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.


NEW: Latitude lookup by USA ZIP Code: [lookup]   [other options]   [hide]
Note: This sets the location's latitude value only, not climate data...please use the "city" menu below if possible since that sets the climate data as well.

INPUTS
LOCATION
city
latitude degrees
CLIMATE
clearness (typically 1.0)
sunshine
use clear sky
Jan % Feb % Mar % Apr %
May % Jun % Jul % Aug %
Sep % Oct % Nov % Dec %
GROUND
surface
ground reflectance (0.0 to 1.0)
WINDOW
window
SHGC (0.0 to 1.0)
orientation
OUTPUT FORMAT
units
 
  MORNING   AFTERNOON  
  4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 MONTHLY
Jan                                   Jan  
Feb                                   Feb  
Mar                                   Mar  
Apr                                   Apr  
May                                   May  
Jun                                   Jun  
Jul                                   Jul  
Aug                                   Aug  
Sep                                   Sep  
Oct                                   Oct  
Nov                                   Nov  
Dec                                   Dec  
  4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 ANNUAL
  MORNING   AFTERNOON  

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.