Bombay
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 75 75 29 46 46 0% 0%
FEB 77 77 29 48 48 0% 0%
MAR 81 81 29 52 52 0% 0%
APR 83 83 29 54 54 0% 0%
MAY 85 85 29 56 56 0% 0%
JUN 84 84 29 55 55 0% 0%
JUL 82 82 29 53 53 0% 0%
AUG 82 82 29 53 53 0% 0%
SEP 82 82 29 53 53 0% 0%
OCT 83 83 29 54 54 0% 0%
NOV 81 81 29 52 52 0% 0%
DEC 77 77 29 48 48 0% 0%
Average Energy Savings %      0% 0%
Exact same as above except in Celsius
Celsius B C D Ti Tw G H
JAN 24 24 -2 26 26 0% 0%
FEB 25 25 -2 27 27 0% 0%
MAR 27 27 -2 29 29 0% 0%
APR 28 28 -2 30 30 0% 0%
MAY 29 29 -2 31 31 0% 0%
JUN 29 29 -2 31 31 0% 0%
JUL 28 28 -2 29 29 0% 0%
AUG 28 28 -2 29 29 0% 0%
SEP 28 28 -2 29 29 0% 0%
OCT 28 28 -2 30 30 0% 0%
NOV 27 27 -2 29 29 0% 0%
DEC 25 25 -2 27 27 0% 0%
Average Energy Savings %      0% 0%
Exact same as above except in Kelvin
Kelvin B C D Ti Tw G H
JAN 297 297 271 26 26 0% 0%
FEB 298 298 271 27 27 0% 0%
MAR 300 300 271 29 29 0% 0%
APR 301 301 271 30 30 0% 0%
MAY 302 302 271 31 31 0% 0%
JUN 302 302 271 31 31 0% 0%
JUL 301 301 271 29 29 0% 0%
AUG 301 301 271 29 29 0% 0%
SEP 301 301 271 29 29 0% 0%
OCT 301 301 271 30 30 0% 0%
NOV 300 300 271 29 29 0% 0%
DEC 298 298 271 27 27 0% 0%
Average Energy Savings %      0% 0%
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