jan % Apr % Jul % Oct % Feb % May % Aug % Nov % Mar % Jun % Sep % Dec %
GROUND
surface	Custom data new concrete old concrete bright green grass crushed rock bitumen and gravel roof bituminous parking lot default or unknown surface
ground reflectance	(0.0 to 1.0)
WINDOW
window	Custom data single-glazed clear (aluminum) single-glazed bronze (aluminum) double-glazed clear (aluminum) double-glazed bronze (aluminum) double-glazed clear (wood/vinyl) double-glazed bronze (wood/vinyl) double-glazed low-E 0.20 (wood/vinyl) double-glazed low-E 0.08 (wood/vinyl) double-glazed spectrally-sensitive 0.04 (wood/vinyl) double-glazed spectrally-sensitive 0.10 (wood/vinyl) triple-glazed low-E superwindow 0.08x2 (insul. vinyl) triple-glazed clear (wood/vinyl)
SHGC	(0.0 to 1.0)
orientation	North East South West
OUTPUT FORMAT
units	W-hr / m2 / day W-hr / m2 / month Btu / ft2 / day Btu / ft2 / month
labels	Include month labels and footer info

Support Window Heat Gain!

The development and maintenance of Window Heat Gain is supported 100% by voluntary user donations. If you found this program helpful, please consider making a small donation...this can be done quickly and securely by credit card, or you can mail a check. Suggested donations are $25 for commercial use, and $10 for personal use. Please visit the Shareware page for details, or you can make a quick PayPal or credit card donation to the right. Thanks!

QUICK DONATION Commercial ($25) Personal ($10)

Mailing List

The author maintains a private mailing list of users of SunAngle and his other shareware solar design tools, and is happy to send you very occasional notices about software upgrades and other items of interest. Such notices do not occur more frequently than a few times a year.

If you're interested in joining the SunAngle mailing list, please send e-mail to the author with this request. Your e-mail address will never be used for commercial purposes or given to anyone else for any reason.