The best way to be energy efficient is to have and work with the right appliances in order to be sustainable. According to my research, there are hot tubs that provide a way to save energy according to its R-Value. In order to monitor the efficiency of the energy consumption Power Cost Monitor is a tool that could be used in order to know which appliances, lighting fixtures, as many other applianes could be the reason of making the electrical bill rise. For this reason, it is important to know which appliances to use in order to be the most sustainable as possible.
Spa Depot. (1997). Retrieved August 29, 2011, from SpaCyclopedia: http://www.spadepot.com/spacyclopedia/energy-conservation.htm