City	Constant Water Temperature	Daily kw of Heat/Day	Operating Cost/Day	Operating Cost/Month
Atlanta	104º	3.6	36¢	$10.80
Boston	104º	4.9	49¢	$14.70
Chicago	104º	4.4	44¢	$13.20
Denver	104º	4.5	45¢	$13.50
Los Angeles	104º	2.3	23¢	$6.90
Philadelphia	104º	4.3	43¢	$12.90
St. Louis	104º	4.3	43¢	$12.90
Seattle	104º	4.2	42¢	$12.60
Washington	104º	4.2	42¢	$12.60

Cost based on 10¢ per kw/hr relative to normal temperatures of the above-mentioned cities. Frequency of use and location of spa are variables that will affect cost.