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1. Calculate how long it will take for the more efficient unit to save enough energy to offset its original installation cost under the following conditions? EER 12 EER 16 - 4 tons - 4tons - $4,000 installation cost - $5,500 installation cost - $0.08/Kw - $0.08/Kw - 2,000 hours of operation/yr - 2,000 hours of operation/yr a) Figure operating watts used/hour. b) Figure KW c) Figure hourly operating cost. d) Figure yearly cost. e) Figure yearly energy savings between units. f) Figure installation cost difference. g) Figure Break Even