A house is maintained at 75°F in the winter by a heat pump. The house is losing heat at a rate of 60,000 Btu/h through the walls and roof. The heat pump operates on an ideal vaporcompression cycle and uses underground water at 50°F as the heat source. The working fluid is refrigerant-134a. The evaporator and condenser pressures are 50 and 120 psia, respectively. Determine the power input in horsepower to the heat pump and the electric power saved in horsepower by using a heat pump instead of an electric resistance heater.