Reno
Energy Savings % Indoor Vs. Window R/F
Assuming that the A/C is Off (Outdoor is colder than kitchen)
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 of the evaporator (set constant at 29 F). 
Energy Savings % = H = (C-B) / (C-D)
Fahrenheit B C D H
JAN 33 70 29 90%
FEB 38 70 29 78%
MAR 43 70 29 66%
APR 49 70 29 51%
MAY 57 70 29 32%
JUN 65 70 29 12%
JUL 72 72 29 0%
AUG 70 70 29 0%
SEP 60 70 29 24%
OCT 51 70 29 46%
NOV 40 70 29 73%
DEC 33 70 29 90%
Average Energy Savings %  47%
Exact same as above except in Celsius
Celsius B C D H
JAN 1 21 -2 90%
FEB 3 21 -2 78%
MAR 6 21 -2 66%
APR 9 21 -2 51%
MAY 14 21 -2 32%
JUN 18 21 -2 12%
JUL 22 22 -2 0%
AUG 21 21 -2 0%
SEP 16 21 -2 24%
OCT 11 21 -2 46%
NOV 4 21 -2 73%
DEC 1 21 -2 90%
Average Energy Savings %  47%
Windowrefrigerator.com
PATENT PENDING