An air conditioner on a hot summer day removes 8 kW of energy from a house at 21◦C and pushes energy to the outside, which is at 31◦C. The house has a mass of 15 000 kg with an average specific heat of 0.95 kJ/kgK. In order to do this, the cold side of the air conditioner is at 5◦C and the hot side is at 40◦C. The air conditioner (refrigerator) has a COP that is 60% that of a corresponding Carnot refrigerator. Find the actual COP of the air conditioner and the power required to run it.