CHICAGO
Energy Savings % Indoor Vs. Window R/F
A/C is Off 
Excluding Summer Energy Savings
Definition of Columns in the table: 
B = Average Outdoor temperature (temperature of Window R/F's Condenser).   
C = Average Indoor temperature, 70 F or higher (temperature of Indoor R/F's Condenser). 
D = Average temperature inside the R/F (set constant at 29 F). 
Ti = C - D = Temperature difference between the Indoor R/F's evaporator and condenser. 
Tw = B - D = Temperature difference between the Window R/F's evaporator and condenser.  
G = Energy Savings % assuming that both R/Fs have the same COP (efficiency).  
G = (Ti - Tw) / Ti   Unlike Column H, it does not include the higher efficiency of  window R/F. 
H = Energy Savings % taking into account the higher COP (efficiency) of the window R/F. 
H = 1 - (Tw x Tw) / (Ti x Ti)  Unlike column G, it includes the higher efficiency of window R/F. 
Fahrenheit B C D Ti Tw G H
JAN 21 70 29 41 -8 95% 95%
FEB 25 70 29 41 -4 95% 95%
MAR 37 70 29 41 8 80% 95%
APR 49 70 29 41 20 51% 76%
MAY 59 70 29 41 30 27% 46%
JUN 69 70 29 41 40 2% 5%
JUL 73 73 29 44 44 0% 0%
AUG 72 72 29 43 43 0% 0%
SEP 64 70 29 41 35 15% 27%
OCT 53 70 29 41 24 41% 66%
NOV 40 70 29 41 11 73% 93%
DEC 27 70 29 41 -2 95% 95%
Average Energy Savings %      48% 58%
Exact same as above except in Celsius
Celsius B C D Ti Tw G H
JAN -6 21 -2 23 -4 95% 95%
FEB -4 21 -2 23 -2 95% 95%
MAR 3 21 -2 23 4 80% 95%
APR 9 21 -2 23 11 51% 76%
MAY 15 21 -2 23 17 27% 46%
JUN 21 21 -2 23 22 2% 5%
JUL 23 23 -2 24 24 0% 0%
AUG 22 22 -2 24 24 0% 0%
SEP 18 21 -2 23 19 15% 27%
OCT 12 21 -2 23 13 41% 66%
NOV 4 21 -2 23 6 73% 93%
DEC -3 21 -2 23 -1 95% 95%
Average Energy Savings %      48% 58%
Exact same as above except in Kelvin
Kelvin B C D Ti Tw G H
JAN 267 294 271 23 -4 95% 95%
FEB 269 294 271 23 -2 95% 95%
MAR 276 294 271 23 4 80% 95%
APR 282 294 271 23 11 51% 76%
MAY 288 294 271 23 17 27% 46%
JUN 294 294 271 23 22 2% 5%
JUL 296 296 271 24 24 0% 0%
AUG 295 295 271 24 24 0% 0%
SEP 291 294 271 23 19 15% 27%
OCT 285 294 271 23 13 41% 66%
NOV 277 294 271 23 6 73% 93%
DEC 270 294 271 23 -1 95% 95%
Average Energy Savings %      48% 58%
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