Not sure if I am doing this correct and do not have answer available... A heat pump takes on 30,000BTU/hr of heat and uses 5030 watts. However its COP as an air conditioner is 2.19. How efficient is the pump and motor setup? I am assuming the following: Qh=30000 BTU/hr=11.79 hp WKin=5030 W=5.03kW/0.746kW=6.74 hp * 2545 BTU/hr = 17,153 BTU/hr COPhp= Qh/WKin=11.79/6.74= 1.75 So is that the efficiency or should I solve for Qc as such: Qc= Qh - WKin= 30000 BTU/hr - 17153 BTU/hr= 12,847 BTU/hr And then use Carnot's efficiency equation? But Qc or Qh are rates and not Th or Tl...any help would be appreciated.