My questions for you professionals are so I can make an informed decision and I highly value any advice. I am not a DIYer.
My current HVAC plant which is about 20 years old uses 2 Rheem 105k oil fired furnaces, and two 2.5 ton Amana AC units. One for system for each floor of the house. My neighbor had a similar "2 of everything system" replaced by a single 5 ton Carrier Infinity heat pump and a single multi burn variable speed gas furnace, and they turned his 2 zones (up/down) into 4 zones, presumably with dampers. I am considering a similar system now that gas service is available on my street. My neighbors heat pump is Carrier's Infinity line, is supposed to be top of the line in terms of efficiency and durability. His uses a 2 stage scroll compressor. Carrier also offers the same 5 ton capacity in a unit with a 2 stage reciprocating compressor. The scroll seems to be slightly more efficient than the reciprocating, but again both are 5 ton. So the first question is: which type of compressor is best? Next question: is a hybrid system really going to pay for itself, or should I just go with a gas furnace/AC? And I guess my final question is, is my "2 of everything, one for each floor system" an antiquated system and is it wise to replace it with a big scalable system like my neighbor. And any preference on Carrier or Lennox, or any other suggestions are appreciated too.