I am considering installing a Carrier Infinity dual fuel system in my house. A three ton heat pump should be sufficient for cooling capacity, but I see that the coil size changes the output significantly. With the 25HNA6 heat pump and the CNPH*3617A** coil I would get 33400 BTU/Hr, with the CNPH*4821A** coil I would get 34600 BTU/Hr. The EER, SEER,COP, & HSPF all increase with the larger coil. Other than size, is there any drawback to using the larger coil? This would be matched with a 58MUV-60-14 furnace. Also, would anyone recommend going to the 25HNA9 heat pump for its higher efficiency and scroll compressor?