We turned to Exponent, Inc., the nation's leading independent scientific and engineering firm, to quantify the actual energy consumption of Hot Spring® spas through rigorous third-party testing. Exponent's technical capabilities and prestigious client list, which includes Dow Chemical, DuPont, Exxon/Mobil, General Electric, General Motors, Honeywell International and Westinghouse Electric, can be viewed at www.exponent.com. As the industry leader, we maintain only the highest testing standards in order to give you confidence that purchasing a Hot Spring spa is a powerfully efficient decision. Ambient Temperature Monthly kWh Used Monthly Cost Daily Cost 50°F 199 $16.92 56¢ 60°F 186 $15.81 53¢ 70°F 138 $11.73 39¢ Kilowatt usage based on a 115v Sovereign spa set at 102°F used six times per week, 15 minutes with the jets on and 15 minutes with the jets off during each use. Monthly and daily costs based on 8.5? per kilowatt hour. Your actual costs will vary based on your actual ambient temperature, usage, and cost per kilowatt hour. Testing conducted in a Controlled Environmental Chamber using continuous Data Acquisition monitoring equipment including Continuous Progression Kilowatt Recording Meters, Voltage Measurement probes, Current Measurement probes, Relative Humidity Chamber Measurement probes and Thermocouple probes. All equipment was rigorously calibrated to ensure data accuracy.